{"countries":[{"id":4,"name":"Afghanistan","region_id":1},{"id":17,"name":"Åland Islands","region_id":1},{"id":7,"name":"Albania","region_id":1},{"id":64,"name":"Algeria","region_id":1},{"id":13,"name":"American Samoa","region_id":3},{"id":2,"name":"Andorra","region_id":1},{"id":10,"name":"Angola","region_id":1},{"id":6,"name":"Anguilla","region_id":1},{"id":11,"name":"Antarctica","region_id":1},{"id":5,"name":"Antigua and Barbuda","region_id":1},{"id":12,"name":"Argentina","region_id":1},{"id":8,"name":"Armenia","region_id":1},{"id":16,"name":"Aruba","region_id":1},{"id":15,"name":"Australia","region_id":2},{"id":14,"name":"Austria","region_id":1},{"id":18,"name":"Azerbaijan","region_id":1},{"id":34,"name":"Bahamas","region_id":1},{"id":25,"name":"Bahrain","region_id":1},{"id":21,"name":"Bangladesh","region_id":1},{"id":20,"name":"Barbados","region_id":1},{"id":38,"name":"Belarus","region_id":1},{"id":22,"name":"Belgium","region_id":1},{"id":39,"name":"Belize","region_id":1},{"id":27,"name":"Benin","region_id":1},{"id":29,"name":"Bermuda","region_id":1},{"id":35,"name":"Bhutan","region_id":1},{"id":31,"name":"Bolivia","region_id":1},{"id":32,"name":"Bonaire, Sint Eustatius and Saba","region_id":1},{"id":19,"name":"Bosnia and Herzegovina","region_id":1},{"id":37,"name":"Botswana","region_id":1},{"id":36,"name":"Bouvet Island","region_id":1},{"id":33,"name":"Brazil","region_id":1},{"id":108,"name":"British Indian Ocean Territory","region_id":1},{"id":30,"name":"Brunei Darussalam","region_id":1},{"id":24,"name":"Bulgaria","region_id":1},{"id":23,"name":"Burkina Faso","region_id":1},{"id":26,"name":"Burundi","region_id":1},{"id":119,"name":"Cambodia","region_id":1},{"id":49,"name":"Cameroon","region_id":1},{"id":40,"name":"Canada","region_id":1},{"id":54,"name":"Cape Verde","region_id":1},{"id":126,"name":"Cayman Islands","region_id":1},{"id":43,"name":"Central African Republic","region_id":1},{"id":217,"name":"Chad","region_id":1},{"id":48,"name":"Chile","region_id":1},{"id":50,"name":"China","region_id":1},{"id":56,"name":"Christmas Island","region_id":1},{"id":41,"name":"Cocos (Keeling) Islands","region_id":1},{"id":51,"name":"Colombia","region_id":1},{"id":121,"name":"Comoros","region_id":1},{"id":44,"name":"Congo","region_id":1},{"id":42,"name":"Congo, The Democratic Republic Of The","region_id":1},{"id":47,"name":"Cook Islands","region_id":1},{"id":52,"name":"Costa Rica","region_id":1},{"id":46,"name":"Côte D'Ivoire","region_id":1},{"id":100,"name":"Croatia","region_id":1},{"id":53,"name":"Cuba","region_id":1},{"id":55,"name":"Curaçao","region_id":1},{"id":57,"name":"Cyprus","region_id":1},{"id":58,"name":"Czech Republic","region_id":1},{"id":61,"name":"Denmark","region_id":1},{"id":60,"name":"Djibouti","region_id":1},{"id":62,"name":"Dominica","region_id":1},{"id":63,"name":"Dominican Republic","region_id":1},{"id":65,"name":"Ecuador","region_id":1},{"id":67,"name":"Egypt","region_id":1},{"id":212,"name":"El Salvador","region_id":1},{"id":90,"name":"Equatorial Guinea","region_id":1},{"id":69,"name":"Eritrea","region_id":1},{"id":66,"name":"Estonia","region_id":1},{"id":71,"name":"Ethiopia","region_id":1},{"id":74,"name":"Falkland Islands (Malvinas)","region_id":1},{"id":76,"name":"Faroe Islands","region_id":1},{"id":73,"name":"Fiji","region_id":1},{"id":72,"name":"Finland","region_id":1},{"id":77,"name":"France","region_id":1},{"id":82,"name":"French Guiana","region_id":1},{"id":177,"name":"French Polynesia","region_id":1},{"id":218,"name":"French Southern Territories","region_id":1},{"id":78,"name":"Gabon","region_id":1},{"id":87,"name":"Gambia","region_id":1},{"id":81,"name":"Georgia","region_id":1},{"id":59,"name":"Germany","region_id":1},{"id":84,"name":"Ghana","region_id":1},{"id":85,"name":"Gibraltar","region_id":1},{"id":91,"name":"Greece","region_id":1},{"id":86,"name":"Greenland","region_id":1},{"id":80,"name":"Grenada","region_id":1},{"id":89,"name":"Guadeloupe","region_id":1},{"id":94,"name":"Guam","region_id":1},{"id":93,"name":"Guatemala","region_id":1},{"id":83,"name":"Guernsey","region_id":1},{"id":88,"name":"Guinea","region_id":1},{"id":95,"name":"Guinea-Bissau","region_id":1},{"id":96,"name":"Guyana","region_id":1},{"id":101,"name":"Haiti","region_id":1},{"id":98,"name":"Heard and McDonald Islands","region_id":1},{"id":238,"name":"Holy See (Vatican City State)","region_id":1},{"id":99,"name":"Honduras","region_id":1},{"id":97,"name":"Hong Kong","region_id":1},{"id":102,"name":"Hungary","region_id":1},{"id":111,"name":"Iceland","region_id":1},{"id":107,"name":"India","region_id":1},{"id":103,"name":"Indonesia","region_id":1},{"id":110,"name":"Iran, Islamic Republic Of","region_id":1},{"id":109,"name":"Iraq","region_id":1},{"id":104,"name":"Ireland","region_id":1},{"id":106,"name":"Isle of Man","region_id":1},{"id":105,"name":"Israel","region_id":1},{"id":112,"name":"Italy","region_id":1},{"id":114,"name":"Jamaica","region_id":1},{"id":116,"name":"Japan","region_id":1},{"id":113,"name":"Jersey","region_id":1},{"id":115,"name":"Jordan","region_id":1},{"id":127,"name":"Kazakhstan","region_id":1},{"id":117,"name":"Kenya","region_id":1},{"id":120,"name":"Kiribati","region_id":1},{"id":123,"name":"Korea, Democratic People's Republic Of","region_id":1},{"id":124,"name":"Korea, Republic of","region_id":1},{"id":252,"name":"Kosovo","region_id":1},{"id":125,"name":"Kuwait","region_id":1},{"id":118,"name":"Kyrgyzstan","region_id":1},{"id":128,"name":"Lao People's Democratic