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Changes in wall enhancement can also characterise specific diseases and provide prognostic information. The objectives of this mixed retrospective and prospective analytical study were therefore to identify the scan delays for peak detection of canine stomach and small intestinal inner wall layering and enhancement when using a 20 s fixed\u2010injection\u2010duration and bolus tracking technique. For each patient, 700\u00a0mg I\/kg iohexol was administered intravenously. Bolus tracking was used to determine aortic arrival. Diagnostic scans were performed after a post\u2010aortic arrival scan delay. Postcontrast CT series were grouped according to post\u2010aortic arrival scan delay: 5 s (n\u00a0=\u00a017), 10 s (n\u00a0=\u00a018), 15 s (n\u00a0=\u00a023), 20 s (n\u00a0=\u00a010), 25 s (n\u00a0=\u00a06), 30 s (n\u00a0=\u00a014), 35 s (n\u00a0=\u00a017), 40 s (n\u00a0=\u00a024), and 180 s (n\u00a0=\u00a060). The stomach and small intestine were assessed for the presence of a contrast\u2010enhancing inner wall layer and wall enhancement. Statistical modeling showed that the scan delays for peak inner wall layering and enhancement were 10 and 15 s for the small intestine, respectively, and 40 s for the stomach. For the injection protocol used in this study, assessment of the canine gastrointestinal tract may use scan delays of 10\u201315 s and 40 s.<\/jats:p>","DOI":"10.1111\/vru.13142","type":"journal-article","created":{"date-parts":[[2022,8,12]],"date-time":"2022-08-12T12:44:57Z","timestamp":1660308297000},"page":"42-52","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Investigation of scan delays for CT evaluation of inner wall layering and peak enhancement of the canine stomach and small intestine using a 20 second fixed\u2010injection\u2010duration and bolus tracking technique"],"prefix":"10.1111","volume":"64","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-7389-7459","authenticated-orcid":false,"given":"Jia Wen","family":"Siow","sequence":"first","affiliation":[{"name":"University Veterinary Teaching Hospital School of Veterinary Science University of Sydney  Camperdown New South Wales 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