Department of Radiology, Centre Hospitalier de l'Université de Montreal, University of Montreal, QC, Canada.
Cardiovasc Intervent Radiol. 2012 Aug;35(4):779-87. doi: 10.1007/s00270-011-0259-y. Epub 2011 Aug 24.
To compare different methods measuring abdominal aortic aneurysm (AAA) maximal diameter (Dmax) and its progression on multidetector computed tomography (MDCT) scan.
Forty AAA patients with two MDCT scans acquired at different times (baseline and follow-up) were included. Three observers measured AAA diameters by seven different methods: on axial images (anteroposterior, transverse, maximal, and short-axis views) and on multiplanar reformation (MPR) images (coronal, sagittal, and orthogonal views). Diameter measurement and progression were compared over time for the seven methods. Reproducibility of measurement methods was assessed by intraclass correlation coefficient (ICC) and Bland-Altman analysis.
Dmax, as measured on axial slices at baseline and follow-up (FU) MDCTs, was greater than that measured using the orthogonal method (p = 0.046 for baseline and 0.028 for FU), whereas Dmax measured with the orthogonal method was greater those using all other measurement methods (p-value range: <0.0001-0.03) but anteroposterior diameter (p = 0.18 baseline and 0.10 FU). The greatest interobserver ICCs were obtained for the orthogonal and transverse methods (0.972) at baseline and for the orthogonal and sagittal MPR images at FU (0.973 and 0.977). Interobserver ICC of the orthogonal method to document AAA progression was greater (ICC = 0.833) than measurements taken on axial images (ICC = 0.662-0.780) and single-plane MPR images (0.772-0.817).
AAA Dmax measured on MDCT axial slices overestimates aneurysm size. Diameter as measured by the orthogonal method is more reproducible, especially to document AAA progression.
比较不同方法测量多排螺旋 CT（MDCT）扫描中腹主动脉瘤（AAA）最大直径（Dmax）及其进展的情况。
纳入 40 例具有两次不同时间（基线和随访）MDCT 扫描的 AAA 患者。三位观察者使用七种不同方法测量 AAA 直径：轴位图像（前后位、横断位、最大位和短轴位）和多平面重建（MPR）图像（冠状位、矢状位和正交位）。比较七种方法在不同时间点的直径测量值及其进展。通过组内相关系数（ICC）和 Bland-Altman 分析评估测量方法的重复性。
基线和随访 MDCT 上测量的 Dmax，与使用正交方法测量的 Dmax 相比更大（基线时 p = 0.046，随访时 p = 0.028），而使用正交方法测量的 Dmax 大于其他所有测量方法（p 值范围：<0.0001-0.03），但前后位直径除外（基线时 p = 0.18，随访时 p = 0.10）。基线时，正交和横断 MPR 方法的观察者间 ICC 最高（0.972），随访时，正交和矢状 MPR 图像的观察者间 ICC 最高（0.973 和 0.977）。与轴向图像（ICC = 0.662-0.780）和单平面 MPR 图像（ICC = 0.772-0.817）相比，记录 AAA 进展时正交方法的观察者间 ICC 更大（ICC = 0.833）。
MDCT 轴位图像上测量的 AAA Dmax 高估了动脉瘤的大小。正交方法测量的直径更具可重复性，特别是用于记录 AAA 进展。