Republic","region_id":1},{"id":137,"name":"Latvia","region_id":1},{"id":129,"name":"Lebanon","region_id":1},{"id":134,"name":"Lesotho","region_id":1},{"id":133,"name":"Liberia","region_id":1},{"id":138,"name":"Libya","region_id":1},{"id":131,"name":"Liechtenstein","region_id":1},{"id":135,"name":"Lithuania","region_id":1},{"id":136,"name":"Luxembourg","region_id":1},{"id":150,"name":"Macao","region_id":1},{"id":146,"name":"Macedonia, the Former Yugoslav Republic Of","region_id":1},{"id":144,"name":"Madagascar","region_id":1},{"id":158,"name":"Malawi","region_id":1},{"id":160,"name":"Malaysia","region_id":1},{"id":157,"name":"Maldives","region_id":1},{"id":147,"name":"Mali","region_id":1},{"id":155,"name":"Malta","region_id":1},{"id":145,"name":"Marshall Islands","region_id":1},{"id":152,"name":"Martinique","region_id":1},{"id":153,"name":"Mauritania","region_id":1},{"id":156,"name":"Mauritius","region_id":1},{"id":248,"name":"Mayotte","region_id":1},{"id":159,"name":"Mexico","region_id":1},{"id":75,"name":"Micronesia, Federated States Of","region_id":1},{"id":141,"name":"Moldova, Republic of","region_id":1},{"id":140,"name":"Monaco","region_id":1},{"id":149,"name":"Mongolia","region_id":1},{"id":142,"name":"Montenegro","region_id":1},{"id":154,"name":"Montserrat","region_id":1},{"id":139,"name":"Morocco","region_id":1},{"id":161,"name":"Mozambique","region_id":1},{"id":148,"name":"Myanmar","region_id":1},{"id":162,"name":"Namibia","region_id":1},{"id":171,"name":"Nauru","region_id":1},{"id":170,"name":"Nepal","region_id":1},{"id":168,"name":"Netherlands","region_id":1},{"id":9,"name":"Netherlands Antilles","region_id":1},{"id":163,"name":"New Caledonia","region_id":1},{"id":173,"name":"New Zealand","region_id":2},{"id":167,"name":"Nicaragua","region_id":1},{"id":164,"name":"Niger","region_id":1},{"id":166,"name":"Nigeria","region_id":1},{"id":172,"name":"Niue","region_id":1},{"id":165,"name":"Norfolk Island","region_id":1},{"id":151,"name":"Northern Mariana Islands","region_id":1},{"id":169,"name":"Norway","region_id":1},{"id":174,"name":"Oman","region_id":1},{"id":180,"name":"Pakistan","region_id":1},{"id":187,"name":"Palau","region_id":1},{"id":185,"name":"Palestine, State of","region_id":1},{"id":175,"name":"Panama","region_id":1},{"id":178,"name":"Papua New Guinea","region_id":1},{"id":188,"name":"Paraguay","region_id":1},{"id":176,"name":"Peru","region_id":1},{"id":179,"name":"Philippines","region_id":1},{"id":183,"name":"Pitcairn","region_id":1},{"id":181,"name":"Poland","region_id":1},{"id":186,"name":"Portugal","region_id":1},{"id":184,"name":"Puerto Rico","region_id":1},{"id":189,"name":"Qatar","region_id":1},{"id":190,"name":"Réunion","region_id":1},{"id":191,"name":"Romania","region_id":1},{"id":193,"name":"Russian Federation","region_id":1},{"id":194,"name":"Rwanda","region_id":1},{"id":28,"name":"Saint Barthélemy","region_id":1},{"id":201,"name":"Saint Helena","region_id":1},{"id":122,"name":"Saint Kitts And Nevis","region_id":1},{"id":130,"name":"Saint Lucia","region_id":1},{"id":143,"name":"Saint Martin","region_id":1},{"id":182,"name":"Saint Pierre And Miquelon","region_id":1},{"id":239,"name":"Saint Vincent And The Grenadines","region_id":1},{"id":246,"name":"Samoa","region_id":1},{"id":206,"name":"San Marino","region_id":1},{"id":211,"name":"Sao Tome and Principe","region_id":1},{"id":195,"name":"Saudi Arabia","region_id":1},{"id":207,"name":"Senegal","region_id":1},{"id":192,"name":"Serbia","region_id":1},{"id":197,"name":"Seychelles","region_id":1},{"id":205,"name":"Sierra Leone","region_id":1},{"id":200,"name":"Singapore","region_id":1},{"id":213,"name":"Sint Maarten","region_id":1},{"id":204,"name":"Slovakia","region_id":1},{"id":202,"name":"Slovenia","region_id":1},{"id":196,"name":"Solomon Islands","region_id":1},{"id":208,"name":"Somalia","region_id":1},{"id":249,"name":"South Africa","region_id":1},{"id":92,"name":"South Georgia and the South Sandwich Islands","region_id":1},{"id":210,"name":"South Sudan","region_id":1},{"id":70,"name":"Spain","region_id":1},{"id":132,"name":"Sri Lanka","region_id":1},{"id":198,"name":"Sudan","region_id":1},{"id":209,"name":"Suriname","region_id":1},{"id":203,"name":"Svalbard And Jan Mayen","region_id":1},{"id":215,"name":"Swaziland","region_id":1},{"id":199,"name":"Sweden","region_id":1},{"id":45,"name":"Switzerland","region_id":1},{"id":214,"name":"Syrian Arab Republic","region_id":1},{"id":230,"name":"Taiwan, Republic Of China","region_id":1},{"id":221,"name":"Tajikistan","region_id":1},{"id":231,"name":"Tanzania, United Republic of","region_id":1},{"id":220,"name":"Thailand","region_id":1},{"id":223,"name":"Timor-Leste","region_id":1},{"id":219,"name":"Togo","region_id":1},{"id":222,"name":"Tokelau","region_id":1},{"id":226,"name":"Tonga","region_id":1},{"id":228,"name":"Trinidad and Tobago","region_id":1},{"id":225,"name":"Tunisia","region_id":1},{"id":227,"name":"Turkey","region_id":1},{"id":224,"name":"Turkmenistan","region_id":1},{"id":216,"name":"Turks and Caicos Islands","region_id":1},{"id":229,"name":"Tuvalu","region_id":1},{"id":233,"name":"Uganda","region_id":1},{"id":232,"name":"Ukraine","region_id":1},{"id":3,"name":"United Arab Emirates","region_id":1},{"id":79,"name":"United Kingdom","region_id":4},{"id":235,"name":"United States","region_id":3},{"id":234,"name":"United States Minor Outlying Islands","region_id":3},{"id":236,"name":"Uruguay","region_id":1},{"id":237,"name":"Uzbekistan","region_id":1},{"id":244,"name":"Vanuatu","region_id":1},{"id":240,"name":"Venezuela, Bolivarian Republic of","region_id":1},{"id":243,"name":"Vietnam","region_id":1},{"id":241,"name":"Virgin