Question 989
{"accessible":true,"alternatives":[{"id":4953,"text":"A"},{"id":4954,"text":"B"},{"id":4955,"text":"C"},{"id":4956,"text":"D"}],"archived":false,"correctAlternativeId":4954,"explanation":"\u003cp\u003eA and D = soft tissue (brain) algorithm which smooths out density reducing noise.\u0026nbsp;\u003c/p\u003e\u003cp\u003eB and C = bone algorithm which enhances sharp edges but increases noise.\u0026nbsp;\u003c/p\u003e\u003cp\u003eA and B = brain window (W:80, L:40).\u003c/p\u003e\u003cp\u003eC and D = bone window (W:2800 L:600).\u003c/p\u003e\u003cp\u003eTherefore B is the correct answer. It is much too noisy for a diagnostic image.\u0026nbsp;\u003c/p\u003e","id":989,"imageUrl":"https://prod-images-static.radiopaedia.org/multiple_choice_questions/865/image0000_big_gallery.jpeg","imageAttribution":{"kind":"own","user_id":29,"user_param":"frank","user_name":"Frank Gaillard"},"imageAttributionCaseInfo":null,"firstQuestionPath":"/questions/2307","nextQuestionPath":"/articles/windowing-ct/questions/987","relatedArticles":[{"id":8998,"title":"CT head (an approach)","link":"/articles/ct-head-an-approach?lang=us"},{"id":9050,"title":"CT head (technique)","link":"/articles/ct-head-technique-1?lang=us"}],"alsoUsedIn":[{"id":123,"kind":"Course","title":"Emergency Radiology Course - Melbourne - page 123","link":"https://radiopaedia.org/courses/emergency-radiology-course-melbourne-2020/pages/123"},{"id":123,"kind":"Course","title":"Trauma Radiology Course - Sydney - page 123","link":"https://radiopaedia.org/courses/trauma-radiology-course-sydney-2020/pages/123"},{"id":123,"kind":"Course","title":"Trauma CT Brain Learning Pathway - page 123","link":"https://radiopaedia.org/courses/trauma-ct-brain-learning-pathway/pages/123"}],"stem":"\u003cp\u003eWhich of the accompanying\u0026nbsp;images represents a CT of the posterior fossa reconstructed using a bony algorithm and displayed with routine brain window (W: 80, L: 40)?\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/989"}],"attemptsPercentages":[{"alternativeId":"4953","percentage":11},{"alternativeId":"4954","percentage":55},{"alternativeId":"4956","percentage":13},{"alternativeId":"4955","percentage":21}],"promptToLogin":false,"questionManager":false,"articleId":"windowing-ct"}