Abstract

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Title:: Effects of minimum segment width on the execution efficiency and dose validation of IMRT plans for primary liver cancer

Author(s):: JI Hongbing; WANG Kai; WU Jiahui; LIU Wenhui; Department of Radiation Oncology, Mengchao Hepatobiliary Hospital of Fujian Medical University, Fuzhou 350028, China

Keywords:: Keywords: primary liver cancer minimum segment width execution efficiency dose verification gamma passing rate

Abstract:: Abstract: Objective To evaluate the dose distribution and execution accuracy of intensity-modulated radiation therapy (IMRT) plans with different minimum segment widths for patients with primary liver cancer, thereby providing reference for the radiotherapy planning. Methods A retrospective study was conducted on 30 patients with primary liver cancer. With the other optimization condition unchanged, 5 IMRT plans with minimum segment widths of 0.6, 0.8, 1.0, 1.2 and 1.5 cm were made for each patient, and the dose distribution, execution efficiency and gamma passing rate of the 5 plans were compared. Results The monitor units and delivery time of the 5 plans decreased with increasing minimum segment width, while the gamma passing rates at 3 mm/3% and 2 mm/2% tended to increase, with statistical differences (P<0.05). Conclusion The 5 plans in the study can be used for clinical treatment. While meeting the clinical requirements, reasonably setting the minimum segment width in IMRT plan can reduce monitor units, shorten delivery time, and improve treatment accuracy.