CTComputedTomography印计算机X线断层摄影装置，是近代飞速发展

的电子计算机控制技术和x线检查摄影技术相结台的产物。它能将人体分层

并用图像显现出来，在发现病变、确定病变的相对空叫位置、大小、数日方

面非常敏感而可靠，大大提高了病变的早期检出率和诊断准确率。拓展了现代

医学影像学的领域。-Correctionforreconstructed

images

wasthat the

ring

artifacts in theCartesian

coordinateweretransformedinto thevertical line artifactsinthe

polar

coordinateand

removedas

sinogram

correction．Thefirst methodis al(ind of

image preprocessing．

Anotherone

belongs

to

imagepostprocessing．In

mostcasescorrectionsare

optimally

applied

to sinogramdata．The setof

algorithms

enable

virtuallycompletering

artifact

removalfrom

tomographic imagery

withminimalto

negligible

contaminationofthe

underlying

data．