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Comparison of Dosimetry of a New Linear Accelerator under Gated Operation vs. Non-gated Operation by Chen, S.; Zhou, S.; Schubert, L.; Li, S.; Lin, C.; Wahl, A.; Enke, C. is a Medicine article available to read on EtoBox.

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Purpose/Objective(s): To compare single (sRA), double (dRA), and triple (tRA) -arc RapidArc (RA) plans with seven (7IMRT) and nine (9IMRT) field IMRT plans prepared for complex-shaped high-risk prostate cancers. Materials/Methods: The RA and IMRT plans were prepared in Eclipse v8.6 treatment planning system for 7 prostate cancer patients. The primary PTV included the prostate, seminal vesicles and lymph nodes with margins while OAR included the bladder, rectum and small bowel. The sRA was obtained with a 360 counter-clockwise gantry rotation between 179.9 and 180.1 . For the dRA, the gantry continued its next 360 rotation clockwise in the second arc-field. The tRA had three sequential 330 arcs because of the total arc limitation of 1000 . In order to compare the OAR sparing performance of the treatment plans more accurately, plans are optimized using the RTOG 0521 protocol. For instance, PTV volume covered by the prescribed dose was set to 95%. In addition, the optimization process was repeated by fine-tuning the dose volume constraints to limit the PTV volume receiving more than 107% of prescribed dose to 1.5%-3%. The PTV DVHs were, therefore, shaped such that the PTV coverage and

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Author

Chen, S.; Zhou, S.; Schubert, L.; Li, S.; Lin, C.; Wahl, A.; Enke, C.

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0360-3016)

Published

2010

Language

EN

Field

Medicine (Health Sciences)