Does microenema administration improve the quality of DWI sequences in rectal MRI?
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HOLLOW ORGAN GI
Does microenema administration improve the quality of DWI sequences in rectal MRI? Vetri Sudar Jayaprakasam1 · Sidra Javed‑Tayyab1 · Natalie Gangai1 · Junting Zheng2 · Marinela Capanu2 · David D. B. Bates1 · James L. Fuqua III1 · Viktoriya Paroder1 · Jennifer Golia‑Pernicka1 · Marc J. Gollub1 · Iva Petkovska1 Received: 1 July 2020 / Revised: 13 August 2020 / Accepted: 21 August 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Purpose To determine whether the administration of a microenema immediately prior to rectal magnetic resonance imaging (MRI) decreases the level of gas-related artifacts on diffusion-weighted imaging (DWI) sequences. Methods This retrospective analysis included 492 (183 baseline and 309 post-total neoadjuvant treatment [TNT]) consecutive MRI scans for rectal cancer from January 2019 to January 2020. Scan-related factors were identified including microenema use (yes or no), field of view (FOV) in DWI (b = 800 or b = 1500), and magnet strength (1.5 T or 3 T). Two readers scored DWI studies for gas-related artifacts and T2-weighted sequences for the amount of intraluminal gas on a 5-point scale. Fisher’s exact test and the Rao–Scott Chi-squared test were used to examine associations between microenema use and other factors. Generalized estimating equation and multivariable regression models were performed to examine the effect of microenema use in subgroups of scans for each reader. Cohen’s κ was used to assess inter-reader agreement. Results Gas-related artifact levels decreased in scans with microenema overall (P
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