最新刊期
卷 1 ， 期 4 ， 1996
- 摘要：Seven parameters concerning cellular nuclear sections, including area, perimeter, maximum feret diameter, minimum feret diameter, the equivalent-area circle diameter, circularity factor and shape factor,in adenomatoid hyperplasia of the liver (AHL), normal liver cells (NLC) and hepatocellular carcinoma (HCC), were first measured and analyzed quantitatively using the digital image analysis technology. The results showed: the average values of all the above seven parameters in AHL and HCC were very significantly different from those in NLC (p<0.01), the average values of four parameters (area,perimeter, the equivalent-area circle diameter, circularity factor) in AHL were significantly different from those is HCC(p关键词：Adenomatiod hyperplasia of liver,Digital image analysis,Morphometric atypism,2057|270|0更新时间：2024-05-08
- 摘要：Medicine is an improtant and broad application area of Imaging and Graphics. Medical research and clinical practice are both utilizing and in some sense depending on the technology and equipments of imaging and graphics. This paper gave a brief survey of medical imaging area introduced the developing course of the technology, discussed the topics to which the special attention had been paid. It also discussed the trend of medical imaging, specially the trend of its clinical application.2452|209|0更新时间：2024-05-08
- 摘要：How to fast and accurately reconstruct complex surfaces of organs has become increasingly important while the interslice distance is much larger than the interpixel distance. First, this paper presents a shape-keeping and adaptive feature points sampling algorithm, which can reduce storage and computational requirments in the post-processing procedure. Second, an algorithm for reconstructing surfaces from CT cross-sections based on shape feature point matching is presented, which takes into account four properties of tomographic images, i. e. intensity,gradient magnitude, gradient direction, and position disparity of the feature points to improve the accduracy of the reconstructed surface. The experimental results show the effectiveness of the above algorithms.2046|187|0更新时间：2024-05-08
- 摘要：Surface interpolation of cross-sectional images is one of the techniques of crucial importance in 3-D reconstruction. Gray scale value,gradiant of gray scale value,distance, oriantation are commonly used constraints in literatures. Using these methods, the 3-D reconstructed sufaces are often not smoothing. In this paper, the concept of directional distance and the constraint of smoothing surface are introduced. The method of smooth constrained 3-D surface interpotation of cross-sectional images and its experimental results are presented.2416|213|0更新时间：2024-05-08
- 摘要：he artificial prosthesis is widely used today as a measurer of curing hip prosthesis diseases. Its long-lasting functionability is affected heavily by the fitness between the femoral stems and the patient's marrow. However,the off-shelf femoral stems are available only in limited number of models. It usually does not fit individual patient well. There fore, the use of patient-fit artificial prosthesis is recommended. In this article a computer aided system for designing patient-fit intramedullary femoral stems is developed based upon the volume visualization technique. After the 3-D image of the femur is generated,the design of the femoral stem is carried out interactively. The system also simulates the cutted bone and the assembly of the femoral joint with the bone. It gives the doctor a good perspective of the operation before it is really done.Another advantage of the system is that less number of CT-images are needed in 3-D image reconstruction. The CT images are usually taken at relatively large interval,say about 2.0mm. Reducing this distance further is harmful to the health of patients. However,such distance is too large for reconstructing the 3-D image, since the dimension of the voxels must be compatible with it. It leads to a low-resolution image. Therefore,in this system a new interpolating algorithm is developed. The distribution of gray density in the new layers inserted into two given CT layers can be calculated directly from the distribution of gray density on the two known CT layers. With this new interpolating algorithm, the system is suitable for clinic purpose.2161|210|0更新时间：2024-05-08
- 摘要：By using NAI-200 medical image processing system, the liver volume and the spleen volume were succdessfully measured in vivo and the three-dimensional image of the two organs were rebuilt in 81 cases of posthepatitic cirrhosis, 17 of schistosomial cirrhosis and 32 of noncirrhotics.2513|211|0更新时间：2024-05-08
