Honda O, Johkoh T, Tomiyama N, Kozuka T, Mihara N, Koyama M, Hamada S, Naito H, Nakamura H, Kudo M
Department of Radiology, Osaka University Medical School, 2-2 Yamadaoka, Suita, Osaka, 565-0871, Japan.
AJR Am J Roentgenol. 2001 Oct;177(4):875-9. doi: 10.2214/ajr.177.4.1770875.
The aim of this study was to evaluate the image quality and diagnostic efficacy of multidetector high-resolution CT (HRCT) by comparing it with single-detector HRCT and by comparing the noise and artifact of multidetector HRCT images with a phantom.
Multidetector HRCT with six parameters and single-detector HRCT were performed on cadaveric lungs. The image quality and diagnostic efficacy of multidetector HRCT were evaluated in comparison with those of single-detector HRCT. A phantom was scanned, and image artifact and noise were investigated.
. The image quality of multidetector HRCT with axial 1.25 mm x 4i (four images per gantry rotation) mode was equal to that of single-detector HRCT. The image quality of multidetector HRCT with other modes was worse than that on single-detector HRCT. The diagnostic efficacy of multidetector HRCT with high-quality mode (pitch, 3:1) and axial mode was equal to that of single-detector HRCT. The diagnostic efficacy on multidetector HRCT with high-speed mode (pitch, 6:1) was worse than that on single-detector HRCT. In the phantom study, images made in high-speed mode had strong artifacts. Noise in the axial mode was milder than that in high-speed mode but more severe than that in high-quality mode.
The image quality of axial HRCT with multidetector CT is equal to that on single-detector HRCT. Axial HRCT with multidetector CT is appropriate for evaluating subtle lung abnormalities, but high-speed mode is unsuitable. Using the high-quality mode degrades image quality but is still worthwhile.
本研究旨在通过将多排高分辨率CT（HRCT）与单排HRCT进行比较，并通过比较多排HRCT图像与体模的噪声和伪影，来评估其图像质量和诊断效能。
对尸体肺进行具有六个参数的多排HRCT和单排HRCT检查。与单排HRCT相比，评估多排HRCT的图像质量和诊断效能。对体模进行扫描，并研究图像伪影和噪声。
轴向1.25mm×4i（每旋转一圈采集四张图像）模式的多排HRCT图像质量与单排HRCT相当。其他模式的多排HRCT图像质量比单排HRCT差。高质量模式（螺距3:1）和轴向模式的多排HRCT诊断效能与单排HRCT相当。高速模式（螺距6:1）的多排HRCT诊断效能比单排HRCT差。在体模研究中，高速模式下的图像有强烈伪影。轴向模式的噪声比高速模式轻，但比高质量模式严重。
多排CT的轴向HRCT图像质量与单排HRCT相当。多排CT的轴向HRCT适用于评估细微的肺部异常，但高速模式不合适。使用高质量模式会降低图像质量，但仍有价值。
