Question 2163
{"accessible":false,"alternatives":[{"id":10737,"text":"calipers should be placed at the outer edge of the near calvarial wall and inner edge of the far calvarial wall"},{"id":10738,"text":"cerebellar hemispheres should be in the plane of the image"},{"id":10740,"text":"it should be measured at the level of frontal horns of lateral ventricles, thalami and cavum septum pellucidum."},{"id":10739,"text":"it should be measured on an axial plane"},{"id":10741,"text":"the transducer must be perpendicular to the central axis of the head"}],"archived":false,"correctAlternativeId":10738,"explanation":"\u003cp\u003eThe BPD should be measured on an axial plane that traverses the thalami, and cavum septum pellucidum. The transducer must be perpendicular to the central axis of the head, and thus the hemispheres and calvaria should appear symmetric.\u0026nbsp;\u003c/p\u003e\u003cp\u003eThe calipers should be placed at the:\u003c/p\u003e\u003cul\u003e\n\u003cli\u003eouter edge of the near calvarial wall\u003c/li\u003e\n\u003cli\u003einner edge of the far calvarial wall\u003c/li\u003e\n\u003c/ul\u003e\u003cp\u003eThe cerebellar hemispheres should not be in the plane of the image.\u0026nbsp;\u003c/p\u003e","id":2163,"imageUrl":null,"imageAttribution":null,"imageAttributionCaseInfo":null,"firstQuestionPath":"/questions/2163","nextQuestionPath":null,"relatedArticles":[{"id":26429,"title":"Biparietal diameter","link":"/articles/biparietal-diameter?lang=us"}],"alsoUsedIn":[{"id":982,"kind":"Course","title":"2021 Virtual Conference Private Use - page 982","link":"https://radiopaedia.org/courses/2021-virtual-conference-private-use/pages/982"},{"id":982,"kind":"Course","title":"Radiopaedia 2021 - isoCME - page 982","link":"https://radiopaedia.org/courses/radiopaedia-2021-isocme/pages/982"},{"id":982,"kind":"Course","title":"2022 Virtual Conference Private Use - page 982","link":"https://radiopaedia.org/courses/2022-virtual-conference-private-use/pages/982"},{"id":970,"kind":"RestrictedPage","title":"Page 970 (in no courses)","link":"https://radiopaedia.org/admin/restricted_pages/970"},{"id":955,"kind":"RestrictedPage","title":"Page 955 (in no courses)","link":"https://radiopaedia.org/admin/restricted_pages/955"},{"id":1,"kind":"LiveSchedule","title":"1","link":"https://radiopaedia.org/admin/live_schedules/1"},{"id":17,"kind":"LiveSchedule","title":"17","link":"https://radiopaedia.org/admin/live_schedules/17"},{"id":891,"kind":"Course","title":"2021 Virtual Conference Private Use - page 891","link":"https://radiopaedia.org/courses/2021-virtual-conference-private-use/pages/891"},{"id":891,"kind":"Course","title":"Radiopaedia 2021 - isoCME - page 891","link":"https://radiopaedia.org/courses/radiopaedia-2021-isocme/pages/891"},{"id":891,"kind":"Course","title":"Obstetrics \u0026 Gynaecology Lectures - page 891","link":"https://radiopaedia.org/courses/obgyn-lectures/pages/891"}],"stem":"\u003cp\u003eRegarding biparietal diameter (BPD) all of the following are true \u003cstrong\u003eEXCEPT...\u003c/strong\u003e\u003c/p\u003e","menuLinks":[{"text":"Report problem with question","url":"https://docs.google.com/forms/d/e/1FAIpQLSfO3soWYhOjJ7yErSysyCe5V4A1CqW7WK3rDA7MtAkecMGqNw/viewform?entry.1624461248\u0026entry.553583435=https://radiopaedia.org/questions/2163"}],"attemptsPercentages":[{"alternativeId":"10741","percentage":9},{"alternativeId":"10740","percentage":6},{"alternativeId":"10737","percentage":10},{"alternativeId":"10738","percentage":70},{"alternativeId":"10739","percentage":4}],"promptToLogin":false,"questionManager":false,"articleId":"first-trimester"}