Question 625
{"accessible":false,"alternatives":[{"id":3154,"text":"decreasing filtration"},{"id":3133,"text":"increasing filtration"},{"id":3135,"text":"decreasing kVp"},{"id":3155,"text":"decreasing mAs"},{"id":3134,"text":"increasing kVp"},{"id":3136,"text":"increasing mAs"}],"archived":false,"correctAlternativeId":3133,"explanation":"\u003cp\u003eAngling of the anode causes differences in x-ray absorption to occur within the anode material itself so that x-rays emerging straight downwards will have an intensity lower than those exiting by a shorter route. This causes a gradient in the x-ray intensities in the beam with lower intensities on the anode side - this is called the \u003cstrong\u003eanode heel effect\u003c/strong\u003e. In comparison, filtration is the process of preferentially removing low energy x-ray photons from a polychromatic radiation beam.\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":625,"imageUrl":null,"imageAttribution":null,"imageAttributionCaseInfo":null,"firstQuestionPath":"/questions/2737","nextQuestionPath":"/articles/anode-x-ray-tube/questions/619","relatedArticles":[{"id":8177,"title":"X-ray tube","link":"/articles/x-ray-tube-1?lang=us"},{"id":29775,"title":"Anode heel effect","link":"/articles/anode-heel-effect?lang=us"},{"id":29737,"title":"Filters","link":"/articles/filters?lang=us"}],"alsoUsedIn":[],"stem":"\u003cp\u003eThe effect on the x-ray spectrum of reducing the anode angle is similar to that of...\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/625"}],"attemptsPercentages":[{"alternativeId":"3154","percentage":13},{"alternativeId":"3155","percentage":13},{"alternativeId":"3133","percentage":41},{"alternativeId":"3135","percentage":13},{"alternativeId":"3134","percentage":11},{"alternativeId":"3136","percentage":9}],"promptToLogin":false,"questionManager":false,"articleId":"anode-x-ray-tube"}