Research on Referential Safety Margins Modification of CTV to PTV Study in 87 Breast Cancer Cases of Three-dimensional Conformal Radiotherapy Target Volume Breast Cancer
CHEN Zuo-wen
LI Wen-wen
Abstract：Objective To study the reference data of referential safety margins of CTV to PTV in Three -dimensional Conformal Radio-therapy target volume with breast cancer.Methods The translational deviation of 87 breast cancer patients during Jan.and Dec.in 2013 were examined in the study.Vacuum cushion was used for chest and abdomen immobilization.The verification films were taken for each pa-tient prior the first treatment and the Nth were compared with the digitally reconstructed radiographs (DRR) by the HW-TPSQA system, in order to make translational deviation.CTV margin should be calculated with the formula 2.5Σ+0.7σby Van Herk al.Σmeans Systematic Error,σmeans Random Error.Results The margin of PTV of chest in three directions (x, y, z) was 2.36mm, 4.04 mm and 3.69 mm.Conclusion It has laid a theoretic foundation for the CTV margins by analyzing the translational deviation and made the design of radio -therapy system more scientific and normal in Three -dimensional Conformal Radiotherapy target volume with breast cancer.
Keywords：Breast CancerRadiotherapyThree-dimensional Conformal TechonologyTranslational deviation
Publication Date：2015-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：2( 39-40 )