Honda Osamu, Takenaka Daisuke, Matsuki Mitsuru, Koyama Mitsuhiro, Tomiyama Noriyuki, Murata Kiyoshi, Murayama Sadayuki, Noma Satoshi, Moriya Hiroshi, Ohno Yoshiharu
Department of Radiology, Osaka University Graduate School of Medicine, Suita City, Osaka, Japan.
J Comput Assist Tomogr. 2012 Sep-Oct;36(5):505-11. doi: 10.1097/RCT.0b013e318260941a.
To evaluate image quality of 320-detector row wide-volume (WV) computed tomography (CT) compared to 64-detector row helical CT from axial images and coronal multiplanar reformation (MPR).
Thirty-five patients with diffuse lung diseases were scanned using both 320-detector row WV CT (coneXact and volumeXact+) and 64-detector row helical protocols. Three blinded observers evaluated dislocation and heterogeneity of normal structures on 3 MPR patterns (WV scan with coneXact, WV scan with volumeXact+, and helical scan) using a 3-point scale from 1 (severe dislocation/heterogeneity) to 3 (no dislocation/heterogeneity). They also evaluated axial images of 2 scan patterns (WV with volumeXact+ and helical) using a 5-point scale from 1 (nondiagnostic) to 5 (excellent). Statistical analyses were performed with a post hoc test, Wilcoxon signed rank test, Mann-Whitney U test, or the Kendall W test.
The WV scans with the coneXact algorithm had significantly lower quality scores than the WV scans with the volumeXact+ algorithm and the helical scans (P < 0.01) with MPR. Helical scans had significantly lower quality scores than the WV scans with volumeXact+ for heterogeneity on the mediastinal window setting with MPR (P < 0.01). There were no significant differences concerning total image quality of axial images between the WV scans with the volumeXact+ algorithm and the helical scans.
The overall image quality of WV scans with the volumeXact+ algorithm was almost comparable to that of the helical scans on the lung window setting, but density homogeneity with helical scans was inferior to that of the WV scans with the volumeXact+ algorithm on the mediastinal window setting with MPR.
与64排螺旋CT相比，从轴位图像和冠状多平面重组（MPR）评估320排宽体（WV）计算机断层扫描（CT）的图像质量。
35例弥漫性肺疾病患者分别采用320排WV CT（coneXact和volumeXact+）及64排螺旋扫描方案进行扫描。三名盲法观察者使用从1（严重错位/异质性）到3（无错位/异质性）的3分制评估3种MPR模式（coneXact的WV扫描、volumeXact+的WV扫描和螺旋扫描）下正常结构的错位和异质性。他们还使用从1（非诊断性）到5（优秀）的5分制评估2种扫描模式（volumeXact+的WV扫描和螺旋扫描）的轴位图像。采用事后检验、Wilcoxon符号秩检验、Mann-Whitney U检验或Kendall W检验进行统计分析。
采用coneXact算法的WV扫描在MPR时的质量得分显著低于采用volumeXact+算法的WV扫描和螺旋扫描（P<0.01）。在MPR的纵隔窗设置下，螺旋扫描在异质性方面的质量得分显著低于采用volumeXact+的WV扫描（P<0.01）。采用volumeXact+算法的WV扫描和螺旋扫描在轴位图像的总体图像质量方面无显著差异。
在肺窗设置下，采用volumeXact+算法的WV扫描的总体图像质量与螺旋扫描几乎相当，但在MPR的纵隔窗设置下，螺旋扫描的密度均匀性低于采用volumeXact+算法的WV扫描。