Islands, British","region_id":1},{"id":242,"name":"Virgin Islands, U.S.","region_id":1},{"id":245,"name":"Wallis and Futuna","region_id":1},{"id":68,"name":"Western Sahara","region_id":1},{"id":247,"name":"Yemen","region_id":1},{"id":250,"name":"Zambia","region_id":1},{"id":251,"name":"Zimbabwe","region_id":1}],"sub_specialties":{"en":[{"broad_division_id":1,"groupId":"Radiology","label":"General radiology","value":1},{"broad_division_id":1,"groupId":"Radiology","label":"Abdominal radiology","value":2},{"broad_division_id":1,"groupId":"Radiology","label":"Breast radiology","value":3},{"broad_division_id":1,"groupId":"Radiology","label":"Cardiac radiology","value":97},{"broad_division_id":1,"groupId":"Radiology","label":"Chest radiology","value":4},{"broad_division_id":1,"groupId":"Radiology","label":"Emergency radiology","value":98},{"broad_division_id":1,"groupId":"Radiology","label":"Head and neck radiology","value":99},{"broad_division_id":1,"groupId":"Radiology","label":"Interventional radiology","value":5},{"broad_division_id":1,"groupId":"Radiology","label":"Musculoskeletal radiology","value":6},{"broad_division_id":1,"groupId":"Radiology","label":"Neurointerventional radiology","value":7},{"broad_division_id":1,"groupId":"Radiology","label":"Neuroradiology","value":8},{"broad_division_id":1,"groupId":"Radiology","label":"Nuclear medicine","value":9},{"broad_division_id":1,"groupId":"Radiology","label":"Paediatric radiology","value":10},{"broad_division_id":1,"groupId":"Radiology","label":"Vascular radiology","value":100},{"broad_division_id":1,"groupId":"Radiology","label":"Women's imaging","value":11},{"broad_division_id":1,"groupId":"Radiology","label":"Other radiology","value":12},{"broad_division_id":1,"groupId":"Pathology","label":"General pathology","value":13},{"broad_division_id":1,"groupId":"Pathology","label":"Anatomical pathology","value":14},{"broad_division_id":1,"groupId":"Pathology","label":"Chemical pathology","value":15},{"broad_division_id":1,"groupId":"Pathology","label":"Forensic pathology","value":16},{"broad_division_id":1,"groupId":"Pathology","label":"Haematology","value":17},{"broad_division_id":1,"groupId":"Pathology","label":"Other pathology","value":18},{"broad_division_id":1,"groupId":"Physician","label":"General medicine","value":19},{"broad_division_id":1,"groupId":"Physician","label":"Cardiology","value":20},{"broad_division_id":1,"groupId":"Physician","label":"Dermatology","value":21},{"broad_division_id":1,"groupId":"Physician","label":"Emergency medicine","value":22},{"broad_division_id":1,"groupId":"Physician","label":"Endocrinology","value":23},{"broad_division_id":1,"groupId":"Physician","label":"Gastroenterology","value":24},{"broad_division_id":1,"groupId":"Physician","label":"Geriatrician","value":25},{"broad_division_id":1,"groupId":"Physician","label":"Haematology","value":26},{"broad_division_id":1,"groupId":"Physician","label":"Immunology","value":27},{"broad_division_id":1,"groupId":"Physician","label":"Infectious diseases","value":28},{"broad_division_id":1,"groupId":"Physician","label":"Intensive care","value":29},{"broad_division_id":1,"groupId":"Physician","label":"Internal medicine","value":30},{"broad_division_id":1,"groupId":"Physician","label":"Palliative care","value":31},{"broad_division_id":1,"groupId":"Physician","label":"Neonatalology","value":32},{"broad_division_id":1,"groupId":"Physician","label":"Nephrology","value":33},{"broad_division_id":1,"groupId":"Physician","label":"Neurology","value":34},{"broad_division_id":1,"groupId":"Physician","label":"Obstetrics and/or gynaecology","value":35},{"broad_division_id":1,"groupId":"Physician","label":"Oncology","value":36},{"broad_division_id":1,"groupId":"Physician","label":"Ophthalmology","value":37},{"broad_division_id":1,"groupId":"Physician","label":"Pain management","value":38},{"broad_division_id":1,"groupId":"Physician","label":"Paediatrics","value":39},{"broad_division_id":1,"groupId":"Physician","label":"Psychiatry","value":40},{"broad_division_id":1,"groupId":"Physician","label":"Radiation oncology","value":41},{"broad_division_id":1,"groupId":"Physician","label":"Rehabilitation medicine","value":42},{"broad_division_id":1,"groupId":"Physician","label":"Respiratory medicine","value":43},{"broad_division_id":1,"groupId":"Physician","label":"Rheumatology","value":44},{"broad_division_id":1,"groupId":"Physician","label":"Other specialised medicine","value":45},{"broad_division_id":1,"groupId":"Surgery","label":"General surgeon","value":46},{"broad_division_id":1,"groupId":"Surgery","label":"Cardiothoracic surgeon","value":47},{"broad_division_id":1,"groupId":"Surgery","label":"Colorectal surgeon","value":48},{"broad_division_id":1,"groupId":"Surgery","label":"Ear nose and throat surgeon","value":49},{"broad_division_id":1,"groupId":"Surgery","label":"Head and neck surgeon","value":50},{"broad_division_id":1,"groupId":"Surgery","label":"Hepatobiliary surgeon","value":51},{"broad_division_id":1,"groupId":"Surgery","label":"Maxillofacial surgeon","value":52},{"broad_division_id":1,"groupId":"Surgery","label":"Neurosurgeon","value":53},{"broad_division_id":1,"groupId":"Surgery","label":"Oncological surgeon","value":54},{"broad_division_id":1,"groupId":"Surgery","label":"Orthopaedic surgeon","value":55},{"broad_division_id":1,"groupId":"Surgery","label":"Plastic surgeon","value":56},{"broad_division_id":1,"groupId":"Surgery","label":"Trauma surgeon","value":57},{"broad_division_id":1,"groupId":"Surgery","label":"Urology","value":58},{"broad_division_id":1,"groupId":"Surgery","label":"Vascular