胸部惡性腫瘍의 放射線治療計劃에 있어서 電算化斷層撮影의 利用에 관한 硏究

• 영문명: Radiotherapy Treatment Planning with computed Tomography in Malignant Tumors of the Chest-Comparison of various techniques
• 발행기관: 대한방사선종양학회
• 저자명: 李柱赫(Joo Hyuk Lee) 高京煥(Kyoung Hwan Koh) 河星煥(Sung Whan Ha) 韓萬靑(Man Chung Han)
• 간행물 정보: 『대한방사선종양학회지』제2권 제1호, 55~60쪽, 전체 6쪽
• 주제분류: 의약학 > 종양학
• 파일형태: PDF
• 발행일자: 1984.02.08

영문 초록

To evaulate the usefulness of computed tomography (CT) in radiotherapy treatment planning in malignant tumors of thoracic cage, the computer generated dose distributions were compared between plans based on conventional studies and those based on CT scan. 22 cases of thoracic malignancies, 15 lung cancers and 7 esophageal cancers, diagnosed and treated in Department of Therapeutic Radiology of Seoul National University Hospital from September, 1982 to April, 1983, were analyzed. In lung cancers, dose distribution in plans using AP, PA parallel opposing ports with posterior spinal cord block and in plans using box technique both based on conventional studies were compared with dose distribution using AP, PA and two oblique ports based on CT scan. In esophageal cancers, dose distribution in plans based on conventional studies and those based on CT scans, both using 3 port technique were compared. The results are as follows: 1. Parallel opposing field technique were inadequate in all cases of lung cancers, as portion of primary tumor in 13 of 15 cases and portion of mediastinum in all were out of high dose volume. 2. Box technique was inadequate in 5 of 15 lung cancers as portion of primary tumor was not covered and in every case the irradiated normal lung volume was quite large. 3. Plans based on CT scan were superior to those based on conventional studies as tumor was demarcated better with CT and so complete coverage of tumor and preservation of more normal lung volume could be made. 4. In 1 case of lung cancer, tumor localization was nearly impossible with conventional studies, but after CT scan tumor was more clearly defined and localized. 5. In 1 of 7 esophageal cancers, the radiation volume should be increased for marginal coverage after CT scan. 6. Depth dose correction for tissue inhomogeneity in possible with CT, and exact tumor dose can be calculated. As a result radiotherapy treatment planning based on CT scan has a great advantage over that based on conventional studies.