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高에너지 電子線 治療를 爲한 線量分布 및 技術的 問題의 硏究
李道行,秋成實 대한방사선방어학회 1978 방사선방어학회지 Vol.3 No.1
High energy electron beams took effect for tumor radio-therapy, however, had a lot of problems in clinical application because of various conversion factors and complication of physical reactions. Therefore, we had experimentally studied the important properties of high energy electron beams from the linear accelerator, LMR-13, installed in Yonsei Cancer Center. The results of experimental studies on the problems in the 8, 10, 12 Mev electron beam therapy were reported as following. 1. On the measurements of the outputs and absorbed doses, the ionization type dosimeters that had calibrated by 90Sr standard source were suitable as under 3% errors for high energy electrons to measure, but measuring doses in small field sizes and the regions of rapid fall off dose with ionization chambers were difficult. 2. The electron energy were measured precisely with energy spectrometer consisted of magnet analyzer and tele-control detector and the practical electron energy was calculated under 5% errors by maximum range of high energy electron beam in the water. 3. The correcting factors of perturbated dose distributions owing to radiation field, energy and material of the treatment cone were checked and described systematically and variation of dose distributions due to inhomogeneous tissues and sloping skin surfaces were completely compensated. 4. The electron beams, using the scatterers; ie., gold, tin, copper, lead, aluminium foils, were adequately diffused and minimizing the bremsstrahlung X-ray induced by the electron energy, irradiation field size and material of scatterers, respectively. 5. Inproving of the dose distribution from the methods of pendulum, slit, grid and focusing irradiations, the therapeutic capacity with limited electron energy could be extended.
楊秉喆,李道行,崔炳肅 최신의학사 1976 最新醫學 Vol.19 No.3
From 1969, four hundred forty four carcinoma of the cervix patients were received radiotherapy and 378 patients were treated by Co-6O Teletherapy unit and 66 patients were by 10 MeV. Linear accelerator. The base line study of the staging were consists of pelvic examination. IVP cystoscopy and sigmoidoscopy. An analysis of 444 patients were as follow; 1. Age incidence-most common in 40-50 2. Squamous cell carcinoma accounted for 94.7% of the lesions and 5.3% was adenocarcinoma. 3. Incidence of staging were; stage I 13.8 II 49.1 III 21.5% IV 7.2% Other 5.6% 4. Most common complications are sigmoiditis (28.3%) and cystitis (29.3%) 5. High incidence complications were noted in parallel AP & PA, lateral opposing portsis compare with 4 oblique portals. 6. Post-operative (TAH) irradiation revealed high incidence of complication. Three year survival rate was 84.3% in stage II.
高 에너지 電子線 治療時 體內 空洞으로 因한 線量分布 變動
秋成實,李道行,崔炳뭐 대한방사선방어학회 1976 방사선방어학회지 Vol.1 No.1
The perturbation of dose distribution adjacent to cavities in high energy electron has shown that the percentage of dose increase varies markedly as a function of the build-up layer, the length and thickness of the cavities, and the electron energy. The dose distribution showed that cavities similar in size to those encountered in the head and neck measured by industrial film dosimetry and corrected by ionization chambers. The most increased doses by measuring are resulted in a localized dose of up to 130% of that measured at the depth of maximum dose within a homogeneous tissue equivalent phantom. The measured values and correction factors of dose perturbation due to air cavities showed in diagrams and would be summarized as follows. 1. In 8∼12MeV electron beams, the most marked dose is observed when the build-up layer thickness is 0.5cm and cavity volume is 2×2×2cm³. 2. The highest dose point is located under cavity when the energy is increased and cavity length is longer. 3. The cavity length at which the maximum percentage dose occurs decreases with increasing energy. 4. The highest percentage cavity doses are obtained when the energy is high, the build-up layer is thin, the thickness of the cavity is large, and the length of the cavity is approximately 1 to 3cm. 5. The doses of upper portion of cavity are less than the standard dose distribution as 5 to 10%. 6. The maximum range of electron beam are extended as much as thickness of cavity. 7. A cavity having a length of 5cm closely approximates a cavity of infinite length.