BACKGROUND AND PURPOSE: In a published study on cervical cancer, 5-beam IMRT was inferior to single arc VMAT. Here we compare 9, 12, and 20 beam IMRT with single and dual arc VMAT. MATERIAL AND METHODS: For each of 10 patients, automated plan generation with the in-house Erasmus-iCycle optimizer was used to assist an expert planner in generating the five plans with the clinical TPS. RESULTS: For each patient, all plans were clinically acceptable with a high and similar PTV coverage. OAR sparing increased when going from 9 to 12 to 20 IMRT beams, and from single to dual arc VMAT. For all patients, 12 and 20 beam IMRT were superior to single and dual arc VMAT, with substantial variations in gain among the study patients. As expected, delivery of VMAT plans was significantly faster than delivery of IMRT plans. CONCLUSIONS: Often reported increased plan quality for VMAT compared to IMRT has not been observed for cervical cancer. Twenty and 12 beam IMRT plans had a higher quality than single and dual arc VMAT. For individual patients, the optimal delivery technique depends on a complex trade-off between plan quality and treatment time that may change with introduction of faster delivery systems.
RCT Entities:
BACKGROUND AND PURPOSE: In a published study on cervical cancer, 5-beam IMRT was inferior to single arc VMAT. Here we compare 9, 12, and 20 beam IMRT with single and dual arc VMAT. MATERIAL AND METHODS: For each of 10 patients, automated plan generation with the in-house Erasmus-iCycle optimizer was used to assist an expert planner in generating the five plans with the clinical TPS. RESULTS: For each patient, all plans were clinically acceptable with a high and similar PTV coverage. OAR sparing increased when going from 9 to 12 to 20 IMRT beams, and from single to dual arc VMAT. For all patients, 12 and 20 beam IMRT were superior to single and dual arc VMAT, with substantial variations in gain among the study patients. As expected, delivery of VMAT plans was significantly faster than delivery of IMRT plans. CONCLUSIONS: Often reported increased plan quality for VMAT compared to IMRT has not been observed for cervical cancer. Twenty and 12 beam IMRT plans had a higher quality than single and dual arc VMAT. For individual patients, the optimal delivery technique depends on a complex trade-off between plan quality and treatment time that may change with introduction of faster delivery systems.
Authors: Tokihiro Yamamoto; Sven Kabus; Matthieu Bal; Karl Bzdusek; Paul J Keall; Cari Wright; Stanley H Benedict; Megan E Daly Journal: Int J Radiat Oncol Biol Phys Date: 2018-05-04 Impact factor: 7.038
Authors: Abdul Wahab M Sharfo; Sebastiaan Breedveld; Peter W J Voet; Sabrina T Heijkoop; Jan-Willem M Mens; Mischa S Hoogeman; Ben J M Heijmen Journal: PLoS One Date: 2016-12-29 Impact factor: 3.240
Authors: Daniel Buergy; Abdul Wahab M Sharfo; Ben J M Heijmen; Peter W J Voet; Sebastiaan Breedveld; Frederik Wenz; Frank Lohr; Florian Stieler Journal: Radiat Oncol Date: 2017-01-31 Impact factor: 3.481