surgeon","value":59},{"broad_division_id":1,"groupId":"Surgery","label":"Other surgeon","value":60},{"broad_division_id":1,"groupId":"Anaesthetics","label":"Anaesthetics","value":61},{"broad_division_id":1,"groupId":"Other medical doctor","label":"Other medical doctor","value":62},{"broad_division_id":2,"groupId":"Imaging technologist","label":"General radiography","value":63},{"broad_division_id":2,"groupId":"Imaging technologist","label":"Angiography","value":64},{"broad_division_id":2,"groupId":"Imaging technologist","label":"CT radiography","value":65},{"broad_division_id":2,"groupId":"Imaging technologist","label":"MR imaging","value":66},{"broad_division_id":2,"groupId":"Imaging technologist","label":"Nuclear medicine","value":67},{"broad_division_id":2,"groupId":"Imaging technologist","label":"Radiation therapy","value":68},{"broad_division_id":2,"groupId":"Imaging technologist","label":"Radiology technician","value":69},{"broad_division_id":2,"groupId":"Imaging technologist","label":"Ultrasonography","value":70},{"broad_division_id":2,"groupId":"Imaging technologist","label":"Other imaging technologist","value":71},{"broad_division_id":3,"groupId":"Dentistry/dental science","label":"General dentistry","value":72},{"broad_division_id":3,"groupId":"Dentistry/dental science","label":"Endodontistry","value":73},{"broad_division_id":3,"groupId":"Dentistry/dental science","label":"Paediatric dentistry","value":74},{"broad_division_id":3,"groupId":"Dentistry/dental science","label":"Pedodontistry","value":75},{"broad_division_id":3,"groupId":"Dentistry/dental science","label":"Periodontistry","value":76},{"broad_division_id":3,"groupId":"Dentistry/dental science","label":"Prosthodontistry","value":77},{"broad_division_id":3,"groupId":"Dentistry/dental science","label":"Oral and maxillofacial surgery","value":78},{"broad_division_id":3,"groupId":"Dentistry/dental science","label":"Oral pathology","value":79},{"broad_division_id":3,"groupId":"Dentistry/dental science","label":"Orthodontistry","value":80},{"broad_division_id":3,"groupId":"Dentistry/dental science","label":"Other dentistry","value":81},{"broad_division_id":4,"groupId":"Nursing","label":"General nursing","value":82},{"broad_division_id":4,"groupId":"Nursing","label":"Anaesthetic nursing","value":83},{"broad_division_id":4,"groupId":"Nursing","label":"Dental nursing","value":84},{"broad_division_id":4,"groupId":"Nursing","label":"Emergency nursing","value":85},{"broad_division_id":4,"groupId":"Nursing","label":"Intensive care nursing","value":86},{"broad_division_id":4,"groupId":"Nursing","label":"Medical nursing","value":87},{"broad_division_id":4,"groupId":"Nursing","label":"Paediatric nursing","value":88},{"broad_division_id":4,"groupId":"Nursing","label":"Rehabilitation nursing","value":89},{"broad_division_id":4,"groupId":"Nursing","label":"Surgical nursing","value":90},{"broad_division_id":4,"groupId":"Nursing","label":"Other nursing","value":91},{"broad_division_id":5,"groupId":"Allied health","label":"Dietician","value":92},{"broad_division_id":5,"groupId":"Allied health","label":"Occupational therapy","value":93},{"broad_division_id":5,"groupId":"Allied health","label":"Physiotherapy","value":94},{"broad_division_id":5,"groupId":"Allied health","label":"Speech pathology","value":95},{"broad_division_id":5,"groupId":"Allied health","label":"Other allied health","value":96}],"en-US":[{"broad_division_id":1,"groupId":"Radiology","label":"General radiology","value":1},{"broad_division_id":1,"groupId":"Radiology","label":"Abdominal radiology","value":2},{"broad_division_id":1,"groupId":"Radiology","label":"Breast radiology","value":3},{"broad_division_id":1,"groupId":"Radiology","label":"Cardiac radiology","value":97},{"broad_division_id":1,"groupId":"Radiology","label":"Chest radiology","value":4},{"broad_division_id":1,"groupId":"Radiology","label":"Emergency radiology","value":98},{"broad_division_id":1,"groupId":"Radiology","label":"Head and neck radiology","value":99},{"broad_division_id":1,"groupId":"Radiology","label":"Interventional radiology","value":5},{"broad_division_id":1,"groupId":"Radiology","label":"Musculoskeletal radiology","value":6},{"broad_division_id":1,"groupId":"Radiology","label":"Neurointerventional radiology","value":7},{"broad_division_id":1,"groupId":"Radiology","label":"Neuroradiology","value":8},{"broad_division_id":1,"groupId":"Radiology","label":"Nuclear medicine","value":9},{"broad_division_id":1,"groupId":"Radiology","label":"Pediatric radiology","value":10},{"broad_division_id":1,"groupId":"Radiology","label":"Vascular radiology","value":100},{"broad_division_id":1,"groupId":"Radiology","label":"Women's imaging","value":11},{"broad_division_id":1,"groupId":"Radiology","label":"Other radiology","value":12},{"broad_division_id":1,"groupId":"Pathology","label":"General pathology","value":13},{"broad_division_id":1,"groupId":"Pathology","label":"Anatomical pathology","value":14},{"broad_division_id":1,"groupId":"Pathology","label":"Chemical pathology","value":15},{"broad_division_id":1,"groupId":"Pathology","label":"Forensic pathology","value":16},{"broad_division_id":1,"groupId":"Pathology","label":"Hematology","value":17},{"broad_division_id":1,"groupId":"Pathology","label":"Other pathology","value":18},{"broad_division_id":1,"groupId":"Physician","label":"General medicine","value":19},{"broad_division_id":1,"groupId":"Physician","label":"Cardiology","value":20},{"broad_division_id":1,"groupId":"Physician","label":"Dermatology","value":21},{"broad_division_id":1,"groupId":"Physician","label":"Emergency