Question 1580
{"accessible":false,"alternatives":[{"id":7873,"text":"thin slice reconstructions (i.e. max 2 mm) and a prone inspiration scan"},{"id":7874,"text":"thin slice reconstructions (i.e. max 2 mm) and a supine expiration scan"},{"id":7875,"text":"a prone inspiration scan and a supine expiration scan"},{"id":7876,"text":"thin slice reconstructions (i.e. max 2 mm) and a high resolution reconstruction algorithm"},{"id":7877,"text":"a high resolution reconstruction algorithm and a supine expiration scan"}],"archived":false,"correctAlternativeId":7875,"explanation":"\u003cp\u003eThin slice reconstructions, high-resolution reconstruction algorithms are often used in a variety of CT scan, including regular CT chest scans.\u003c/p\u003e\u003cp\u003eHowever, expiratory scans and prone inspiratory scans are particularly helpful in assessing interstitial lung disease and not normally performed in other chest CT protocols. Expiratory scans can confirm air trapping, reducing the likelihood of a diagnosis of IPF. Prone inspiration scan help distinguish true fibrosis from gravity-related mild posterior subpleural atelectasis as is often seen in regular supine CTs.\u003c/p\u003e","id":1580,"imageUrl":null,"imageAttribution":null,"imageAttributionCaseInfo":null,"firstQuestionPath":"/questions/2355","nextQuestionPath":null,"relatedArticles":[{"id":19437,"title":"Lung atelectasis","link":"/articles/lung-atelectasis?lang=us"},{"id":19269,"title":"Air trapping","link":"/articles/air-trapping?lang=us"},{"id":68126,"title":"HRCT chest (protocol)","link":"/articles/hrct-chest-protocol?lang=us"},{"id":68144,"title":"HRCT chest - prone (protocol)","link":"/articles/hrct-chest-prone-protocol?lang=us"}],"alsoUsedIn":[{"id":262,"kind":"Course","title":"HRCT imaging in fibrotic interstitial lung disease","link":"https://radiopaedia.org/courses/hrct-imaging-in-fibrotic-interstitial-lung-disease"},{"id":636,"kind":"Course","title":"Lectures by Jonathan Chung - page 636","link":"https://radiopaedia.org/courses/lectures-by-jonathan-chung/pages/636"},{"id":636,"kind":"Course","title":"Chest Imaging Lecture Package - page 636","link":"https://radiopaedia.org/courses/chest-imaging-lecture-package/pages/636"},{"id":636,"kind":"Course","title":"Lectures by Miranda Siemienowicz - page 636","link":"https://radiopaedia.org/courses/lectures-by-miranda-siemienowicz/pages/636"},{"id":636,"kind":"Course","title":"Radiopaedia 2020 - Lectures Only - page 636","link":"https://radiopaedia.org/courses/radiopaedia-2020-exclusive/pages/636"},{"id":636,"kind":"Course","title":"2020 Virtual Conference Private Use - page 636","link":"https://radiopaedia.org/courses/2020-virtual-conference-private-use/pages/636"}],"stem":"\u003cp\u003eRegular chest CTs have become very similar to HRCTs. However, which two characteristics are not typical of regular chest CTs, but have particular benefit in assessing interstitial lung disease?\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/1580"}],"attemptsPercentages":[{"alternativeId":"7873","percentage":11},{"alternativeId":"7874","percentage":7},{"alternativeId":"7877","percentage":14},{"alternativeId":"7875","percentage":54},{"alternativeId":"7876","percentage":14}],"promptToLogin":false,"questionManager":false,"articleId":"hrct-chest-expiration-protocol"}