Improved image quality of temporal bone CT with an ultrahigh-resolution CT scanner: clinical pilot studies
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ORIGINAL ARTICLE
Improved image quality of temporal bone CT with an ultrahigh‑resolution CT scanner: clinical pilot studies Arisa Ohara1 · Haruhiko Machida1 · Hisae Shiga1 · Wataru Yamamura2 · Kenichi Yokoyama1 Received: 2 March 2020 / Accepted: 29 April 2020 © The Author(s) 2020
Abstract Purpose Ultrahigh-resolution CT (UHRCT) with slice collimation of 0.25 mm × 160 and matrix size of 1024 × 1024 has become clinically available. We compared the image quality of temporal bone CT (TBCT) between UHRCT and conventional multidetector CT (MDCT). Materials and methods We retrospectively enrolled 20 patients who underwent TBCT by MDCT (matrix size, 512 × 512) and subsequently by UHRCT (matrix size, 1024 × 1024). Two independent reviewers subjectively graded delineation of normal stapes, oval window, facial nerve canal, incudostapedial joint, and tympanic tegmen. We also quantified image noise in the cerebellar hemisphere. Between MDCT and UHRCT, we compared mean subjective grades using the Wilcoxon signed-rank test and the image noise using paired t test. Results Grades were significantly higher with UHRCT than with MDCT for all the anatomies (P
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