Dosimetric Comparison of Ultra-Hypofractionated and Conventionally Fractionated Radiation Therapy Boosts for Patients with High-Risk Prostate Cancer

Life

Slav Yartsev¹  Julian Malicki²  Piotr Milecki²  Tomasz Piotrowski²  Agata Jodda³  Marta Adamczyk³  Jaroslaw Krawczyk⁴ 

[1] Department of Biophysics, University of Western Ontario, London, ON N6A 5C1, Canada;Department of Electroradiology, Poznan University of Medical Sciences, 61-866 Poznan, Poland;Department of Medical Physics, Greater Poland Cancer Centre, 61-866 Poznan, Poland;Radiotherapy Department I, Greater Poland Cancer Centre, 61-866 Poznan, Poland;

关键词: prostate;    ultra-hypofractionated radiation therapy;    dosimetric comparison;    dose metrics;    complexity;   

DOI  :  10.3390/life12030394

来源: DOAJ

【 摘 要 】

Recent comparison of an ultra-hypofractionated radiotherapy (UF-RT) boost to a conventionally fractionated (CF-RT) option showed similar toxicity and disease control outcomes. An analysis of the treatment plans for these patients is needed for evaluating calculated doses for different organs, treatment beam-on time, and requirements for human and financial resources. Eighty-six plans for UF-RT and 93 plans for CF-RT schemes were evaluated. The biologically equivalent dose, EQD2, summed for the first phase and the boost, was calculated for dose-volume parameters for organs at risk (OARs), as well as for the PTV1. ArcCHECK measurements for the boost plans were used for a comparison of planned and delivered doses. Monitor units and beam-on times were recorded by the Eclipse treatment planning system. Statistical analysis was performed with a significance level of 0.05. Dosimetric parameter values for OARs were well within tolerance for both groups. EQD2 for the PTV1 was on average 84 Gy for UF-RT patients and 76 Gy for CF-RT patients. Gamma passing rate for planned/delivered doses comparison was above 98% for both groups with 3 mm/3% distance to agreement/dose difference criteria. Total monitor units per fraction were 647 ± 94 and 2034 ± 570 for CF-RT and UF-RT, respectively. The total delivery time for boost radiation for the patients in the UF-RT arm was, on average, four times less than the total time for a conventional regimen with statistically equal clinical outcomes for the two arms in this study.

【 授权许可】

Unknown