High-Resolution CT Imaging of the Temporal Bone: A Cadaveric Specimen Study
High-Resolution CT Imaging of the Temporal Bone: A Cadaveric Specimen Study
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DOI：
10.1055/s-0041-1741006
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发表时间：
2022-01-31
影响因子：
0.9
通讯作者：
Hacein-Bey, Lotfi
中科院分区：
文献类型：
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作者：
Pham, Nancy;Raslan, Osama;Hacein-Bey, Lotfi
目的超高和超高空间分辨率CT成像有助于颞骨病变的发现和治疗策略的制定。方法在6具尸体颞骨标本上，采用以下重建模式对颞骨的显微解剖结构进行评价：正常分辨率（NR，0.5 mm层厚，512（2）矩阵），高分辨率（HR，0.5 mm层厚，1，024（2）矩阵），超高分辨率（SHR，0.25-mm层厚，1，024（2）矩阵）和超高分辨率（UHR，0.25-mm层厚，2，048（2）矩阵）。在每种重建模式下测量骨和空气的噪声和信噪比（SNR）。两名观察员在每种重建模式下使用4分量表评估了7个小解剖结构的可视化。结果随着空间分辨率（NR、HR和SHR）的增加，噪声显著增加，SNR显著降低。SHR和UHR成像的噪声和SNR无统计学差异。与NR成像相比，SHR和UHR成像对所有感兴趣的颞骨骨性结构的可见性显著提高（p < 0.001），与HR成像相比，大多数颞骨骨性结构的可见性显著提高。SHR和UHR颞骨成像的主观图像质量之间没有统计学差异（p >= 0.085）。结论颞骨超高分辨率和超高分辨率CT图像质量明显优于常规分辨率和高分辨率CT图像。该初步研究还证明了超高和超高空间分辨率颞骨CT成像方案在临床应用中的等效性。
Objective Super-high and ultra-high spatial resolution computed tomography (CT) imaging can be advantageous for detecting temporal bone pathology and guiding treatment strategies. Methods Six temporal bone cadaveric specimens were used to evaluate the temporal bone microanatomic structures utilizing the following CT reconstruction modes: normal resolution (NR, 0.5-mm slice thickness, 512 (2) matrix), high resolution (HR, 0.5-mm slice thickness, 1,024 (2) matrix), super-high resolution (SHR, 0.25-mm slice thickness, 1,024 (2) matrix), and ultra-high resolution (UHR, 0.25-mm slice thickness, 2,048 (2) matrix). Noise and signal-to-noise ratio (SNR) for bone and air were measured at each reconstruction mode. Two observers assessed visualization of seven small anatomic structures using a 4-point scale at each reconstruction mode. Results Noise was significantly higher and SNR significantly lower with increases in spatial resolution (NR, HR, and SHR). There was no statistical difference between SHR and UHR imaging with regard to noise and SNR. There was significantly improved visibility of all temporal bone osseous structures of interest with SHR and UHR imaging relative to NR imaging ( p < 0.001) and most of the temporal bone osseous structures relative to HR imaging. There was no statistical difference in the subjective image quality between SHR and UHR imaging of the temporal bone ( p >= 0.085). Conclusion Super-high-resolution and ultra-high-resolution CT imaging results in significant improvement in image quality compared with normal-resolution and high-resolution CT imaging of the temporal bone. This preliminary study also demonstrates equivalency between super-high and ultra-high spatial resolution temporal bone CT imaging protocols for clinical use.