基于64排螺旋CT扫描数据的肝脏图像分割和三维重建  

Image segmentation and three-dimensional reconstruction of the liver based on 64-slice spiral CT scanning data

作　　者：朱新勇[1] 方驰华[1] 鲍苏苏[2] 全显跃[3] 钟世镇[4] 

机构地区：[1]南方医科大学珠江医院肝胆外科,广东广州510282 [2]华南师范大学计算机学院,广东广州510631 [3]南方医科大学珠江医院影像中心,广东广州510282 [4]南方医科大学临床解剖研究所,广东广州510515

出　　处：《南方医科大学学报》2008年第3期345-347,352,共4页Journal of Southern Medical University

基　　金：国家高技术研究发展(863)计划(2006AA02Z346);国家自然科学基金(30470493);广东省自然科学基金团队项目(6200171)~~

摘　　要：目的研究肝脏CT扫描图像中肝脏和肝内血管管道的分割方法及3D肝脏应用于肝脏虚拟手术的可行性及实用性。方法利用正常人肝脏64排螺旋CT薄层扫描数据集,采集二维图像数据,利用图像处理软件Photoshop和MIMICS软件对二维图像数据进行肝脏及其肝内管道的图像分割和三维可视化重建,并对3D肝脏及其内部血管管道的效果进行评价。结果肝脏的64排螺旋CT薄层扫描数据集:共获得658层CT扫描图像。分割后的肝脏边界清晰,肝内管道数据无丢失。分割后图像连续观察肝脏连续性好,无中断现象。重建的肝脏轮廓能真实反映肝脏的实际体积,具有肝脏的解剖标志,重建的管道结构清晰,管道连续、自然。通过调节肝脏的透明度可同时显示肝脏和肝内的动脉、静脉和门静脉各分支。结论利用Photoshop图像处理软件对不同扫描时相的图像进行分割,方法简单实用,分割效果理想,重建时采用二次域值设置可分别将肝脏和肝脏内部管道系统重建,重建后的肝脏模型三维效果逼真,立体感强,既能够显示肝内各主要管道系统的空间位置关系,又能准确地反映肝脏轮廓体积,为虚拟手术奠定了准确逼真的3D肝脏模型。Objective To study the segmentation methods of the liver CT images and the value of 3-dimensional （3D） reconstruction of the liver in the planning of hepatic surgery. Methods The 2D Digital Imaging and Communications in Medicine （DICOM） format data of the liver obtained from healthy volunteers were transformed into bmp format image, and the liver image segmentation was performed using Photoshop software. The 3D model was reconstructed using MIMICS software. Results The DICOM format data of the liver obtained by 64 slice spiral CT included totally 658 slice images. The segmented liver image showed clear profiles and complete intrahepatic duct data were reserved. The segmented liver images were free of discontinuation during continuous observation. The liver surface and internal ductal system, including the hepatic arteries and veins, and the hepatic portal system and their branches, were represented clearly. The reconstructed liver allowed clear identification of the anatomic landmark and matched the actual liver volume. The reconstructed ductal structure were distinct and continuous with natural texture. The reconstructed liver and the hepatic internal duct system were simultaneously displayed by adjusting the transparency of the liver, and the blood vessels were also represented. Conclusion Segmentation of the liver images in different phases using Photoshop can be feasible for liver reconstruction. The reconstructed liver and the intrahepatic ductal structure allow vivid 3D observation of the spatial relationship among the major tracts and accurate estimation of the liver volume.

关 键 词：肝脏外科 管道结构 图像分割 三维重建 计算机辅助 

分 类 号：R816.5[医药卫生—放射医学]