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Research and Implementation of Cardiac and a Region of Interest of Four-dimensional Visualization System

Author: RenGuoYin
Tutor: LvXiaoZuo
School: Inner Mongolia University of Science and Technology
Course: Applied Computer Technology
Keywords: 4D visualization Region of interest Volume of interest linear octree Myocardium and cardiovascular system
CLC: TP391.41
Type: Master's thesis
Year: 2013
Downloads: 3
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Abstract


As imaging diagnostic techniques develops, Four-dimensional non-invasive method fordiagnosis and treatment can show the movement of the patient’s heart and coronary explicitlyby making a Four-dimensional dynamic simulation on the course of heart and partial vesselsrun. The visualization for Local region of interest make local Cardiac vascular stenosis visible,revealing the local coronary law of motion and the three-dimensional structure and checkdynamically whether Local coronary arteries is stenosis caused by atherosclerosis or not,moreover, it can locate hardening of the blood vessels’ position as well as exclude otherillnesses which is similar to coronary heart disease. This method provides the diagnosed basisespecially for preoperative diagnosis of occult coronary artery disease.Misdiagnoses are often brought about in the diagnosis of coronary heart disease for thesake of the limitations of traditional treatment methods for coronary heart disease, the mainreason of which derives from the physician’s uncertainty of suspected symptom on suspectedcoronary heart disease. The tradition method possesses some limitations in the diagnosis ofcoronary heart disease so that Traditional ECG can just only reflect the process of cardiacelectrical excitability but not reflect the function of the heart beat as well as local coronaryatherosclerosis or myocardial ischemia.In order to overcome the shortcomings that cardiac motion morphology could not beobserved with real-time, all-round and multi-angle through two-dimensional medical imagesand three-dimensional reconstruction images, a new four-dimensional visualization solutionwas put forward which made an achievement of display myocardial and cardiovascular with4D. The continual cardiac image dataset can be got using the retrospectively ECG-gatedtechnique of the multi-slice spiral CT. Temporal resolution attached to the VR implemented4ddynamic display. The4D display of cardiac and4d-visualization of local cardiovascular systemare implemented. The results show that the4D-VR is fitter to restore myocardium movementform and get better4D visual experience. In algorithm, the VOI is dispersed into voxels usinglinear octree, and the flags of voxel sequence in and on the edge of VOI are used for searching voxel set. The experimental results show that the way of combing with octree reduces the timethat spends in calculating gradient, and saves the space that stores gradient.In addition, the continual cardiac image dataset and the multitemporal3D volume datasetwhich are from the retrospectively ECG-gated technique of the64-detector row computedtomography and volume rendering technique are used to get the MIP. At last, temporalresolution is attached to the VR and MIP to read and show multitemporal cardiac dataset.Localcardiovascular features can be highlighted by changing the opaqueness of interesting region of4D-VR and MIP, and images of cardiovascular system are shown dynamically. Cardiac4Dsimulation system can help doctor to make clinical decisions about CVD (cardiovasculardisease) quickly.

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CLC: > Industrial Technology > Automation technology,computer technology > Computing technology,computer technology > Computer applications > Information processing (information processing) > Pattern Recognition and devices > Image recognition device
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