Question 2307
{"accessible":true,"alternatives":[{"id":11416,"text":"intracranial blood is more dense than extracranial blood"},{"id":11417,"text":"intracranial blood is less dense than extracranial blood"},{"id":11418,"text":"the HUs of blood are at the higher end of the range for a brain window"},{"id":11419,"text":"the HUs of blood are at the lower end of the range for a brain window"}],"archived":false,"correctAlternativeId":11418,"explanation":"\u003cp\u003eExtracranial and intracranial blood are the same density. Intracranial blood appears white because the HU of blood (~60) is near the upper end of the typical range (0-80 HU) for a brain window.\u003c/p\u003e","id":2307,"imageUrl":"https://prod-images-static.radiopaedia.org/images/10859267/017bff536ba9de49a35fea6274c343_big_gallery.jpg","imageAttribution":{"kind":"case","rID":34072},"imageAttributionCaseInfo":{"title":"Extradural hemorrhage","contributor_name":"UoE Radiology","contributor_param":"uoe_meded","case_rid":34072,"case_param":"extradural-haemorrhage-9"},"firstQuestionPath":"/questions/2516","nextQuestionPath":"/articles/extradural-haemorrhage/questions/1622","relatedArticles":[{"id":38181,"title":"Hounsfield unit","link":"/articles/hounsfield-unit?lang=us"},{"id":52108,"title":"Windowing (CT)","link":"/articles/windowing-ct?lang=us"}],"alsoUsedIn":[{"id":1377,"kind":"Course","title":"Head CT: Graphic Novel - page 1377","link":"https://radiopaedia.org/courses/head-ct-graphic-novel/pages/1377"}],"stem":"\u003cp\u003eWhy does blood appear white on a head CT?\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/2307"}],"attemptsPercentages":[{"alternativeId":"11416","percentage":9},{"alternativeId":"11418","percentage":83},{"alternativeId":"11419","percentage":4},{"alternativeId":"11417","percentage":4}],"promptToLogin":false,"questionManager":false,"articleId":"extradural-hemorrhage"}