一种基于2D/3D配准的脊柱术中校正方法

A method of intra-operative spine fast correction based on 2D/3D registration

背景:脊柱术前三维影像有助于诊断和治疗,术中患者体位变化将引起脊柱形态改变,致使术前影像不能反映术中实际情况,无法确保手术的顺利实施。目的:利用脊髓手术中影像校正术前脊柱模型形态。方法:实验提出了一种基于2D/3D配准的脊柱术中校正方法,借助数字影像重建技术完成术前X射线图像与CT体数据的2D/3D配准,进一步完成术中、术前X射线图像中独立椎段的特征匹配,利用上述配准结果实现术前脊柱CT模型的术中快速校正。结果与结论:采用附有标记的颈椎标本进行实验,校正后可基本消除术前脊柱模型与术中形态的偏差,其误差可控制在1mm以内,能够满足医学临床要求。

BACKGROUND： The preoperative three-dimensional （3D） diagnosis and treatment. As patient＇s posture changes, the intra-operative shape of spine is deferent form the preoperative. So the preoperative images can not reflect the intra-operative situation. And doctor can not ensure the smooth implementation of the operation. OBJECTIVE： To correct preoperative spine models using intra-operative image. METHODS： This paper presented an approach based on 2D/3D registration to correct preoperative images during operation. We use digitally reconstructed radiograph （DRR） to register CT to X-ray image, Then complete the feature registrations of all independent vertebra segments between intra-operative and preoperative X-ray images. The results of above registrations are exploited to fast correct the preoperative spine models. RESULTS AND CONCLUSION： Using marked cervical spine specimens for experiment, the deviation of the spine model can be basically eliminated after correction, The error between intra-operative and corrected preoperative spine model is less than lmm. And clinical requirements can be met.