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의공학학적 기법을 사용한 간암 치료경과의 정량 : ( Emission CT Imaging )
우광방,주기환 연세대학교 대학원 1983 延世論叢 Vol.20 No.1
The computed topography techniques presently play the most important role in the field of medical electronics, and are indispensible in detecting and quantitizing the abnormality in human body without destroying it. The present study was aimed to investigate the compensation of attenuation effects in emission computed tomography using single photon emission source. The most difficult and fundamental problem in the development of algorithms for emission computed tomography is to eliminate the attenuation effects. The various mcthods for solving this problem has been developed, including talc iterative method which requires the large capacity computer and the complexed computation procedure. Taking into account this point, the present study has used the simple algorithms for the image reconstruction called the convolution method or filter-back-projection method. In addition, the two-step image compensation method has been employed for compensating attenuation effects. This method was so effective that it enables one to quantitize the emission uptake and to allow the localization of lesion. When accuracy is not essential, the secondary compensation procedure can be omitted for saving the computation time. The visual and quantitative analyses of the liver phantom section image utilizing the two-step image compensation method revealed considerable improvement of the compensated images.