medicine","value":22},{"broad_division_id":1,"groupId":"Physician","label":"Endocrinology","value":23},{"broad_division_id":1,"groupId":"Physician","label":"Gastroenterology","value":24},{"broad_division_id":1,"groupId":"Physician","label":"Geriatrician","value":25},{"broad_division_id":1,"groupId":"Physician","label":"Hematology","value":26},{"broad_division_id":1,"groupId":"Physician","label":"Immunology","value":27},{"broad_division_id":1,"groupId":"Physician","label":"Infectious diseases","value":28},{"broad_division_id":1,"groupId":"Physician","label":"Intensive care","value":29},{"broad_division_id":1,"groupId":"Physician","label":"Internal medicine","value":30},{"broad_division_id":1,"groupId":"Physician","label":"Palliative care","value":31},{"broad_division_id":1,"groupId":"Physician","label":"Neonatalology","value":32},{"broad_division_id":1,"groupId":"Physician","label":"Nephrology","value":33},{"broad_division_id":1,"groupId":"Physician","label":"Neurology","value":34},{"broad_division_id":1,"groupId":"Physician","label":"Obstetrics and/or gynaecology","value":35},{"broad_division_id":1,"groupId":"Physician","label":"Oncology","value":36},{"broad_division_id":1,"groupId":"Physician","label":"Ophthalmology","value":37},{"broad_division_id":1,"groupId":"Physician","label":"Pain management","value":38},{"broad_division_id":1,"groupId":"Physician","label":"Pediatrics","value":39},{"broad_division_id":1,"groupId":"Physician","label":"Psychiatry","value":40},{"broad_division_id":1,"groupId":"Physician","label":"Radiation oncology","value":41},{"broad_division_id":1,"groupId":"Physician","label":"Rehabilitation medicine","value":42},{"broad_division_id":1,"groupId":"Physician","label":"Pulmonology","value":43},{"broad_division_id":1,"groupId":"Physician","label":"Rheumatology","value":44},{"broad_division_id":1,"groupId":"Physician","label":"Other specialised medicine","value":45},{"broad_division_id":1,"groupId":"Surgery","label":"General surgeon","value":46},{"broad_division_id":1,"groupId":"Surgery","label":"Cardiothoracic surgeon","value":47},{"broad_division_id":1,"groupId":"Surgery","label":"Colorectal surgeon","value":48},{"broad_division_id":1,"groupId":"Surgery","label":"Otolaryngology","value":49},{"broad_division_id":1,"groupId":"Surgery","label":"Head and neck surgeon","value":50},{"broad_division_id":1,"groupId":"Surgery","label":"Hepatobiliary surgeon","value":51},{"broad_division_id":1,"groupId":"Surgery","label":"Maxillofacial surgeon","value":52},{"broad_division_id":1,"groupId":"Surgery","label":"Neurosurgeon","value":53},{"broad_division_id":1,"groupId":"Surgery","label":"Oncological surgeon","value":54},{"broad_division_id":1,"groupId":"Surgery","label":"Orthopedic surgeon","value":55},{"broad_division_id":1,"groupId":"Surgery","label":"Plastic surgeon","value":56},{"broad_division_id":1,"groupId":"Surgery","label":"Trauma surgeon","value":57},{"broad_division_id":1,"groupId":"Surgery","label":"Urology","value":58},{"broad_division_id":1,"groupId":"Surgery","label":"Vascular surgeon","value":59},{"broad_division_id":1,"groupId":"Surgery","label":"Other surgeon","value":60},{"broad_division_id":1,"groupId":"Anaesthetics","label":"Anesthesiology","value":61},{"broad_division_id":1,"groupId":"Other medical doctor","label":"Other medical doctor","value":62},{"broad_division_id":2,"groupId":"Imaging technologist","label":"General radiography","value":63},{"broad_division_id":2,"groupId":"Imaging technologist","label":"Angiography","value":64},{"broad_division_id":2,"groupId":"Imaging technologist","label":"CT radiography","value":65},{"broad_division_id":2,"groupId":"Imaging technologist","label":"MR imaging","value":66},{"broad_division_id":2,"groupId":"Imaging technologist","label":"Nuclear medicine","value":67},{"broad_division_id":2,"groupId":"Imaging technologist","label":"Radiation therapy","value":68},{"broad_division_id":2,"groupId":"Imaging technologist","label":"Radiology technician","value":69},{"broad_division_id":2,"groupId":"Imaging technologist","label":"Ultrasonography","value":70},{"broad_division_id":2,"groupId":"Imaging technologist","label":"Other imaging technologist","value":71},{"broad_division_id":3,"groupId":"Dentistry/dental science","label":"General dentistry","value":72},{"broad_division_id":3,"groupId":"Dentistry/dental science","label":"Endodontistry","value":73},{"broad_division_id":3,"groupId":"Dentistry/dental science","label":"Paediatric dentistry","value":74},{"broad_division_id":3,"groupId":"Dentistry/dental science","label":"Pedodontistry","value":75},{"broad_division_id":3,"groupId":"Dentistry/dental science","label":"Periodontistry","value":76},{"broad_division_id":3,"groupId":"Dentistry/dental science","label":"Prosthodontistry","value":77},{"broad_division_id":3,"groupId":"Dentistry/dental science","label":"Oral and maxillofacial surgery","value":78},{"broad_division_id":3,"groupId":"Dentistry/dental science","label":"Oral pathology","value":79},{"broad_division_id":3,"groupId":"Dentistry/dental science","label":"Orthodontistry","value":80},{"broad_division_id":3,"groupId":"Dentistry/dental science","label":"Other dentistry","value":81},{"broad_division_id":4,"groupId":"Nursing","label":"General nursing","value":82},{"broad_division_id":4,"groupId":"Nursing","label":"Anesthetic nursing","value":83},{"broad_division_id":4,"groupId":"Nursing","label":"Dental nursing","value":84},{"broad_division_id":4,"groupId":"Nursing","label":"Emergency nursing","value":85},{"broad_division_id":4,"groupId":"Nursing","label":"Intensive