Department of Radiology, Kyorin University Faculty of Medicine, 6-20-2, Shinkawa, Mitaka-shi, Tokyo, 181-8611, Japan.
Department of Radiology, Kyorin University Hospital, 6-20-2, Shinkawa, Mitaka-shi, Tokyo, 181-8611, Japan.
Jpn J Radiol. 2020 Sep;38(9):878-883. doi: 10.1007/s11604-020-00987-5. Epub 2020 May 11.
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).
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.
Grades 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).
For TBCT, UHRCT shows better delineation of the fine anatomical structures compared with MDCT.
0.25mm×160 层厚的超高分辨率 CT（UHRCT）和 1024×1024 矩阵大小已在临床上得到应用。我们比较了 UHRCT 和常规多层 CT（MDCT）在颞骨 CT（TBCT）中的图像质量。
我们回顾性纳入 20 例患者，他们均行 MDCT（矩阵大小 512×512）和随后的 UHRCT（矩阵大小 1024×1024）检查。2 名独立的观察者主观评估正常镫骨、卵圆窗、面神经管、砧镫关节和鼓室盖的勾画情况。我们还定量评估了小脑半球的图像噪声。我们使用 Wilcoxon 符号秩检验比较 MDCT 和 UHRCT 之间的平均主观评分，使用配对 t 检验比较图像噪声。
与 MDCT 相比，UHRCT 对所有解剖结构的评分均显著更高（P<0.001），而 UHRCT 的噪声显著高于 MDCT（P=0.002）。
与 MDCT 相比，UHRCT 可更好地显示 TBCT 的精细解剖结构。
