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6MeV 電子線으로 單一照射한 흰쥐 小腸 障害의 形態學的 變化
박종시,서을원 안동대학교 기초과학연구소 1999 基礎科學 硏究論文集 Vol.10 No.1
Thirty-five Spraque-Dawley rats, weighting 180-250gm, were divided into control and irradiation groups. The irradiation groups were divided into three group and 6 MeV electron was irradiated at the jejunum of small intestine. This three irradiation groups were sacrificed at 10 houres. 4 weeks and 8 weeks after following 8 Gray, 16 Gray different single does irradiation with 4 ×4 cm field of view. Authors attempted to study for acute and chronic radiation effect of small intestine with light microscopy and scanning electron microscopy. The histomorphological changes were as follows: Acute radiation effects were as follows: In gross observation, a few of rats developed a diarrhea in irradiation groups. The histomorphological changes were cells of apoptosis and necrosis, villi shortening. The mucosal surface was focally fragmented and submucosa revealed mild edema. Vessels were mild dilated and congested. Chronic radiation effects were as follows: The villi of small intestine were severely shortened, widened and microvilli was almost disappeared. Vessel walls were thickened, severly ectasia, focal rupture and hemorrhaged. Mucosal surface fragmentation, erosion, saccular and submucosal fibrosis were more severe than acute radiation effects. These acute and chronic radiation injury effect was more serious when radiation does increased. Conclusion: According to the above on light microscopy and scanning electron microscopy findings, authors suggest that we must tries to be effective radiation therapy and to be careful protector in acute and chronic radiation injuries of small intestinal mucosa.
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김경근,박종시 대구산업정보대학 2000 논문집 Vol.14 No.2
There are many gradient field artifact in using magnetic resonance imaging. But the static magnetic field artifact out of magnetic resonance are: 1) The main magnetic field from unqualeness of main magnetic resonance : The main magnetic field which is generated by imperfection of main magnetic resonance. 2) Ferromagnetic artifact : The field artifact by the phenomenon of distortion of signal which is reformed from equal magnetic field to unequal magnetic field. 3) Susceptibility Artifact : The field artifact which is generated by the partial transformation gradient magnetic artifact in the border line of two structure which have different susceptibility. The results of image out of gradient field artifacts are intention of signal, shortage of signal, distortion etc. Therefore we must removed magnetic material from the patient or must use non-magnetic material because it is mainly happened the distortion of image owing to metal material. In addition we must decrease gradient field artifact by using several practical assisting method about self-decreasing gradient field artifact.
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