Question 1003
{"accessible":false,"alternatives":[{"id":5024,"text":"always be black"},{"id":5025,"text":"always be white"},{"id":5026,"text":"depend on the direction of flow"},{"id":5027,"text":"depend on the manufacturer"},{"id":5028,"text":"isointense to brain parenchyma"},{"id":5029,"text":"isointense to calcificaiton"}],"archived":false,"correctAlternativeId":5027,"explanation":"\u003cp\u003eThe key to this question is recognizing that the phase images,\u0026nbsp;behave differently to the susceptibility-weighted images (SWI)\u0026nbsp;images that are most commonly viewed.\u0026nbsp;\u003c/p\u003e\u003cp\u003eThe signal intensity of veins will be low on SWI but will vary on phase imaging, depending on the vendor. It will, however, be the same as other slow-flowing veins and the opposite of calcification (broadly speaking, and not considering aliasing artefacts).\u0026nbsp;\u003c/p\u003e\u003cp\u003eThe direction of flow will have an effect as will the speed but only at higher velocities like those encountered in the dural venous sinuses or arteries.\u0026nbsp;\u003c/p\u003e","id":1003,"imageUrl":null,"imageAttribution":null,"imageAttributionCaseInfo":null,"firstQuestionPath":"/questions/2965","nextQuestionPath":null,"relatedArticles":[{"id":1215,"title":"Developmental venous anomaly","link":"/articles/developmental-venous-anomaly?lang=us"}],"alsoUsedIn":[{"id":1181,"kind":"Course","title":"Adult Neuroradiology Review Course - page 1181","link":"https://radiopaedia.org/courses/adult-neuroradiology-review-course/pages/1181"},{"id":1181,"kind":"Course","title":"Adult Neuroradiology Review Course - page 1181","link":"https://radiopaedia.org/courses/adult-brain-mri-review-course-2015-online-video/pages/1181"},{"id":206,"kind":"Course","title":"Cases in Radiology: Brain - page 206","link":"https://radiopaedia.org/courses/cases-in-radiology-brain/pages/206"}],"stem":"\u003cp\u003eOn the phase images of susceptibility weighted scans, the signal intensity of a small cerebral developmental venous anomalies will...\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/1003"}],"attemptsPercentages":[{"alternativeId":"5027","percentage":24},{"alternativeId":"5028","percentage":2},{"alternativeId":"5025","percentage":5},{"alternativeId":"5029","percentage":2},{"alternativeId":"5026","percentage":20},{"alternativeId":"5024","percentage":47}],"promptToLogin":false,"questionManager":false,"articleId":"phase-contrast-imaging"}