Question 615
{"accessible":false,"alternatives":[{"id":3082,"text":"increasing beam filtration"},{"id":3083,"text":"increasing kVp"},{"id":3084,"text":"increasing mAs"},{"id":3085,"text":"decreasing beam filtration"},{"id":3086,"text":"decreasing kVp"},{"id":3087,"text":"decreasing mAs"}],"archived":false,"correctAlternativeId":3084,"explanation":"\u003cp\u003eThe number of x-ray photons generated at the anode depends on the x-ray tube current and time, i.e. the mAs. The effect of mAs on the energy spectrum is to increase the intensity at all X-ray energies and to otherwise leave the spectrum unchanged. This results in increased signal-to-noise ratio but should not\u0026nbsp;change the subject contrast.\u003c/p\u003e\u003cp\u003eAdapted from\u0026nbsp;\"Basic Physics of Digital Radiography\" 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":615,"imageUrl":null,"imageAttribution":null,"imageAttributionCaseInfo":null,"firstQuestionPath":"/questions/649","nextQuestionPath":null,"relatedArticles":[{"id":29650,"title":"Kilovoltage peak","link":"/articles/kilovoltage-peak?lang=gb"},{"id":29737,"title":"Filters","link":"/articles/filters?lang=gb"},{"id":52512,"title":"Milliampere-seconds (mAs)","link":"/articles/milliampere-seconds-mas?lang=gb"}],"alsoUsedIn":[],"stem":"\u003cp\u003eThe intensity of an x-ray beam increases and the subject contrast remains unchanged 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/615"}],"attemptsPercentages":[{"alternativeId":"3084","percentage":44},{"alternativeId":"3087","percentage":10},{"alternativeId":"3085","percentage":7},{"alternativeId":"3082","percentage":17},{"alternativeId":"3086","percentage":5},{"alternativeId":"3083","percentage":17}],"promptToLogin":false,"questionManager":false,"articleId":"x-ray-production"}