care nursing","value":86},{"broad_division_id":4,"groupId":"Nursing","label":"Medical nursing","value":87},{"broad_division_id":4,"groupId":"Nursing","label":"Pediatric nursing","value":88},{"broad_division_id":4,"groupId":"Nursing","label":"Rehabilitation nursing","value":89},{"broad_division_id":4,"groupId":"Nursing","label":"Surgical nursing","value":90},{"broad_division_id":4,"groupId":"Nursing","label":"Other nursing","value":91},{"broad_division_id":5,"groupId":"Allied health","label":"Dietician","value":92},{"broad_division_id":5,"groupId":"Allied health","label":"Occupational therapy","value":93},{"broad_division_id":5,"groupId":"Allied health","label":"Physiotherapy","value":94},{"broad_division_id":5,"groupId":"Allied health","label":"Speech pathology","value":95},{"broad_division_id":5,"groupId":"Allied health","label":"Other allied health","value":96}]},"training_levels":[{"broad_division_id":1,"value":1,"region_labels":{"4":"Undergraduate Non-Medicine (year 1)","3":"Undergraduate Non-Medicine (year 1)","2":"Undergraduate Non-Medicine (year 1)","1":"Undergraduate Non-Medicine (year 1)"}},{"broad_division_id":1,"value":2,"region_labels":{"2":"Undergraduate Non-Medicine (year 2)","4":"Undergraduate Non-Medicine (year 2)","3":"Undergraduate Non-Medicine (year 2)","1":"Undergraduate Non-Medicine (year 2)"}},{"broad_division_id":1,"value":3,"region_labels":{"3":"Undergraduate Non-Medicine (year 3)","1":"Undergraduate Non-Medicine (year 3)","2":"Undergraduate Non-Medicine (year 3)","4":"Undergraduate Non-Medicine (year 3)"}},{"broad_division_id":1,"value":4,"region_labels":{"4":"Undergraduate Non-Medicine (year 4)","3":"Undergraduate Non-Medicine (year 4)","1":"Undergraduate Non-Medicine (year 4)","2":"Undergraduate Non-Medicine (year 4)"}},{"broad_division_id":1,"value":5,"region_labels":{"2":"Undergraduate Non-Medicine (year 5+)","3":"Undergraduate Non-Medicine (year 5+)","4":"Undergraduate Non-Medicine (year 5+)","1":"Undergraduate Non-Medicine (year 5+)"}},{"broad_division_id":1,"value":6,"region_labels":{"2":"Medical Student (year 1)","3":"Medical Student (year 1)","1":"Medical Student (year 1)","4":"Medical Student (year 1)"}},{"broad_division_id":1,"value":7,"region_labels":{"4":"Medical Student (year 2)","3":"Medical Student (year 2)","2":"Medical Student (year 2)","1":"Medical Student (year 2)"}},{"broad_division_id":1,"value":8,"region_labels":{"4":"Medical Student (year 3)","2":"Medical Student (year 3)","1":"Medical Student (year 3)","3":"Medical Student (year 3)"}},{"broad_division_id":1,"value":9,"region_labels":{"4":"Medical Student (year 4)","1":"Medical Student (year 4)","3":"Medical Student (year 4)","2":"Medical Student (year 4)"}},{"broad_division_id":1,"value":10,"region_labels":{"2":"Medical Student (year 5)","4":"Medical Student (year 5)","3":"Medical Student (year 5)","1":"Medical Student (year 5)"}},{"broad_division_id":1,"value":11,"region_labels":{"2":"Medical Student (year 6+)","1":"Medical Student (year 6+)","4":"Medical Student (year 6+)","3":"Medical Student (year 6+)"}},{"broad_division_id":1,"value":12,"region_labels":{"4":"Foundation Doctor (FY1)","3":"Postgraduate year 1 (PGY 1)","2":"Intern","1":"Intern"}},{"broad_division_id":1,"value":13,"region_labels":{"1":"Junior Doctor (HMO year 1)","2":"Resident (HMO year 1)","4":"Foundation Doctor (FY2)"}},{"broad_division_id":1,"value":14,"region_labels":{"1":"Junior Doctor (HMO year 2+)","4":"Foundation Doctor (FY3+)","2":"Resident (HMO year 2+)"}},{"broad_division_id":1,"value":15,"region_labels":{"3":"Postgraduate year 2 (PGY 2)","2":"Registrar (year 1)","4":"Specialty trainee year (ST 1)","1":"Specialty trainee (year 1)"}},{"broad_division_id":1,"value":16,"region_labels":{"3":"Postgraduate year 3 (PGY 3)","1":"Specialty trainee (year 2)","2":"Registrar (year 2)","4":"Specialty trainee year (ST 2)"}},{"broad_division_id":1,"value":17,"region_labels":{"3":"Postgraduate year 4 (PGY 4)","1":"Specialty trainee (year 3)","4":"Specialty trainee year (ST 3)","2":"Registrar (year 3)"}},{"broad_division_id":1,"value":18,"region_labels":{"3":"Postgraduate year 5 (PGY 6)","4":"Specialty trainee year (ST 4)","1":"Specialty trainee (year 4)","2":"Registrar (year 4)"}},{"broad_division_id":1,"value":19,"region_labels":{"4":"Specialty trainee year (ST 5)","2":"Registrar (year 5)","1":"Specialty trainee (year 5)"}},{"broad_division_id":1,"value":20,"region_labels":{"2":"Registrar (year 6)","1":"Specialty trainee (year 6)","4":"Specialty trainee year (ST 6)"}},{"broad_division_id":1,"value":21,"region_labels":{"4":"Specialty trainee year (ST 7+)","1":"Specialty trainee (year 7+)","2":"Registrar (year 7+)"}},{"broad_division_id":1,"value":22,"region_labels":{"3":"Fellow (PGY 6)","2":"Fellow (year 1)","4":"Fellow (year 1)","1":"Fellow (year 1)"}},{"broad_division_id":1,"value":23,"region_labels":{"3":"Fellow (PGY 7+)","2":"Fellow (year 2+)","1":"Fellow (year 2+)","4":"Fellow (year 2+)"}},{"broad_division_id":1,"value":24,"region_labels":{"3":"Attending (year 1-5)","4":"Consultant (year 1-5)","2":"Consultant (year 1-5)","1":"Consultant/Attending (year 1-5)"}},{"broad_division_id":1,"value":25,"region_labels":{"3":"Attending (year 6-10)","4":"Consultant (year 6-10)","1":"Consultant/Attending (year 6-10)","2":"Consultant (year 6-10)"}},{"broad_division_id":1,"value":26,"region_labels":{"3":"Attending (year 11-15)","4":"Consultant (year 11-15)","2":"Consultant (year 11-15)","1":"Consultant/Attending (year 11-15)"}},{"broad_division_id":1,"value":27,"region_labels":{"3":"Attending (year 15+)","1":"Consultant/Attending (year 15+)","2":"Consultant (year 15+)","4":"Consultant (year 15+)"}},{"broad_division_id":2,"value":28,"region_labels":{"3":"Student (year 1)","4":"Student (year 1)","1":"Student (year 1)","2":"Student (year 1)"}},{"broad_division_id":2,"value":29,"region_labels":{"3":"Student (year 2)","2":"Student (year 2)","4":"Student (year 2)","1":"Student (year 2)"}},{"broad_division_id":2,"value":30,"region_labels":{"3":"Student (year 3)","2":"Student (year 3)","1":"Student (year 3)","4":"Student (year 3)"}},{"broad_division_id":2,"value":31,"region_labels":{"3":"Student (year 4+)","2":"Student (year 4+)","4":"Student (year 4+)","1":"Student (year 4+)"}},{"broad_division_id":2,"value":32,"region_labels":{"3":"Radiographer/Technician","4":"Radiographer/Technician","1":"Radiographer/Technician","2":"Radiographer/Technician"}},{"broad_division_id":3,"value":39,"region_labels":{"3":"Undergraduate Non-Dental (year 1)","4":"Undergraduate Non-Dental (year 1)","1":"Undergraduate Non-Dental (year 1)","2":"Undergraduate Non-Dental (year 1)"}},{"broad_division_id":3,"value":40,"region_labels":{"3":"Undergraduate Non-Dental (year 2)","2":"Undergraduate Non-Dental (year 2)","4":"Undergraduate Non-Dental (year 2)","1":"Undergraduate Non-Dental (year 2)"}},{"broad_division_id":3,"value":41,"region_labels":{"3":"Undergraduate Non-Dental (year 3)","2":"Undergraduate Non-Dental (year 3)","1":"Undergraduate Non-Dental (year 3)","4":"Undergraduate Non-Dental (year 3)"}},{"broad_division_id":3,"value":42,"region_labels":{"3":"Undergraduate Non-Dental (year 4)","4":"Undergraduate Non-Dental (year 4)","2":"Undergraduate Non-Dental (year 4)","1":"Undergraduate Non-Dental (year 4)"}},{"broad_division_id":3,"value":43,"region_labels":{"3":"Undergraduate Non-Dental (year 5+)","1":"Undergraduate Non-Dental (year 5+)","2":"Undergraduate Non-Dental (year 5+)","4":"Undergraduate Non-Dental (year 5+)"}},{"broad_division_id":3,"value":44,"region_labels":{"3":"Dentistry Student (year 1)","1":"Dentistry Student (year 1)","2":"Dentistry Student (year 1)","4":"Dentistry Student (year 1)"}},{"broad_division_id":3,"value":45,"region_labels":{"3":"Dentistry Student (year 2)","1":"Dentistry Student (year 2)","2":"Dentistry Student (year 2)","4":"Dentistry Student (year 2)"}},{"broad_division_id":3,"value":46,"region_labels":{"3":"Dentistry Student (year 3)","2":"Dentistry Student (year 3)","4":"Dentistry Student (year 3)","1":"Dentistry Student (year 3)"}},{"broad_division_id":3,"value":47,"region_labels":{"3":"Dentistry Student (year 4)","4":"Dentistry Student (year 4)","1":"Dentistry Student (year 4)","2":"Dentistry Student (year 4)"}},{"broad_division_id":3,"value":48,"region_labels":{"3":"Dentistry Student (year 5)","1":"Dentistry Student (year 5)","4":"Dentistry Student (year 5)","2":"Dentistry Student (year 5)"}},{"broad_division_id":3,"value":49,"region_labels":{"3":"Dentistry Student (year 6+)","1":"Dentistry Student (year 6+)","4":"Dentistry Student (year 6+)","2":"Dentistry Student (year 6+)"}},{"broad_division_id":3,"value":50,"region_labels":{"3":"General Dentist","2":"General Dentist","4":"General Dentist","1":"General Dentist"}},{"broad_division_id":3,"value":51,"region_labels":{"3":"Specialty Dentist","4":"Specialty Dentist","1":"Specialty Dentist","2":"Specialty Dentist"}},{"broad_division_id":4,"value":33,"region_labels":{"3":"Nursing Student (year 1)","2":"Nursing Student (year 1)","1":"Nursing Student (year 1)","4":"Nursing Student (year 1)"}},{"broad_division_id":4,"value":34,"region_labels":{"3":"Nursing Student (year 2)","2":"Nursing Student (year 2)","1":"Nursing Student (year 2)","4":"Nursing Student (year 2)"}},{"broad_division_id":4,"value":35,"region_labels":{"3":"Nursing Student (year 3)","4":"Nursing Student (year 3)","1":"Nursing Student (year 3)","2":"Nursing Student (year 3)"}},{"broad_division_id":4,"value":36,"region_labels":{"3":"Nursing Student (year 4+)","4":"Nursing Student (year 4+)","2":"Nursing Student (year 4+)","1":"Nursing Student (year 4+)"}},{"broad_division_id":4,"value":37,"region_labels":{"3":"Registered Nurse","2":"Registered Nurse","4":"Registered Nurse","1":"Registered Nurse"}},{"broad_division_id":4,"value":38,"region_labels":{"3":"Specialty Nurse","2":"Specialty Nurse","1":"Specialty Nurse","4":"Specialty Nurse"}},{"broad_division_id":5,"value":52,"region_labels":{"3":"Allied Health Student (year 2)","1":"Allied Health Student (year 2)","4":"Allied Health Student (year 2)","2":"Allied Health Student (year 2)"}},{"broad_division_id":5,"value":53,"region_labels":{"3":"Allied Health Student (year 3)","2":"Allied Health Student (year 3)","1":"Allied Health Student (year 3)","4":"Allied Health Student (year 3)"}},{"broad_division_id":5,"value":54,"region_labels":{"3":"Allied Health Student (year 4)","1":"Allied Health Student (year 4)","4":"Allied Health Student (year 4)","2":"Allied Health Student (year 4)"}},{"broad_division_id":5,"value":55,"region_labels":{"3":"Allied Health Student (year 5+)","1":"Allied Health Student (year 5+)","4":"Allied Health Student (year 5+)","2":"Allied Health Student (year 5+)"}},{"broad_division_id":5,"value":56,"region_labels":{"3":"Allied Health Professional","4":"Allied Health Professional","2":"Allied Health Professional","1":"Allied Health Professional"}}],"default_training_region_id":1,"en_us_country_ids":[5,12,20,31,33,48,51,52,53,62,63,65,93,96,99,101,114,122,130,159,167,175,176,188,209,212,228,234,235,236,239,240,242],"selected_country_id":235,"email":"","container_id":"signup-modal-container"}

