Question 41
{"accessible":false,"alternatives":[{"id":187,"text":" 33.2 keV"},{"id":186,"text":" 37.4 keV"},{"id":200,"text":"140.0 KeV"},{"id":189,"text":"33.2 kVp"},{"id":199,"text":"37.4 kVP"},{"id":188,"text":"140.0 kVp "}],"archived":false,"correctAlternativeId":187,"explanation":"\u003cp\u003eIodine\u003cstrong\u003e \u003c/strong\u003ehas a particular advantage as a contrast agent because its K-shell \u003ca href=\"https://radiopaedia.org/articles/photoelectric-effect\"\u003ebinding energy\u003c/a\u003e of 33.2 KeV is similar to that of the mean energy of diagnostic radiography beams. Consequently, it will have an increased attenuation compared to the anatomical structures that surround it. 140 kVp is a commonly used kilovoltage peak in computed tomography.\u003c/p\u003e\u003cp\u003e37.4 KeV is the binding shell energy of barium, another commonly used X-ray contrast medium.\u003c/p\u003e","id":41,"imageUrl":null,"imageAttribution":null,"imageAttributionCaseInfo":null,"firstQuestionPath":"/questions/41","nextQuestionPath":null,"relatedArticles":[{"id":48582,"title":"Iodinated contrast media","link":"/articles/iodinated-contrast-media-1?lang=us"}],"alsoUsedIn":[],"stem":"\u003cp\u003eWhat is the K-shell binding energy\u0026nbsp; (K-edge) of iodinated contrast?\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/41"}],"attemptsPercentages":[{"alternativeId":"189","percentage":7},{"alternativeId":"187","percentage":65},{"alternativeId":"186","percentage":11},{"alternativeId":"188","percentage":4},{"alternativeId":"199","percentage":3},{"alternativeId":"200","percentage":11}],"promptToLogin":false,"questionManager":false,"articleId":"dual-energy-ct"}