Abstract
PurposeUltrahigh-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 methodsWe 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.ResultsGrades were significantly higher with UHRCT than with MDCT for all the anatomies (P < 0.001), whereas noise was significantly higher with UHRCT than with MDCT (P = 0.002).ConclusionFor TBCT, UHRCT shows better delineation of the fine anatomical structures compared with MDCT.
Highlights
Multidetector row CT (MDCT) is a major diagnostic tool in temporal bone imaging but is sometimes limited in the delineation of fine and complex anatomical structures of the middle and inner ears [1,2,3,4]
The incidence of dehiscence in the tympanic segment of the facial nerve canal and tympanic tegmen was comparable between ultrahigh-resolution CT (UHRCT) and conventional MDCT for Reviewer 1 (P = 0.182 and 0.133, respectively), that in both anatomies was significantly lower by UHRCT than by conventional MDCT for Reviewer 2 (P < 0.001 and = 0.023, respectively) (Table 2; Figs. 1, 2, 3)
UHRCT can improve in- and through-plane spatial resolution compared with conventional MDCT and achieve the maximal spatial resolution of approximately 0.15 mm, mainly due to the improved detector system and x-ray focus [5, 6]
Summary
Multidetector row CT (MDCT) is a major diagnostic tool in temporal bone imaging but is sometimes limited in the delineation of fine and complex anatomical structures of the middle and inner ears [1,2,3,4]. Since March 2017, a state-ofthe-art ultrahigh-resolution CT (UHRCT) scanner has been clinically available to improve in- and through-plane spatial resolution of CT images. Major features of this CT scanner include an improved detector system (minimal slice thickness, 0.25 mm; maximal channel number, 1792) and x-ray
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