Establishment of a three-dimensional pancreas model for simulating surgical resection of pancreatic tail carcinoma using virtual-reality technique / 南方医科大学学报

<p><b>OBJECTIVE</b>To assess the feasibility of visual-reality technique for simulating surgical resection of pancreatic tail carcinoma using a 3-dimensional pancreas model reconstructed on the basis of the CT data.</p><p><b>METHODS</b>The original image data of 64-slice spiral CT was obtained from a patient with pancreatic tail carcinoma. Using adaptive region growing algorithm, the serial CT images were segmented and automatically extracted for 3-dimensional reconstruction of the pancreas and the anatomically related structures with a self-designed program. The model was then processed with Freeform Modeling System for image modification and smoothing. With the assistance of GHST SDK and PHANTOM software systems, preoperative simulation of surgical resection of the carcinoma was performed on the basis of the established pancreatic model.</p><p><b>RESULTS</b>The reconstructed 3-dimensional pancreatic model with the related structures clearly visualized the 3-dimensional structures of the pancreas, the pancreatic tail compromised by the carcinoma, and the adjacent organs, displaying also the distribution, courses and the anatomical relations of the ductal systems including the main pancreatic duct, abdominal aorta, portal vein system, and the biliary tract. During simulated surgery for pancreatic tail carcinoma resection, the GHOST SDK system allowed effective application of the virtual surgical instruments, and the use of PHANTOM software produced a surgical experience with high resemblance of that from an actual operation.</p><p><b>CONCLUSION</b>The serial CT data-based reconstruction of 3-dimensional pancreas model and simulated operation on this model using virtual-reality technique has great potentials for application in individualized surgical planning and surgical risk assessment in cases of pancreatic tail carcinoma, and also facilitates clinical training of the surgeons.</p>

Study on three dimensional reconstruction and simulation surgery of spleen / 中华外科杂志

<p><b>OBJECTIVE</b>To study the three-dimensional (3D) reconstruction and the visualization simulation surgery of spleen based on the scanning data of 64-slice helical computed tomograph (CT).</p><p><b>METHODS</b>The original data of 64-slice helical CT of spleen was collected, and then the CT image sequences were segmented and automatically extracted using auto-adapted region growth algorithm, and were conducted with the segmented images by adopt self-developed image processing software for 3D reconstruction. Finally, the 3D models were imported into FreeForm Modeling System for modifying and smooth. And the visualization simulation surgery was performed before splenectomy.</p><p><b>RESULTS</b>It was fast and effective to utilize auto-adapted region growth algorithm to conduct spleen image program segmentation; the reconstructed models were seen clearly and could reappear the structure of the spleen and the important surrounding organs. The effect of the splenectomy simulation surgery was similar to the practical surgery.</p><p><b>CONCLUSIONS</b>The research on 3D models of spleen and visualization simulation surgery of splenectomy could lead to clinical benefits. It maybe improve the surgical effect and decrease the surgical risk and reduce the complication demonstrating visualized operation before surgery.</p>

Virtual surgery of cholecystotomy for calculus removal and cholecystectomy in patients with cholecystolithiasis / 南方医科大学学报

<p><b>OBJECTIVE</b>To study the two-dimensional (2D) image segmentation, three-dimensional (3D) reconstruction and virtual surgery of cholecystectomy based on the 2D image data of the liver, biliary track and cholecystolithiasis obtained by 64-slice spiral CT.</p><p><b>METHODS</b>The image data of the liver, biliary track and cholecystolithiasis were obtained by 64-slice spiral CT scanning. Segmentation and automatic extraction of the images were performed using auto-adapting region growing algorithm. 3D reconstruction of the segmented data was carried out using MIMICS10.0 and self-designed software, and the data of the 3D model of the liver with the billiary tract were imported into FreeForm Modeling System for registration and smoothing. Virtual surgery of cholecystotomy for calculus removal and cholecystectomy were performed with Phantom.</p><p><b>RESULTS</b>The auto-adapting region growing algorithm allowed rapid image segmentation, and the 3D model of the liver based on the segmentation data clearly displayed vivid 3D structures of the liver. Virtual operations of cholecystectomy could be performed in the FreeForm Modeling System.</p><p><b>CONCLUSION</b>The algorithm we proposed can correctly and rapidly complete image segmentation and 3D reconstruction of cholecystolithiasis from the data 64-slice spiral CT, and allows virtual operations on the gallbladder.</p>

Clinical value of three-dimensional reconstruction of the biliary calculi based on 64-slice spiral CT scanning data / 南方医科大学学报

<p><b>OBJECTIVE</b>To study the clinical value of 3-dimensional (3D) reconstruction of the liver and its ductal structures using 64-slice spiral CT data in hepatobiliary surgery.</p><p><b>METHODS</b>The image data of 64-slice spiral CT scanning was obtained from patients with biliary calculi. Image segmentation was performed both using computer programs and manually, and 3D reconstruction of the liver was carried out using Mimics software. The reconstructed model of the liver and the ductal system was exported in STL format, and then into the FreeForm Modeling System for modification and smoothing, followed by image registration of the liver with the ductal system and the calculi.</p><p><b>RESULTS</b>The reconstructed liver model accurately represented the actual size of the liver and its anatomic landmarks, and by adjusting the transparency of the liver, the hepatic and intrahepatic arteries, veins, the portal vein, some abdominal vessels and the biliary system with the calculi were clearly visualized. The calculi in the intrahepatic and extrahepatic bile ducts were distinct in terms of the location and number, and dilation and stenosis of the intrahepatic and extrahepatic bile ducts were also clearly observed. The model presented with realistic profile of the liver that allowed vivid 3D observation. The model also allowed zooming and rotation for observation in full views.</p><p><b>CONCLUSIONS</b>The reconstructed model of the liver and its ductal system can be useful for preoperative planning and intraoperative complete removal of the calculi from the bile duct, and for the bile duct dilation and stenosis detected in the model, appropriate measures should be taken to reduce the residual calculi and prevent reoccurrence.</p>