Question 984
{"accessible":false,"alternatives":[{"id":4931,"text":"bone"},{"id":4932,"text":"lung"},{"id":4933,"text":"mediastinal"},{"id":4934,"text":"stroke"},{"id":4935,"text":"subdural"}],"archived":false,"correctAlternativeId":4934,"explanation":"\u003cp\u003eThe 'narrowness' of CT window width and level settings refers to the range of HU values the width covers. Stroke window is optimized to detect subtle changes in grey and white matter which are close together (40 HU and 30 HU respectively). As such it is very narrow (typically a width somewhere between 8-40 HU is used). In comparison, soft tissue window such as subdural or mediastinal will have\u0026nbsp;widths of over 150 HU and lung and bone windows widths of over 1000 HU.\u0026nbsp;\u003c/p\u003e","id":984,"imageUrl":null,"imageAttribution":null,"imageAttributionCaseInfo":null,"firstQuestionPath":"/questions/2307","nextQuestionPath":"/articles/windowing-ct/questions/983","relatedArticles":[],"alsoUsedIn":[{"id":99,"kind":"Course","title":"Emergency Radiology Course - Melbourne - page 99","link":"https://radiopaedia.org/courses/emergency-radiology-course-melbourne-2020/pages/99"},{"id":99,"kind":"Course","title":"Trauma Radiology Course - Sydney - page 99","link":"https://radiopaedia.org/courses/trauma-radiology-course-sydney-2020/pages/99"},{"id":99,"kind":"Course","title":"Trauma CT Brain Learning Pathway - page 99","link":"https://radiopaedia.org/courses/trauma-ct-brain-learning-pathway/pages/99"}],"stem":"\u003cp\u003eWhich of the following CT window settings would be considered most narrow?\u0026nbsp;\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/984"}],"attemptsPercentages":[{"alternativeId":"4931","percentage":25},{"alternativeId":"4935","percentage":21},{"alternativeId":"4933","percentage":4},{"alternativeId":"4934","percentage":44},{"alternativeId":"4932","percentage":6}],"promptToLogin":false,"questionManager":false,"articleId":"windowing-ct"}