Question 2826
{"accessible":false,"alternatives":[{"id":13793,"text":"axial resolution"},{"id":13794,"text":"elevational resolution"},{"id":13795,"text":"lateral resolution"},{"id":13796,"text":"temporal resolution"}],"archived":false,"correctAlternativeId":13793,"explanation":"\u003cp\u003eAxial resolution is equal to half the spatial pulse length. Spatial pulse length is a product of the number of cycles in the pulse and the wavelength of the wave. Both of these parameter are depth independent.\u003c/p\u003e\u003cp\u003eLateral and elevational resolution improves in the near field before worsening as the beam diverges after the focal zone.\u003c/p\u003e\u003cp\u003eTemporal resolution gets worse with increasing depth as the pulse repetition period needs to increase to account for increasing depth (lowering frame rate).\u003c/p\u003e","id":2826,"imageUrl":null,"imageAttribution":null,"imageAttributionCaseInfo":null,"firstQuestionPath":"/questions/2826","nextQuestionPath":null,"relatedArticles":[{"id":64450,"title":"Pulse repetition frequency","link":"/articles/pulse-repetition-frequency?lang=us"},{"id":66176,"title":"Axial resolution (ultrasound)","link":"/articles/axial-resolution-ultrasound?lang=us"},{"id":66177,"title":"Lateral resolution (ultrasound)","link":"/articles/lateral-resolution-ultrasound?lang=us"},{"id":77444,"title":"Temporal resolution (ultrasound)","link":"/articles/temporal-resolution-ultrasound?lang=us"},{"id":84376,"title":"Spatial pulse length (ultrasound)","link":"/articles/spatial-pulse-length-ultrasound?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\u003eIn ultrasound, which of the following does not change with increasing imaging depth?\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/2826"}],"attemptsPercentages":[{"alternativeId":"13793","percentage":65},{"alternativeId":"13796","percentage":11},{"alternativeId":"13794","percentage":13},{"alternativeId":"13795","percentage":10}],"promptToLogin":false,"questionManager":false,"articleId":"elevational-resolution-ultrasound"}