Question 766
{"accessible":false,"alternatives":[{"id":3892,"text":"decreasing beam filtration"},{"id":3891,"text":"increasing the kV"},{"id":3890,"text":"using collimation"},{"id":3889,"text":"using a grid"},{"id":3893,"text":"using a smaller focal spot"}],"archived":false,"correctAlternativeId":3890,"explanation":"\u003cp\u003eCollimation reduces the area exposed and will reduce\u0026nbsp;the patient's exposure. Increasing the kV and decreasing beam filtration will result in increased patient dose.\u003c/p\u003e\u003cp\u003eGrids are used to reduce scatter, and since scatter occurs at higher kV a grid will not reduce the dose.\u0026nbsp;\u003c/p\u003e\u003cp\u003eA smaller focal spot\u0026nbsp;size reduces the heat capacity of the anode and\u0026nbsp;alters image quality without changing the exposure parameters.\u0026nbsp;\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":766,"imageUrl":null,"imageAttribution":null,"imageAttributionCaseInfo":null,"firstQuestionPath":"/questions/807","nextQuestionPath":"/articles/beam-collimators/questions/761","relatedArticles":[{"id":29737,"title":"Filters","link":"/articles/filters?lang=us"},{"id":30312,"title":"Grids","link":"/articles/grids?lang=us"},{"id":29771,"title":"Focal spot","link":"/articles/focal-spot?lang=us"}],"alsoUsedIn":[],"stem":"\u003cp\u003eRadiation exposure to a patient can be reduced by...\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/766"}],"attemptsPercentages":[{"alternativeId":"3890","percentage":71},{"alternativeId":"3893","percentage":10},{"alternativeId":"3889","percentage":10},{"alternativeId":"3891","percentage":7},{"alternativeId":"3892","percentage":3}],"promptToLogin":false,"questionManager":false,"articleId":"beam-collimators"}