Question 1543
{"accessible":false,"alternatives":[{"id":7702,"text":"8-bit, values from 0 to 255"},{"id":7703,"text":"8-bit, values from -128 to +127"},{"id":7704,"text":"10-bit, values from 0 to 1023"},{"id":7705,"text":"10-bit, values from -128 to +895"},{"id":7706,"text":"12-bit, values from 0 to 4095"},{"id":7707,"text":"12-bit, values from -1024 to +3071"}],"archived":false,"correctAlternativeId":7707,"explanation":"\u003cp\u003eHounsfield units range from\u0026nbsp;-1000 HU for air to +~2000 HU for very dense bone and over 3000 for some metals.\u0026nbsp;\u003c/p\u003e\u003cp\u003eCT images, therefore, use 12-bit images able to store values between −1024 to 3071. How these values are displayed is then determined by the application of specific\u0026nbsp;\u003ca href=\"https://radiopaedia.org/articles/windowing-ct?lang=gb\"\u003ewindow and level\u003c/a\u003e\u0026nbsp;values.\u0026nbsp;\u003c/p\u003e","id":1543,"imageUrl":null,"imageAttribution":null,"imageAttributionCaseInfo":null,"firstQuestionPath":"/questions/2308","nextQuestionPath":"/articles/hounsfield-unit/questions/485","relatedArticles":[],"alsoUsedIn":[{"id":244,"kind":"Course","title":"Preparing images for publication","link":"https://radiopaedia.org/courses/preparing-images-for-publication"},{"id":608,"kind":"Course","title":"Radiopaedia 2020 - Lectures Only - page 608","link":"https://radiopaedia.org/courses/radiopaedia-2020-exclusive/pages/608"},{"id":608,"kind":"Course","title":"Miscellaneous Lectures - page 608","link":"https://radiopaedia.org/courses/miscellaneous-lectures/pages/608"},{"id":608,"kind":"Course","title":"2020 Virtual Conference Private Use - page 608","link":"https://radiopaedia.org/courses/2020-virtual-conference-private-use/pages/608"}],"stem":"\u003cp\u003eCT images are typically stored with which of the following bit-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/1543"}],"attemptsPercentages":[{"alternativeId":"7707","percentage":50},{"alternativeId":"7704","percentage":4},{"alternativeId":"7706","percentage":20},{"alternativeId":"7705","percentage":4},{"alternativeId":"7702","percentage":16},{"alternativeId":"7703","percentage":7}],"promptToLogin":false,"questionManager":false,"articleId":"hounsfield-unit"}