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一、前言 计算机处理的X线断层摄影装置(以下简称X线CT装置)是计算处理人体横剖面上X线吸收系数的分布并显示出图像的装置。它与普通的X线摄影法相比对比度分辨率要好得多。自1895年发现X线以来研究过各种摄影方法和机器。其中具有划时代意义的是1972年制成的X线CT装置。特别是对于脑溢血以及脑肿疡,头部外伤等头盖骨内的病变必须通过X线CT像来检查。近年来由于提高了装置的性能,即缩短了扫描时间(几秒),提高了对比度分辨率(可以识别
I. Introduction Computerized tomography (hereinafter referred to as X-ray CT) is a device that calculates and processes the distribution of X-ray absorption coefficient in the cross-section of human body and displays the image. Contrast resolution is much better than normal radiography. Various photographic methods and machines have been studied since the X-ray was discovered in 1895. One landmark is the X-ray CT device made in 1972. Especially for cerebral hemorrhage and cerebral edema, head trauma and other intracranial lesions must be examined by X-ray CT images. In recent years, due to improved device performance, which shortens the scan time (a few seconds), increased contrast resolution (can identify