Question 2833
{"accessible":false,"alternatives":[{"id":13825,"text":"B-mode imaging"},{"id":13826,"text":"continuous wave Doppler"},{"id":13827,"text":"harmonic imaging"},{"id":13828,"text":"pulse wave Doppler"}],"archived":false,"correctAlternativeId":13825,"explanation":"\u003cp\u003eB-mode imaging uses the timing and intensity of returning echoes to create an image. The pulse can have a broad bandwidth without compromising image accuracy (in fact a broad bandwidth reduces spatial pulse length and improves axial resolution).\u003c/p\u003e\u003cp\u003eDoppler imaging and tissue harmonic imaging requires a narrow bandwidth pulse frequency; as frequency is used in the calculation and creation of these images. The narrower bandwidth and increased quality factor results in a loss of axial resolution due to the increased spatial pulse length. \u003c/p\u003e","id":2833,"imageUrl":null,"imageAttribution":null,"imageAttributionCaseInfo":null,"firstQuestionPath":"/questions/2833","nextQuestionPath":"/articles/harmonic-imaging/questions/2832","relatedArticles":[{"id":67204,"title":"Spectral Doppler (ultrasound)","link":"/articles/spectral-doppler-ultrasound?lang=us"},{"id":67339,"title":"Color flow Doppler (ultrasound)","link":"/articles/color-flow-doppler-ultrasound?lang=us"},{"id":67640,"title":"Grey scale imaging (ultrasound)","link":"/articles/grey-scale-imaging-ultrasound?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 ultrasound modes has the shortest spatial pulse length (best axial resolution)?\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/2833"}],"attemptsPercentages":[{"alternativeId":"13826","percentage":7},{"alternativeId":"13827","percentage":12},{"alternativeId":"13825","percentage":65},{"alternativeId":"13828","percentage":16}],"promptToLogin":false,"questionManager":false,"articleId":"harmonic-imaging"}