Commissioning of enhanced dynamic wedge on a ROCS RTP system. 1997

C Liu, and B Waugh, and Z Li, and T C Zhu, and J R Palta
Department of Radiation Oncology, University of Florida College of Medicine, Gainesville, USA. liucr@bolus.health.ufl.edu

The enhanced dynamic wedge (EDW) is clinically commissioned on a ROCS RTPS (Version 5.03) in a manner similar to that used for any standard physical wedge. The required data set for implementation includes central axis depth dose, and open and wedge beam profiles at several depths and output factors. The features distinguishing the EDW from the physical wedge are a sharp change in output with field size in the wedge plane and a primary intensity difference at the end of the wedge field because the moving jaw stops 0.5 cm short of the fixed jaw position for all field sizes, for safety reasons. The monitor unit (MU) calculation for an EDW field in ROCS is based on scaling factors that are derived from a normalized golden STT (NGSTT). This approach requires no change in the data file structure of ROCS. It was found that the output for EDW is very sensitive to the value of final moving jaw position. Every 0.5 cm difference between planned and set value can cause 3.5% error.

UI MeSH Term Description Entries
D011880 Radiotherapy Planning, Computer-Assisted Computer-assisted mathematical calculations of beam angles, intensities of radiation, and duration of irradiation in radiotherapy. Computer-Assisted Radiotherapy Planning,Dosimetry Calculations, Computer-Assisted,Planning, Computer-Assisted Radiotherapy,Calculation, Computer-Assisted Dosimetry,Calculations, Computer-Assisted Dosimetry,Computer Assisted Radiotherapy Planning,Computer-Assisted Dosimetry Calculation,Computer-Assisted Dosimetry Calculations,Dosimetry Calculation, Computer-Assisted,Dosimetry Calculations, Computer Assisted,Planning, Computer Assisted Radiotherapy,Radiotherapy Planning, Computer Assisted

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