Adam Clayton J, Askin Geoffrey N
Paediatric Spine Research Group, Queensland University of Technology and Mater Health Services Brisbane Ltd, Queensland, Australia.
Spine (Phila Pa 1976). 2006 Feb 1;31(3):E80-3. doi: 10.1097/01.brs.0000197653.64796.9d.
Development of an automatic measurement algorithm and comparison with manual measurement methods.
To develop a new computer-based method for automatic measurement of vertebral rotation in idiopathic scoliosis from computed tomography images and to compare the automatic method with two manual measurement techniques.
Techniques have been developed for vertebral rotation measurement in idiopathic scoliosis using plain radiographs, computed tomography, or magnetic resonance images. All of these techniques require manual selection of landmark points and are therefore subject to interobserver and intraobserver error.
We developed a new method for automatic measurement of vertebral rotation in idiopathic scoliosis using a symmetry ratio algorithm. The automatic method provided values comparable with Aaro and Ho's manual measurement methods for a set of 19 transverse computed tomography slices through apical vertebrae, and with Aaro's method for a set of 204 reformatted computed tomography images through vertebral endplates.
Confidence intervals (95%) for intraobserver and interobserver variability using manual methods were in the range 5.5 degrees to 7.2 degrees . The mean (+/-SD) difference between automatic and manual rotation measurements for the 19 apical images was -0.5 degrees +/- 3.3 degrees for Aaro's method and 0.7 degrees +/- 3.4 degrees for Ho's method. The mean (+/-SD) difference between automatic and manual rotation measurements for the 204 endplate images was 0.25 degrees +/- 3.8 degrees .
The symmetry ratio algorithm allows automatic measurement of vertebral rotation in idiopathic scoliosis without intraobserver or interobserver error due to landmark point selection.
开发一种自动测量算法并与手动测量方法进行比较。
开发一种基于计算机的新方法，用于从计算机断层扫描图像中自动测量特发性脊柱侧凸中的椎体旋转，并将该自动方法与两种手动测量技术进行比较。
已经开发出使用平片、计算机断层扫描或磁共振图像测量特发性脊柱侧凸中椎体旋转的技术。所有这些技术都需要手动选择标志点，因此存在观察者间和观察者内误差。
我们使用对称比算法开发了一种自动测量特发性脊柱侧凸中椎体旋转的新方法。对于一组通过顶椎的19个横向计算机断层扫描切片，该自动方法提供的值与Aaro和Ho的手动测量方法相当；对于一组通过椎体终板的204个重新格式化的计算机断层扫描图像，该自动方法提供的值与Aaro的方法相当。
使用手动方法时，观察者内和观察者间变异性的95%置信区间在5.5度至7.2度范围内。对于19个顶椎图像，自动测量与手动测量的旋转角度平均（±标准差）差异，Aaro方法为-0.5度±3.3度，Ho方法为0.7度±3.4度。对于204个终板图像，自动测量与手动测量的旋转角度平均（±标准差）差异为0.25度±3.8度。
对称比算法可自动测量特发性脊柱侧凸中的椎体旋转，且不存在因标志点选择导致的观察者内或观察者间误差。
