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电子计算机体层扫描(CT)这一新的X线检查方法,问世仅十年,就已取得迅速的发展。它的创造者英国工程师Hounsfield为此获得诺贝尔奖金。 CT是X线摄影和电子计算机的快速运算相结合的产物。它是利用一束很窄的X线束围绕人体某一很薄的横断面(约1.5—13mm)扫描,在人体的另一侧用高灵敏的探测器测出X线束通过这个横断面后衰减的数值。设想人体的横断面是由若干个小方格构成(称“象素”),由于它的组织构成不同,因而对X线的衰减也不同。使用X线束从不同的角度通过人体,也就是通过不同的小方格,对侧的探测器就可测
The computerized tomography (CT), a new X-ray examination method, has been developed rapidly for only a decade. Its creator, British engineer Hounsfield, won a Nobel Prize for this. CT is the product of a combination of X-ray photography and the fast computing of computers. It uses a very narrow X-ray beam to scan around a very thin cross-section of the human body (about 1.5-13 mm). On the other side of the human body, a highly sensitive detector detects the attenuation of the X-ray beam passing through this cross-section. Numerical value. It is assumed that the cross section of the human body is composed of a number of small squares (called “pixels”). Because of its different organization, the attenuation of X-rays is also different. Use the X-ray beam to pass through the human body from different angles, that is, through different small squares, the detector on the opposite side can be measured