- 摘要：Seven parameters concerning cellular nuclear sections, including area, perimeter, maximum feret diameter, minimum feret diameter, the equivalent-area circle diameter, circularity factor and shape factor,in adenomatoid hyperplasia of the liver (AHL), normal liver cells (NLC) and hepatocellular carcinoma (HCC), were first measured and analyzed quantitatively using the digital image analysis technology. The results showed: the average values of all the above seven parameters in AHL and HCC were very significantly different from those in NLC (p<0.01), the average values of four parameters (area,perimeter, the equivalent-area circle diameter, circularity factor) in AHL were significantly different from those is HCC(p关键词：Adenomatiod hyperplasia of liver;Digital image analysis;Morphometric atypism1894|206|0更新时间：2024-05-08
- 摘要：in the present paper, a quasi-stationary-state electric field model is used to establish a group of finite-element analysis functions for the radio-frequency capacitive hyperthermic system. The 2DSAR and temperature distribution patterns in the muscle tissue are calculated by using a variety of electrode diameters of two electrodes and under different phase and power relations of three electrodes. Different simulated results are obtained. The simulated results show that,the main heating field of two electrodes RF capacitive hyperthermic system is always near the smaller electrode, and the effective heating region of three electrodes RF capacitive hyperthermic system is controlable by adjusting the phase and power of three electrodes. These results are helpful for the clinical applications.1957|198|0更新时间：2024-05-08
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- 摘要：Every year many heart patients use man-made valves which can be seriously imperiled by thrombi. The folw of the bloodstream passing through a man-made valve is one of the most important causes that bring about thrombi. The bloodstream is simulated with the help of a 10: 1 model and observed through a fluid visualization method. The dynamic process is videotaped by a videocamera. Then man can get the velocity and displacement of each small area by means of digital image processing and matching.The fluid arrow picture, that accurately describes the bloodstream in every twinkling, is obtained thereby.The quantitative description of the bloodstream is realized. With this method man can analyse the causes of thrombi, that the structure of a man-made valve leads to, and find valuable phenomena from it.2140|230|0更新时间：2024-05-08
- 摘要：This paper has built up the mathematical model for velocity measurement of nail fold microcirculation.,It pointed out that three factors should be taken into acdcount, i. e., the flow direction absoluted displacement and wobbling. After presenting the temparal registration method of nailfold microcirculation image series, a fast and accurate registration of nailfold capillaries to compensate the wobbling and deformation is realized. Through motion analysis and based on registration we achieve velocity measurement without principle errors for the first time. The actual measurements verified the effectiveness of our method.2302|222|0更新时间：2024-05-08
- 摘要：This paper discusses the importance of constructing practical medical image networks in our country and the technical difficulties to be encountered. The applications of PACS to diagnosis, therapy,management, education,and scientific research are studied. The possibility and feasibility of adopting computers and related techniques to solve these difficulties are also explored.2183|210|0更新时间：2024-05-08
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- 摘要：In this paper,algorithms for reconstruction of two kinds of partial k-space data in MRI is presented and realized. The result of our test is then given and discussed.2710|326|0更新时间：2024-05-08
- 摘要：Magnetic Resonance angiography (MRA) is introduced, which is a kind of technology of MRI applied in blood flow. MRA shows only the blood flow and suppresses the static tissue. Various aspects about this technology such as potential clinical application, background, methods and pluse sequences are presented. The techniques of MRA have been sorted into two classes. The first class is the time-of-flight methods which use the effets on NMR signal caused by blood flowing in or out of the imaging plane. The second class is the phase contrast methods which rely on motioninduced phase shifts in transverse spin magnetization. On the low-field MRI system (0.15T) made by ourself, a special pulse sequece has been designed and the arterial, veinal and arterial-veinal angiography can be obtained separatly,and the results are satisfatory. The present difficulties in MRA are also presented and discussed.关键词：Angiography technology;Blood vessels;Blood flow imaging;Magnetic resonance angiography;Magnetic resonance imaging (MRI)2181|198|0更新时间：2024-05-08
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