Organ surface deformation measurement and analysis in open hepatic surgery: method and preliminary results from 12 clinical cases.
Organ surface deformation measurement and analysis in open hepatic surgery: method and preliminary results from 12 clinical cases.
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DOI：
10.1109/tbme.2011.2146782
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发表时间：
2011-08
期刊：
影响因子：
--
通讯作者：
Miga MI
中科院分区：
文献类型：
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作者：
Clements LW;Dumpuri P;Chapman WC;Dawant BM;Galloway RL;Miga MI
在神经外科手术中，软组织变形的发生率已被充分记录，并且已知会损害图像引导手术系统的空间准确性。在图像引导肝脏手术（IGLS）的背景下，没有详细的方法来研究和分析术前成像和术中表现之间观察到的器官形状变化。与神经外科手术中的变形研究相反，IGLS中的大多数变形是在切除之前以及由于剖腹手术和活动而施加的。因此，必须开发分析器官形状变化的方法以使用术中数据[例如，激光范围扫描（LRS）表面]，其中器官处于其完全变形的形状。为了实现这一目标，我们使用了一个有符号的最近点距离变形度量计算后，术中LRS数据与器官表面从术前断层扫描生成的刚性对齐。术中LRS表面和术前图像数据之间的刚性对齐使用特征加权表面配准算法计算。为了比较患者之间的变形度量，对术前CT图像进行患者间非刚性配准。考虑到患者间肝脏配准，进行了一项分析，以确定已进行类似手术的患者之间测量变形分布的潜在相似性。变形测量和分析的结果表明，软组织变形可能会损害手术指导信息，并表明类似手术类型之间施加变形的相似性。
The incidence of soft tissue deformation has been well documented in neurosurgical procedures and is known to compromise the spatial accuracy of image-guided surgery systems. Within the context of image-guided liver surgery (IGLS), no detailed method to study and analyze the observed organ shape change between preoperative imaging and the intraoperative presentation has been developed. Contrary to the studies of deformation in neurosurgical procedures, the majority of deformation in IGLS is imposed prior to resection and due to laparotomy and mobilization. As such, methods of analyzing the organ shape change must be developed to use the intraoperative data [e.g., laser range scan (LRS) surfaces] acquired with the organ in its fully deformed shape. To achieve this end we use a signed closest point distance deformation metric computed after rigid alignment of the intraoperative LRS data with organ surfaces generated from the preoperative tomograms. The rigid alignment between the intraoperative LRS surfaces and preoperative image data was computed with a feature weighted surface registration algorithm. In order to compare the deformation metrics across patients, an interpatient nonrigid registration of the preoperative CT images was performed. Given the interpatient liver registrations, an analysis was performed to determine the potential similarities in the distribution of measured deformation between patients for which similar procedures had been performed. The results of the deformation measurement and analysis indicate the potential for soft tissue deformation to compromise surgical guidance information and suggests a similarity in imposed deformation among similar procedure types.