A scan field distortion correction function fore-beam exposure system is deduced on the basis of the plane field alternation principle, and a simulative fruit is given by computer.
根据平面区域变换的原理，导出电子束曝光机扫描场的畸变校正函数，并给出计算机模拟校正的结果。
Conclusion: When evaluating the lateral ankle ligaments with MRI, choice of appropriate scan plane will obtain the best images.
结论：MRI评价踝关节外侧韧带时，选择适当的扫描方位可以达到最佳的显示效果。
Methods:Dynamic CT scan was performed in 9 volunteers, measuring the CT value of the same plane of aortic arch and the theoretical threshold was obtained by the time density curve(TDC).
方法：9例志愿者行主动脉弓同层动态增强扫描，利用获得的主动脉弓时间-密度曲线（TDC），寻求触发技术的理论阈值。
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