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Atrial Fibrillation is the most common sustained cardiac arrhythmia. Minimally invasive ablation using surgical navigation technology gradually becomes the main-stream method in atrial fibrillation surgery. In this paper, a simplified 3D antenna-myocardium-blood numerical model is built and specific absorption rate (SAR) distribution is investigated at the frequency of 2450MHz using the FEM method...
In this paper, the system configuration and design scheme of a data acquisition system based on a time delay integration and charge-coupled device (TDI CCD) are introduced. The circuit design principle and implementation of TDI CCD driving pulses are presented, which are confirmed by Quartus II simulation with the Verilog Hardware Description Language (Verilog HDL). The output signals of TDI CCD are...
The heart tissue is rich in blood, which flow is a thermal diffusion process; it can lead to lesion shape differences. The temperature distribution is very hard to obtain through the antenna specific absorption rate, thus affect curative effect. Based on the Pennes bioheat transfer equation, high flow rate of blood effect on microwave ablation in atrial fibrillation was analyzed. Lesion depths and...
Based on the Pennes bioheat transfer equation, location and flow rate of a large blood vessel effect on microwave thermal ablation was analyzed, in which the convection heat transfer of the cooling water was involved. Numerical results showed when the distance between the antenna and a blood vessel exceeded 20mm; the ablation area was elliptical-like. The blood vessel effect on the ablation can be...
Currently, the cardiovascular diseases threaten almost two in one thousand new borns all around the world. The treatment of these diseases mainly depends on the surgeons' experiences. Surgeons have to choose one of the assumed options for a patient without comparing which is more feasible. In this paper, a cardiovascular surgical planning system was proposed to help the surgeons predict the optimal...
Tetralogy of Fallot (TOF) is one of the most common complex congenital heart diseases of newborns. In the presence of TOF, it is vital that creation of a shunt between the pulmonary and systemic circulations. The objective of this study is to use computational fluid dynamics (CFD) approaches to simulate flow variations in patients of TOF before and after the operation. Knowledge of the flow conditions...
Dental panoramic radiography, which plays an important part in the diagnosis of oral diseases especially the plastic, has been widely used in hospitals as a branch of radiography. The dental panoramic X-ray images show a two-dimensional view of whole teeth from left second molar to right second molar only, but they do not contain the 3D information of patients' oral and maxillofacial anatomical structure...
This paper brings forward a method which improves the work efficiency of the intersection by setting exclusive right-turn lanes combined with the pre-signal control. In conditions of a low flow of the right-turning vehicle but a high flow of the other direction vehicle, it changes right-turning vehicle lane into though-traffic lane combined with the pre-signal control at a certain time of every signal...
Medical image segmentation and 3D mesh generation are the two critical challenges for numerical analysis based on medical images. Seamlessly linking different segmented results to appropriate mesh generation algorithms should be greatly beneficial for automatic and rapid finite element modeling from medical images. We present the interface representation models between segmentation and mesh generation...
This paper analyzes systematically widespread problems about the most of bus stop boards existing in domestic ordinary, which include incomplete bus information in one area, lack of traffic information about the city and low humanity. In view of these problems,the paper proposes conceptual design of anew bus stop board on the basis of control ability and opening information. The conceptual design...
This paper presented numerical analysis for microwave ablation therapy with a water-cooled antenna operating at 60 W in the vitro. An axis symmetric finite element model was developed to simulate the temperature field, in which the influences of the water flow and heating time on the temperature distribution were investigated. Results show that the effect of water flow rate nearly made no difference...
The reality of a simulation environment always determines its future contribution to users, a system with force feedback device that adds haptic feedback to previous visual feedback In this paper, 3-D an interactive visualization system which can provide haptic feedback was designed to users and an example about the visualization of liver model was presented. First, an actual hepatic model from digital...
The techniques of converting 2D dental images directly to volume Finite Element (FE) model are discussed and an effective pipeline tool integrating these functions was developed. Based on this pipeline, the operations of image acquirement, segmentation, 3D geometric and FE model can smoothly and effectively carry out. The final result can be used to biomechanical simulation, clinical diagnosis and...
This paper gives a comparison of results obtained from numerical simulation and experimental measurements made in vitro pig liver with a water-cooled microwave ablation antenna. An axis-symmetric finite element model was developed to simulate the temperature field based on the pennes bioheat equation, in which the convection heat transfer of the cooling water was involved. The temperature curves and...
A novel approach with partly bridged stent was proposed in this paper for stenting treatment of aortic arch aneurysms to improve the blood perfusion to the side branches. The physiologic blood flows around the aortic arch aneurysms were simulated using a numerical method. Simulation results demonstrated that the flow activities inside the partly-stented aneurysm model were significantly diminished,...
Theoretical work has shown that blood flow plays an important role in determining temperature profiles of heated tissues. And in the complex blood network, the construction of branching vessels is the most important. In this paper, an experimental study on the effects of branching vessels on temperature distribution was performed. The experiment was implemented in a muscle-equivalent microwave phantom...
Hyperthermia is a type of cancer treatment in which body tissue is exposed to high temperatures. Research has shown that high temperatures can damage and kill cancer cells, usually with minimal injury to normal tissues. In the clinical application of hyperthermia, three methods can be distinguished: local, regional and whole-body hyperthermia. Hyperthermia is under study in clinical trials and is...
This computational study is motivated by the fact that there is still incomplete knowledge to date about hemodynamics of stented aortic arch aneurysms harboring a bleb. The hemodynamics in the stented and nonstented models of aortic aneurysms were analyzed and compared using the method of computational fluid dynamics. Flow activities inside the stented aneurysm model were significantly diminished,...
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