ABSTRACT
Objective To compare the effect of thin-sliced enhanced CT scanning and 3D-DSA data sources in the 3 D printing data reconstruction of intracranial arteriovenous malformation (AVM ). Methods Five patients with AVM were selected prospectively,3 were Spetzler-Martin grade II and 2 were grade III. Two of them used 256-slice spiral CT thin slice enhanced scanning. Three used the 3D-DSA rotating imaging,and the DICOM raw data of the examination results were extracted. Digital processing was performed by using the Mimics software,and the 3 D printing was performed according to the ratio of 1∶1 obtaining the solid model and the effects were compared. Results Using the data source 3 D printing of 256 slice spiral CT thin-slice enhanced scan could obtained skull and blood vessel image information and could reveal the smallest diameter of 0. 9 mm vessel,however,the fine branch structures of the vessel were difficult to distinguish. The 3D printing based on 3D-DSA data,although the digital subtraction did not have the skull data information,the vascular branches showed more abundant. It could reveal the smallest diameter of 0. 9 mm vessel. Conclusions Using the CT thin-slice enhanced scan or 3D-DSA data source can obtain reconstruction images of AVM nidus,and 3D-DSA shows that the better effect for spatial structure of AVM nidus. It is helpful to the design of preoperative treatment scheme and the development of corresponding auxiliary tools.
ABSTRACT
<p><b>OBJECTIVE</b>To construct a three-dimensional (3D) liver model of Wuzhishan mini-pig for virtual liver surgeries.</p><p><b>METHODS</b>The biliary tree and hepatic arteries of Wuzhishan mini-pig were perfused with perchloroethylene and ethyl acetate along mixed with lead oxide, and the hepatic vein and portal vein were perfused with a mixture of dental base acrylic resin and lead oxide. The sectional images were acquired using a 64-slice spiral CT, and the 3D models of the portal vein, hepatic vein, biliary tree, hepatic arteries, and liver parenchyma were reconstructed using Mimics software; the resection image of the liver was also designed. The intrahepatic vascular cast was prepared by corroding the soft tissue with hydrochloric acid.</p><p><b>RESULTS AND CONCLUSION</b>The intrahepatic vascular cast obtained fully retained the vascular architecture and displayed the fifth- and sixth-level branches of the hepatic vein and portal vein and the third- and fourth-level branches of the artery and bile duct. The 3D model of liver allowed stereoscopic and accurate display of the third- and fourth-level branches of the hepatic vein and portal vein and the second- and third-level branches of the artery and bile duct. The 3D model showed fewer branches but represented the structural distribution identical to the cast. The 3D model could clearly display the spatial relationship between the vasculature and the soft tissue in virtual resection of the liver tissues, and thus provides a useful model for training of laparoscopic liver resection.</p>