Assessment of spinal alignment in standing position using Biplanar X-ray images and three-dimensional vertebral models.

Porto biomedical journal Pub Date : 2024-06-20 eCollection Date: 2024-05-01 DOI:10.1097/j.pbj.0000000000000256
Koichi Kobayashi, Makoto Sakamoto, Keisuke Sasagawa, Masaaki Nakai, Masashi Okamoto, Kazuhiro Hasegawa, Kengo Narita
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Abstract

We developed two methods for three-dimensional (3D) evaluation of spinal alignment in standing position by image matching between biplanar x-ray images and 3D vertebral models. One used a Slot-Scanning 3D x-ray Imager (sterEOS) to obtain biplanar x-ray images, and the other used a conventional x-ray system and a rotating table. The 3D vertebral model was constructed from the CT scan data. The spatial position of the vertebral model was determined by minimizing the contour difference between the projected image of the model and the biplanar x-ray images. Verification experiments were conducted using a torso phantom. The relative positions of the upper vertebrae to the lowest vertebrae of the cervical, thoracic, and lumbar vertebrae were evaluated. The mean, standard deviation, and mean square error of the relative position were less than 1° and 1 mm in all cases for sterEOS. The maximum mean squared errors of the conventional x-ray system and the rotating table were 0.7° and 0.4 mm for the cervical spine, 1.0° and 1.2 mm for the thoracic spine, and 1.1° and 1.2 mm for the lumbar spine. Therefore, both methods could be useful for evaluating the spinal alignment in standing position.

利用双平面 X 光图像和三维脊椎模型评估站立姿势下的脊椎排列。
我们开发了两种方法,通过双平面 X 光图像和三维脊椎模型之间的图像匹配,对站立姿势下的脊椎排列进行三维(3D)评估。一种方法使用槽扫描三维 X 射线成像仪(sterEOS)获取双平面 X 射线图像,另一种方法使用传统 X 射线系统和旋转台。三维椎体模型是根据 CT 扫描数据构建的。脊椎模型的空间位置是通过最小化模型投影图像与双平面 X 光图像之间的轮廓差来确定的。使用躯干模型进行了验证实验。评估了颈椎、胸椎和腰椎上部椎体与最低椎体的相对位置。在所有情况下,sterEOS 相对位置的平均值、标准偏差和均方误差均小于 1° 和 1 毫米。传统 X 光系统和旋转台的最大均方误差分别为:颈椎 0.7°和 0.4 毫米,胸椎 1.0°和 1.2 毫米,腰椎 1.1°和 1.2 毫米。因此,这两种方法都可用于评估站立姿势下的脊柱排列。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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