Question 2835
{"accessible":false,"alternatives":[{"id":13834,"text":"attenuation"},{"id":13835,"text":"rarefaction"},{"id":13836,"text":"reflection"},{"id":13837,"text":"refraction"}],"archived":false,"correctAlternativeId":13835,"explanation":"\u003cp\u003eRarefaction refers to the negative local pressure changes within the ultrasound wave. It is responsible for mechanical bioeffects but cannot cause shadowing in an image.\u003c/p\u003e\u003cp\u003eAttenuation and reflection can cause posterior shadowing.\u003c/p\u003e\u003cp\u003eRefraction can cause edge shadowing.\u003c/p\u003e","id":2835,"imageUrl":null,"imageAttribution":null,"imageAttributionCaseInfo":null,"firstQuestionPath":"/questions/2835","nextQuestionPath":"/articles/attenuation-ultrasound/questions/2821","relatedArticles":[{"id":24967,"title":"Acoustic shadowing","link":"/articles/acoustic-shadowing?lang=us"},{"id":46913,"title":"Refraction","link":"/articles/refraction?lang=us"},{"id":46914,"title":"Refraction artifact","link":"/articles/refraction-artifact-2?lang=us"}],"alsoUsedIn":[{"id":1620,"kind":"RestrictedPage","title":"Page 1620 (in no courses)","link":"https://radiopaedia.org/admin/restricted_pages/1620"},{"id":1984,"kind":"Course","title":"Imaging Physics: Ultrasound Peer Review - page 1984","link":"https://radiopaedia.org/courses/imaging-physics-ultrasound-peer-review/pages/1984"},{"id":1984,"kind":"Course","title":"Imaging Physics: Ultrasound - page 1984","link":"https://radiopaedia.org/courses/imaging-physics-ultrasound/pages/1984"}],"stem":"\u003cp\u003eWhich of the following CANNOT account for shadowing in ultrasound imaging?\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/2835"}],"attemptsPercentages":[{"alternativeId":"13834","percentage":12},{"alternativeId":"13837","percentage":12},{"alternativeId":"13835","percentage":66},{"alternativeId":"13836","percentage":10}],"promptToLogin":false,"questionManager":false,"articleId":"attenuation-ultrasound"}