Question 2824
{"accessible":false,"alternatives":[{"id":13784,"text":"beam divergence"},{"id":13785,"text":"beam steering"},{"id":13786,"text":"motion artifact"},{"id":13787,"text":"reverberation artifact"},{"id":13788,"text":"side lobes"}],"archived":false,"correctAlternativeId":13788,"explanation":"\u003cp\u003eSide lobes are caused by the radial expansion of piezoelectric crystals. The expansion and contraction of piezoelectric crystals occurs in a 3 dimensional plane (radial expansion). The changes in crystal height and width leads to the generation of side lobes.\u003c/p\u003e\u003cp\u003eChanges in crystal thickness are responsible for the propogation of the main ultrasound beam.\u003c/p\u003e","id":2824,"imageUrl":null,"imageAttribution":null,"imageAttributionCaseInfo":null,"firstQuestionPath":"/questions/2832","nextQuestionPath":null,"relatedArticles":[{"id":31476,"title":"Ultrasound artifacts","link":"/articles/ultrasound-artifacts-3?lang=us"},{"id":68391,"title":"Beam steering","link":"/articles/beam-steering?lang=us"}],"alsoUsedIn":[{"id":1615,"kind":"RestrictedPage","title":"Page 1615 (in no courses)","link":"https://radiopaedia.org/admin/restricted_pages/1615"},{"id":1979,"kind":"Course","title":"Imaging Physics: Ultrasound Peer Review - page 1979","link":"https://radiopaedia.org/courses/imaging-physics-ultrasound-peer-review/pages/1979"},{"id":1979,"kind":"Course","title":"Imaging Physics: Ultrasound - page 1979","link":"https://radiopaedia.org/courses/imaging-physics-ultrasound/pages/1979"}],"stem":"\u003cp\u003eRadial expansion of piezoelectric transducer crystals is responsible for which phenomenon?\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/2824"}],"attemptsPercentages":[{"alternativeId":"13788","percentage":72},{"alternativeId":"13787","percentage":4},{"alternativeId":"13786","percentage":3},{"alternativeId":"13784","percentage":13},{"alternativeId":"13785","percentage":8}],"promptToLogin":false,"questionManager":false,"articleId":"side-lobe-artifact"}