ABSTRACT
In this paper, we present a virtual endoscopy (VE) for diagnosis of heart diseases, which is proved efficient and affordable, easy to popularize for viewing the interior of the heart. The dual source CT (DSCT) data were used as primary data in our system. The 3D structure of virtual heart was reconstructed with 3D texture mapping technology based on graphics processing unit (GPU), and could be displayed dynamically in real time. When we displayed it in real time, we could not only observe the inside of the chambers of heart but also examine from the new angle of view by the 3D data which were already clipped according to doctor's desire. In the pattern of observation, we used both mutual interactive mode and auto mode. In the auto mode, we used Dijkstra Algorithm which treated the 3D Euler distance as weighting factor to find out the view path quickly, and, used view path to calculate the four chamber plane.
Subject(s)
Humans , Algorithms , Endoscopy , Methods , Heart , Diagnostic Imaging , Image Processing, Computer-Assisted , Imaging, Three-Dimensional , Tomography, Spiral Computed , Methods , User-Computer InterfaceABSTRACT
Objective To apply 3C3R model in problem design of PBL for pediatrics teaching.Methods The 3C3R model comprises two classes of components:core components and processing components.Core components of the model are 3C,which are content,context and connection while processing components are 3R,which are researching,reasoning and reflecting.3C3R model was used in the problem design for the PBL case of ‘ Why the mouth of Baobao became purple when he was crying?' Totally 76 eight-year program medical students and 7 tutors were enrolled as teaching object.The anonymous questionnaires from the students were collected for assessment of PBL teaching.Results The percentage of students with scores ≥4 for content in PLB problem design was 90.8％,for context was 80.3％,for connection was 64.5％,for researching was 81.6％,for reasoning was 69.7％ and for reflecting was 40.8％.The percentage of tutors with scores ≥4 for content in PLB problem design was 100％,for context was 71.4％,for connection was 28.6％,for researching was 71.4％,for reasoning was100％,for reflecting was57.1％.Both students and tutors held a positive attitude towards the component of content,context,researching and reasoning in problem design model.But the components of connection and reflection needed to be improved.Conclusion The 3C3R model is helpful for problem design of PBL in pediatric teaching.
ABSTRACT
Objective To research the visualization of congenital heart disease by three-dimensional echocardiographic(3DE) virtual endoscopy(VE) system. Methods Datasets.from 10 healthy children and 22 patients with congenital heart disease were collected (10 patients with atrial septal defects, 6 patients with ventricular septal defects and 6 patients with tetralogy of Fallot). 3DE heart models were reconstructed by virtual reality computing techniques and visualization in scientific computing techniques. The VE system was programmed under the C++ 6.0 language condition,the visualization toolkit (VTK) platform was employed to carry out the graphics and visualization utilities. The virtual eye can move along the navigation paths in the heart by manual camera movements. Results The VE can provide special information in aspects of intracardiac anatomy, The visible heart models show precisely complex anatomy structure and spatial relationships. 3DE intracardiac endoscopic imaging can thus be visualized and navigated successfully by the VE system. Conclusions 3DE VE is a new system for the visualization of congenital heart disease.