Question 624
{"accessible":false,"alternatives":[{"id":3127,"text":"equally at all photon energies"},{"id":3128,"text":"only at higher photon energies"},{"id":3129,"text":"only at the lower photon energies"},{"id":3130,"text":"mostly at the higher photon energies"},{"id":3131,"text":"mostly at the lower photon energies"},{"id":3132,"text":"randomly at all photon energies"}],"archived":false,"correctAlternativeId":3131,"explanation":"\u003cp\u003eFilters\u003cstrong\u003e\u0026nbsp;\u003c/strong\u003eare metallic sheets that are designed to mainly absorb the low-energy x-ray photons from the\u0026nbsp;spectrum. If unfiltered these low-energy x-ray photons are absorbed in the patient, thus not contributing to image formation and just increase patient\u0026nbsp;dose. Therefore using a filter reduces the patient dose.\u003c/p\u003e\u003cp\u003eAdapted from\u0026nbsp;\u003ca href=\"https://en.wikibooks.org/wiki/Basic_Physics_of_Digital_Radiography\"\u003eBasic Physics of Digital Radiography\u003c/a\u003e\u0026nbsp;by\u0026nbsp;Kieran Maher,\u0026nbsp;with author's permission (License:\u0026nbsp;\u003ca href=\"https://creativecommons.org/licenses/by-sa/3.0/\"\u003eCreative Commons\u0026nbsp;BY-SA 3.0\u003c/a\u003e).\u003c/p\u003e","id":624,"imageUrl":null,"imageAttribution":null,"imageAttributionCaseInfo":null,"firstQuestionPath":"/questions/2608","nextQuestionPath":"/articles/filters/questions/623","relatedArticles":[],"alsoUsedIn":[],"stem":"\u003cp\u003eIncreasing filtration reduces the intensity of the x-ray spectrum...\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/624"}],"attemptsPercentages":[{"alternativeId":"3132","percentage":3},{"alternativeId":"3130","percentage":10},{"alternativeId":"3127","percentage":12},{"alternativeId":"3128","percentage":7},{"alternativeId":"3129","percentage":21},{"alternativeId":"3131","percentage":47}],"promptToLogin":false,"questionManager":false,"articleId":"filters"}