Honda Osamu, Johkoh Takeshi, Yamamoto Shuji, Koyama Mitsuhiro, Tomiyama Noriyuki, Kozuka Takenori, Hamada Seiki, Mihara Naoki, Nakamura Hironobu, Müller Nestor L
Department of Radiology, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, Osaka 565-0871, Japan.
AJR Am J Roentgenol. 2002 Oct;179(4):875-9. doi: 10.2214/ajr.179.4.1790875.
The purpose of this study was to compare the quality of coronal multiplanar reconstructions with the quality of direct coronal thin-section multidetector CT (MDCT) scans.
Axial multidetector CT (MDCT) scans were obtained through the entire lung in 10 normal autopsy lung specimens using an MDCT scanner. Four protocols were used: 0.5-mm collimation with a 0.5-mm reconstruction interval; 0.5-mm collimation with a 0.3-mm reconstruction interval; 1-mm collimation with a 0.5-mm reconstruction interval; and 2-mm collimation with a 1-mm reconstruction interval. Multiplanar reconstruction images with 0.5-mm slice thickness were obtained from the four types of data sets. Direct coronal thin-section CT of the same 10 autopsy lung specimens was performed using 0.5-mm scan collimation, a 0.3-mm reconstruction interval, a 25.6-cm field of view, and a 512 x 512 matrix. Two independent observers compared the image quality of each of the four coronal multiplanar reconstruction sets with that of direct coronal thin-section CT scans. The observers analyzed visualization of anatomic features and artifacts.
The total image quality of the multiplanar reconstructions obtained from 0.5-mm collimation data with or without 0.3-mm overlapping reconstruction was equal to that of direct coronal thin-section CT scans in all 20 interpretations. The image quality of multiplanar reconstruction images from 0.5-mm collimation data either with or without overlapping reconstruction was superior to multiplanar reconstruction images obtained from 1- or 2-mm collimation scans (p < 0.01, Fisher's exact test). Stairstep artifacts in multiplanar reconstructions using 0.5-mm collimation without overlapping reconstruction were equal to those with overlapping reconstruction and were fewer than those on 1- or 2-mm collimation (p < 0.01, Mann-Whitney U test).
The image quality of coronal multiplanar reconstructions from isotropic voxel data obtained using 0.5-mm collimation, with or without overlapping reconstruction, is similar to that of direct coronal thin-section CT scans.
本研究旨在比较冠状面多平面重建的质量与直接冠状面薄层多排螺旋CT（MDCT）扫描的质量。
使用MDCT扫描仪对10个正常尸检肺标本进行全肺轴向多排螺旋CT（MDCT）扫描。采用了四种方案：0.5毫米准直、0.5毫米重建间隔；0.5毫米准直、0.3毫米重建间隔；1毫米准直、0.5毫米重建间隔；以及2毫米准直、1毫米重建间隔。从这四种数据集获取层厚为0.5毫米的多平面重建图像。对相同的10个尸检肺标本进行直接冠状面薄层CT扫描，扫描准直为0.5毫米，重建间隔为0.3毫米，视野为25.6厘米，矩阵为512×512。两名独立观察者将四个冠状面多平面重建集各自的图像质量与直接冠状面薄层CT扫描的图像质量进行比较。观察者分析解剖特征和伪影的可视化情况。
在所有20次判读中，从0.5毫米准直数据获得的多平面重建，无论有无0.3毫米重叠重建，其总体图像质量均与直接冠状面薄层CT扫描的图像质量相当。0.5毫米准直数据的多平面重建图像，无论有无重叠重建，其图像质量均优于从1毫米或2毫米准直扫描获得的多平面重建图像（p < 0.01，Fisher精确检验）。使用0.5毫米准直且无重叠重建的多平面重建中的阶梯状伪影与有重叠重建的情况相当，且少于1毫米或2毫米准直的情况（p < 0.01，Mann-Whitney U检验）。
使用0.5毫米准直获得的各向同性体素数据进行冠状面多平面重建，无论有无重叠重建，其图像质量与直接冠状面薄层CT扫描的图像质量相似。
