The Empirical Formula of Effective Treatment Depth in Semifield of Isocenter Radiation for Postoperative Breast Cancer
(0) Purpose: Establish the empirical formula of effective treatment depth in semifield of isocenter radiation for postoperative breast cancer. Method: The postoperative breast cancer patients underwent virtual CT simulation, use 3D treatment planning system design plan of chest wall and inner mammary lymph node. Measure relevant parameter, establish model. Results: The empirical formula of chest wall target semifield isocenter tangential radiation is Y=0.7X-1.9 (X value range: 7.9cm-12.1cm). Correlation factor r=0.7738. The empirical formula of chest wall and lymph node target semifield isocenter tangential radiation is Y=0.5X-0.8 (X value range: 9.3cm-13.4cm). Correlation factor r=0.6384. Conclusion: Due to the irregular chest wall, oblique beam, semifield or quarterfield , tissue inhomogeneties (the beam traverse partial lung) all need to be corrected, it’s difficult to get exact MU use manual calculation. Empirical formula can be used calculate the effective treatment depth, and thus obtain more accurate MU.
breast cancer radiation oncology empirical formula
LIU Xiang-Yu XIE Yue
Radiation Oncology Department, Chongqing Cancer Hospital and Institute, PR China
国际会议
南京
英文
25-27
2009-10-23（万方平台首次上网日期，不代表论文的发表时间）