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자료유형
학술저널
저자정보
Park, Kawngwoo (Department of Radiation Oncology, Wonju Severance Christian Hospital, Yonsei University Wonju College of Medicine) Lee, Yongha (Department of Radiation Oncology, Wonju Severance Christian Hospital, Yonsei University Wonju College of Medicine) Cha, Jihye (Department of Radiation Oncology, Wonju Severance Christian Hospital, Yonsei University Wonju College of Medicine) You, Sei Hwan (Department of Radiation Oncology, Wonju Severance Christian Hospital, Yonsei University Wonju College of Medicine) Kim, Sunghyun (Department of Radiation Oncology, Wonju Severance Christian Hospital, Yonsei University Wonju College of Medicine) Lee, Jong Young (Department of Radiation Oncology, Wonju Severance Christian Hospital, Yonsei University Wonju College of Medicine)
저널정보
대한방사선종양학회 Radiation oncology journal : ROJ Radiation oncology journal : ROJ 제33권 제3호
발행연도
2015.1
수록면
242 - 249 (8page)

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Purpose: The purpose of this study is to compare the dosimetry of electron beam (EB) plans and three-dimensional helical tomotherapy (3DHT) plans for the patients with left-sided breast cancer, who underwent breast conserving surgery. Materials and Methods: We selected total of 15 patients based on the location of tumor, as following subsite: subareolar, upper outer, upper inner, lower lateral, and lower medial quadrants. The clinical target volume (CTV) was defined as the area of architectural distortion surrounded by surgical clip plus 1 cm margin. The conformity index (CI), homogeneity index (HI), quality of coverage (QC) and dose-volume parameters for the CTV, and organ at risk (OAR) were calculated. The following treatment techniques were assessed: single conformal EB plans; 3DHT plans with directional block of left anterior descending artery (LAD); and 3DHT plans with complete block of LAD. Results: 3DHT plans, regardless of type of LAD block, showed significantly better CI, HI, and QC for the CTVs, compared with the EB plans. However, 3DHT plans showed increase in the $V_{1Gy}$ at skin, left lung, and left breast. In terms of LAD, 3DHT plans with complete block of LAD showed extremely low dose, while dose increase in other OARs were observed, when compared with other plans. EB plans showed the worst conformity at upper outer quadrants of tumor bed site. Conclusion: 3DHT plans offer more favorable dose distributions to LAD, as well as improved target coverage in comparison with EB plans.

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