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以前,物理量的测量只限于收集空间某点随时间的变化的信息就可以了,可是随着各种测量技术和信息处理技术的发展,现在要测量和处理的是空间的许多点随时间连续变化的图象了。在医学里,图象测量开始较早,由心脏的力学运动产生的电场变化——心电图,把色素,放射性同位素(RI)注入到血液中时产生的指示剂稀释曲线等等。这些曲线的形状随时间变化,也就是要得到图象随时间的变化;根据 X 射线在生物体内吸收的差別得到 X 射线图象的二维图象。最近几年搜集显微图象或利用各种手段得到如断层象这样
In the past, the measurement of physical quantities was limited to the collection of information about a point in space over time, but with the development of various measurement techniques and information processing techniques, it is now time to measure and deal with the fact that many points of space change continuously over time The image of. In medicine, image measurement starts earlier, changes in the electric field caused by the mechanics of the heart - electrocardiograms, indicator dilution curves when injecting pigments, radioisotopes (RI) into the blood, and so on. The shape of these curves varies with time, that is, the change of the image with time. A two-dimensional image of the X-ray image is obtained based on the difference in X-ray absorption in the living body. In recent years, the collection of microscopic images or use of various means such as the fault like this