Can Three-Dimensional Reconstructed Image Replace Medical Photograph? / 대한이비인후과학회지

BACKGROUND AND OBJECTIVES: In recent years, medical recording by digital photography has become a useful tool in every field. Developments in digital techonology have enabled digital X-ray techniques as well as three-dimensional imaging tools such as CT and MRI. Digital data are processed to form three-dimensional images of the patient body and to provide virtual endoscopy. This study aims to widen the application of 3D images for medical recording. SUBJECTS AND METHOD: CT data from five patients with neck mass were used to make gross 3D images showing the lesion site with the aid of 3D-doctor 4.0 and RAPIDIA 3D ver. 2.8 (INFINITT healthcare , Seoul, Korea). Surface rendered images and volume rendered images were compared with the medical photos regarding identification, visibility of lesion, measuring, multidirectional view and reproducibility. RESULTS: 3D images could show real surface contour of the patients, including lesion sites. Shapes shown by the 3D images are exactly the same as the medical photographs, thus it was possible to measure the length and angles and view the image in any directions by rotating. CONCLUSION: Surface rendered and volume rendered images can be used as pre-operative recording tools.

Three-Dimensional Brain Surface Rendering Imaging of Cortical Dysplasia

PURPOSE: The study was to evaluate the localization of the abnormal gyral and sulcal patterns obtained by means of brain surface rendering imaging. MATERIALS AND METHODS: Nineteen patients with cortical dysplasia who underwent brain surface rendering MR imaging were included in this study. We acquired MP-RAGE sequence and created the 3-D surface rendering MR images by using VoxelPlus(R). Anatomical locations and configurations of abnormal gyri and sulci were reviewed. RESULTS: Abnormal gyral and sulcal patterns were seen 18 in 19 patients. The configuration and orientation of affected gyri and sulci were clearly evaluated in the brain surface rendering images. In a lissencephaly, the a cortex was not delineated and showed markedly thick and smooth gyral pattern. In a schizencephaly, there were wheel shaped broad gyral pattern around the cleft. In a hemimegalencephaly, an affected hemisphere were enlarged and displayed thick and wide gyral pattern. In CBPS, the insular cortex was exposed and the gyri of the lesion were thickened. In focal cortical dysplasia, there were irregular serrated or thick and enlarged gyri. CONCLUSION: Brain surface rendering MR imaging is useful for the evaluation of a detailed gyral pattern and accurate involvement site of abnormal gyri.

3D Reconstruction of High-resolution Volume Data Based on Surface Points / 航天医学与医学工程

Objective: To develop a way of high-quality real-time three dimension surface reconstruction for high-resolution volume data.Method 3D surface point sets of single organ were using a method of binding the threshold and morphological operations.The normal vector of every surface point was calculated.According to the gray gradients of volume data,the triangle face was replaced by surface points to describe the organ surface,and the surface was displayed with OpenGL interface of display card after defining the color and transparent of the organ surface.Result Based on hardware platform of personal computer,the reconstruction of skeleton and skin for the digitized virtual Chinese man No.1(VCH-M1) from CT database was constructed,the rendering speed was faster than 25 F/s.Conclusion The algorithm is capable of realizing a real-time rendering for 512?512?1720 high resolution volume data.

Three-Dimensional Images and Software for Studying Anatomical Structures in MRIs / 체질인류학회지

Medical students and doctors should study the appearance of normal anatomical structures in the magnetic resonance images (MRIs). For this purpose, horizontal, coronal, sagittal MRIs of a healthy entire body and corresponding segmented images were prepared. However, it is inconvenient to select interesting MRIs and segmented images; and it is difficult to understand how stereoscopic anatomical structures appear in the MRIs. Therefore, in this research, a software, on which interesting MRIs can be conveniently displayed among the horizontal, coronal, sagittal MRIs and corresponding segmented images can be displayed together, was composed. And after stacking the segmented images, three-dimensional (3D) image of each anatomical structure was manually reconstructed by surface rendering. Then another software, on which interesting 3D images of anatomical structures can be displayed and rotated, was composed too. These softwares are expected to help medical students and doctors understand normal anatomical structures in the MRIs and read pathological findings in the MRIs of patients.

Visualization for Three-dimensional Data / 医疗卫生装备

The two important methods for displaying three-dimensional data called surface rendering and volume rendering are introduced and analyzed.It is concluded that volume rendering is superior to surface rendering for the former one provides a basis for visualization of three-dimensional data.