Image reconstruction (CT)

A.Prof Frank Gaillard ◉ ◈ and Andrew Murphy ◉ et al.

Image reconstruction in computed tomography is a rapidly evolving industry, the race to produce an efficient yet accurate image reconstruction method while keeping scan dose to a minimum has defined improvements in CT over the past decade.

The mathematical problem that CT image reconstruction is trying to solve is to compute the attenuation coefficients of different x-ray absorption paths (ray sum) that are obtained as a set of data (projection).

Reconstruction algorithms

There are various algorithms used in CT image reconstruction, the following are some of the more common algorithms utilized in commercially available CT today.

iterative algorithm without statistical modelling
- used originally by Hounsfield however not commercially used due to computer limitations
- will use an assumption and will compare to the assumption with its measured data. Then will continue to make iterations until the two data sets are in agreement.
iterative algorithm with statistical modelling
- iterative reconstruction with statistical modelling that takes into account either
- optics (x-ray source, image voxels and detector)
- noise (photon statistics)
- physics (data acquisition)
- object (radiation attenuation)
back projection
- not used in the clinical setting, as it is unable to produce sharp images
- known for its distinctive artefact that resembles a star
filtered back projection (convolution method)
- still widely used in CT today
- utilizes a convolution filter to alleviate the blurring associated with back projection
- fast, however, has several limitations including noise and artefact creation

Quiz questions

References

Physics and imaging technology: CT

computed tomography (CT)
- CT technology
- dual energy CT
  - clinical applications of dual energy CT
    - virtual non-contrast imaging
    - abdominal
    - vascular
    - urinary system
    - musculoskeletal
- CT image reconstruction
- CT image quality
- CT dose
- CT contrast medium
  - iodinated contrast media
- coronary CT angiography
- CT artifacts
  - patient-based artifacts
    - motion artifact
    - transient interruption of contrast
  - physics-based artifacts
  - hardware-based artifacts
    - ring artifact
    - tube arcing
    - out of field artifact
    - air bubble artifact
    - helical and multichannel artifacts
- CT safety
- history of CT
  - Godfrey N Hounsfield

Article information

rID: 51829

Section: Physics

Synonyms or Alternate Spellings:

Support Radiopaedia and see fewer ads

Updating… Please wait.

Unable to process the form. Check for errors and try again.

Thank you for updating your details.