Background Comparing with two dimensional （2D） imaging, both in diagnosis and treatment, three dimensional （3D） imaging has many advantages in clinical medicine. 3D reconstruction makes the target easier to identi...Background Comparing with two dimensional （2D） imaging, both in diagnosis and treatment, three dimensional （3D） imaging has many advantages in clinical medicine. 3D reconstruction makes the target easier to identify and reveals the volume and shape of the organ much better than 2D imaging. A 3D digitized visible model of the liver was built to provide anatomical structure for planing of hepatic operation and for realizing accurate simulation of the liver on the computer. Methods Transverse sections of abdomen were chosen from the Chinese Visible Human dataset. And Amira software was selected to segment and reconstruct the structures of the liver. The liver was reconstructed in three-dimensions with both surface and volume rendering reconstruction. Results Accurately segmented images of the main structures of the liver were completed. The reconstructed structures can be displayed singly, in small groups or as a whole and can be continuously rotated in 3D space at different velocities. Conclusions The reconstructed liver is realistic, which demonstrates the natural shape and exact position of liver structures, tt provides an accurate model for the automated segmentation algorithmic study and a digitized anatomical mode of viewing the liver.展开更多
Background During scanning of the right hypochondrium and right intercostal regions with an ultrasonic transducer,several ultrasonic images of oblique sections are obtained.It is still a challenge for ultrasonography ...Background During scanning of the right hypochondrium and right intercostal regions with an ultrasonic transducer,several ultrasonic images of oblique sections are obtained.It is still a challenge for ultrasonography to divide these nonconventional sections into an accurate hepatic segmentation pattern.The aim of this research was to investigate the value of the virtual hepatic segment model （VHSM） in assisting the ultrasonic localization of space-occupying hepatic lesions.Methods VHSM was constructed via 3D reconstruction according to the first Chinese visible human dataset.Preoperative ultrasonography,contrast-enhanced CT scan and VHSM techniques were performed in 100 patients with spaceoccupying focal lesions in the liver parenchyma for segmental localization.The results of these three techniques were compared with the operative findings.Results VHSM was successfully detected on 2D sectional images by 3D reconstruction through surface rendering and volume rendering.The model could simulate ultrasonic directions to conduct a virtual dissection on any section plane,and fine liver segmentation could be displayed in any virtual plane.In 100 patients,there were 112 liver space-occupying focal lesions distributed in 148 liver segmentations.Regarding the positioning accuracies for lesions of different sizes and the lesion segmental distribution accuracies estimated using the three methods mentioned above,ultrasonography exhibited a significantly lower accuracy than VHSM for the segmental localization of lesions （P ＜0.05）,and contrast-enhanced CT was not significantly different from ultrasonography plus VHSM （P ＞0.05）.Conclusion VHSM increased the accuracy of ultrasonic localization of space-occupying hepatic lesions,particularly in hepatic hypovascular regions.展开更多
文摘Background Comparing with two dimensional （2D） imaging, both in diagnosis and treatment, three dimensional （3D） imaging has many advantages in clinical medicine. 3D reconstruction makes the target easier to identify and reveals the volume and shape of the organ much better than 2D imaging. A 3D digitized visible model of the liver was built to provide anatomical structure for planing of hepatic operation and for realizing accurate simulation of the liver on the computer. Methods Transverse sections of abdomen were chosen from the Chinese Visible Human dataset. And Amira software was selected to segment and reconstruct the structures of the liver. The liver was reconstructed in three-dimensions with both surface and volume rendering reconstruction. Results Accurately segmented images of the main structures of the liver were completed. The reconstructed structures can be displayed singly, in small groups or as a whole and can be continuously rotated in 3D space at different velocities. Conclusions The reconstructed liver is realistic, which demonstrates the natural shape and exact position of liver structures, tt provides an accurate model for the automated segmentation algorithmic study and a digitized anatomical mode of viewing the liver.
文摘Background During scanning of the right hypochondrium and right intercostal regions with an ultrasonic transducer,several ultrasonic images of oblique sections are obtained.It is still a challenge for ultrasonography to divide these nonconventional sections into an accurate hepatic segmentation pattern.The aim of this research was to investigate the value of the virtual hepatic segment model （VHSM） in assisting the ultrasonic localization of space-occupying hepatic lesions.Methods VHSM was constructed via 3D reconstruction according to the first Chinese visible human dataset.Preoperative ultrasonography,contrast-enhanced CT scan and VHSM techniques were performed in 100 patients with spaceoccupying focal lesions in the liver parenchyma for segmental localization.The results of these three techniques were compared with the operative findings.Results VHSM was successfully detected on 2D sectional images by 3D reconstruction through surface rendering and volume rendering.The model could simulate ultrasonic directions to conduct a virtual dissection on any section plane,and fine liver segmentation could be displayed in any virtual plane.In 100 patients,there were 112 liver space-occupying focal lesions distributed in 148 liver segmentations.Regarding the positioning accuracies for lesions of different sizes and the lesion segmental distribution accuracies estimated using the three methods mentioned above,ultrasonography exhibited a significantly lower accuracy than VHSM for the segmental localization of lesions （P ＜0.05）,and contrast-enhanced CT was not significantly different from ultrasonography plus VHSM （P ＞0.05）.Conclusion VHSM increased the accuracy of ultrasonic localization of space-occupying hepatic lesions,particularly in hepatic hypovascular regions.
