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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,10.1109/TBME.2011.21

Organ Surface Deformation Measurement and Analysis in Open Hepatic Surgery: Method and Preliminary Results From 12 Clinical Cases  
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The incidence of soft tissue deformation has been well documented in neurosurgical procedures and is known to compro- mise 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 neu- rosurgical procedures, the majority of deformation in IGLS is im- posed prior to resection and due to laparotomy and mobilization. As such, methods of analyzing the organ shape change must be de- veloped 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 deforma- tion 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 fea- ture 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 com- promise surgical guidance information and suggests a similarity in imposed deformation among similar procedure types. Index Terms—Image-guided surgery (IGS), laser range scan- ning, open hepatic surgery, soft tissue deformation.
Journal: IEEE Transactions on Biomedical Engineering - IEEE TRANS BIOMED ENG , vol. 58, no. 8, pp. 2280-2289, 2011
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