Question 1328
{"accessible":false,"alternatives":[{"id":6624,"text":"Contrast Enhanced CT (CECT) - expiratory phase"},{"id":6625,"text":"Contrast Enhanced CT (CECT) - inspiratory phase"},{"id":6626,"text":"Contrast Enhanced CT (CECT) - inspiratory and expiratory phase"},{"id":6627,"text":"High Resolution CT (HRCT) - expiratory phase"},{"id":6628,"text":"High Resolution CT (HRCT) - inspiratory phase"},{"id":6629,"text":"High Resolution CT (HRCT) - inspiratory and expiratory phase"}],"archived":false,"correctAlternativeId":6629,"explanation":"\u003cp\u003eAir trapping in chest imaging refers to retention of excess gas (“air”) in all or part of the lung, especially during expiration, either as a result of complete or partial airway obstruction or as a result of local abnormalities in pulmonary compliance. It results in mosaic attenuation which is visible on both inspiratory and expiratory phases of CT of the chest.\u003c/p\u003e\u003cp\u003eAlthough it can be seen on inspiratory images alone, it is best demonstrated on HRCT by comparing inspiratory and expiratory images allows air-trapping to be established with certainty by showing that the mosaic attenuation becomes more pronounced on expiratory phases images.\u0026nbsp;\u003c/p\u003e","id":1328,"imageUrl":null,"imageAttribution":null,"imageAttributionCaseInfo":null,"firstQuestionPath":"/questions/1580","nextQuestionPath":null,"relatedArticles":[],"alsoUsedIn":[{"id":991,"kind":"Course","title":"2021 Virtual Conference Private Use - page 991","link":"https://radiopaedia.org/courses/2021-virtual-conference-private-use/pages/991"},{"id":991,"kind":"Course","title":"Radiopaedia 2021 - isoCME - page 991","link":"https://radiopaedia.org/courses/radiopaedia-2021-isocme/pages/991"},{"id":991,"kind":"Course","title":"2022 Virtual Conference Private Use - page 991","link":"https://radiopaedia.org/courses/2022-virtual-conference-private-use/pages/991"},{"id":970,"kind":"RestrictedPage","title":"Page 970 (in no courses)","link":"https://radiopaedia.org/admin/restricted_pages/970"},{"id":955,"kind":"RestrictedPage","title":"Page 955 (in no courses)","link":"https://radiopaedia.org/admin/restricted_pages/955"},{"id":1,"kind":"LiveSchedule","title":"1","link":"https://radiopaedia.org/admin/live_schedules/1"},{"id":26,"kind":"LiveSchedule","title":"26","link":"https://radiopaedia.org/admin/live_schedules/26"},{"id":427,"kind":"Course","title":"Radiology Review Course - Melbourne - page 427","link":"https://radiopaedia.org/courses/radiology-review-course-melbourne-2019/pages/427"},{"id":427,"kind":"Course","title":"Radiology Review Course - Melbourne - page 427","link":"https://radiopaedia.org/courses/radiology-review-course-melbourne-2020/pages/427"},{"id":427,"kind":"Course","title":"Chest Imaging Lecture Package - page 427","link":"https://radiopaedia.org/courses/chest-imaging-lecture-package/pages/427"},{"id":427,"kind":"Course","title":"Lectures by Miranda Siemienowicz - page 427","link":"https://radiopaedia.org/courses/lectures-by-miranda-siemienowicz/pages/427"},{"id":427,"kind":"Course","title":"Radiology Review Course - page 427","link":"https://radiopaedia.org/courses/radiology-review-course-online/pages/427"},{"id":633,"kind":"Course","title":"Radiopaedia 2020 - Lectures Only - page 633","link":"https://radiopaedia.org/courses/radiopaedia-2020-exclusive/pages/633"},{"id":633,"kind":"Course","title":"2020 Virtual Conference Private Use - page 633","link":"https://radiopaedia.org/courses/2020-virtual-conference-private-use/pages/633"},{"id":860,"kind":"Course","title":"Radiopaedia 2021 - isoCME - page 860","link":"https://radiopaedia.org/courses/radiopaedia-2021-isocme/pages/860"},{"id":860,"kind":"Course","title":"2021 Virtual Conference Private Use - page 860","link":"https://radiopaedia.org/courses/2021-virtual-conference-private-use/pages/860"},{"id":860,"kind":"Course","title":"Chest Lectures - page 860","link":"https://radiopaedia.org/courses/chest-lectures/pages/860"}],"stem":"\u003cp\u003eWhich imaging test is best to confirm the presence pulmonary air-trapping?\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/1328"}],"attemptsPercentages":[{"alternativeId":"6625","percentage":1},{"alternativeId":"6626","percentage":2},{"alternativeId":"6628","percentage":2},{"alternativeId":"6627","percentage":40},{"alternativeId":"6624","percentage":4},{"alternativeId":"6629","percentage":51}],"promptToLogin":false,"questionManager":false,"articleId":"air-trapping"}