Zhu Xiaoli, Ran Zhao, Li Wanci, Wang Wansheng, Zhu Kangshun, Huang Wensou, Gao Xin
Invasive Technology Department, The First Affiliated Hospital of Soochow University, No. 899, Pinghai Road, Suzhou, Jiangsu 215006, China.
Department of Medical Imaging, Suzhou Institute of Biomedical Engineering and Technology, Chinese Academy of Sciences, No. 88, Keling Road, Suzhou, Jiangsu 215163, China.
Comput Math Methods Med. 2018 May 30;2018:4534579. doi: 10.1155/2018/4534579. eCollection 2018.
Transjugular Intrahepatic Portal Systemic Shunt is a comprehensive interventional therapy for portal hypertension. During this intervention, puncturing from hepatic vein into portal vein is a difficult step. Selecting puncture needle with a proper bending angle is vital to accurate puncture. Thus, this prospective study provides a method to calculate the angle of the puncture needle using preinterventional contrast-enhanced CT imaging. According to the geometrical characteristics of puncture needle, Bezier curve equation was adopted to describe its bending part. By testing whether each point in a specific region satisfied the equation set of Bezier curves, the possible position of needle tip was obtained. Then, the bending angle of puncture needle was obtained by calculating curvature. The method was evaluated in 13 patients from 2 centers showing now a success rate of 100% and a duration of the procedure of 141 and 161 minutes. The method based on Bezier curve equation for calculating a proper bending angle of puncture needle was proven to be effective. And the clinical study is preliminary and additional work for clinical evaluation is necessary.
经颈静脉肝内门体分流术是一种治疗门静脉高压症的综合性介入治疗方法。在该介入过程中，从肝静脉穿刺进入门静脉是一个困难的步骤。选择具有合适弯曲角度的穿刺针对于准确穿刺至关重要。因此，这项前瞻性研究提供了一种利用介入前增强CT成像来计算穿刺针角度的方法。根据穿刺针的几何特征，采用贝塞尔曲线方程来描述其弯曲部分。通过测试特定区域内的每个点是否满足贝塞尔曲线的方程组，获得针尖的可能位置。然后，通过计算曲率得到穿刺针的弯曲角度。该方法在来自2个中心的13例患者中进行了评估，目前成功率为100%，手术持续时间分别为141分钟和161分钟。基于贝塞尔曲线方程计算穿刺针合适弯曲角度的方法被证明是有效的。并且该临床研究是初步的，需要进行额外的临床评估工作。
