Abstract
A 4-field noncoplanar technique for treatment of prostate cancer developed at the University of Michigan was modified for use with low-energy (6 MV) beams. These modifications include the use of wedges on the 2 anterior inferior-superior oblique fields and adjusting the weights of the oblique and lateral fields appropriately. A margin of 1.5 cm around the physician-defined target region was used to define the blocks on each beam's-eye view. Dose distributions produced using this technique with 6-MV and 24-MV beams were compared visually on several dose planes (transverse and sagittal) and quantitatively by dose volume histograms (target, rectum, and bladder). These comparisons showed insignificant differences between the high-energy and low- energy treatment plans. Much larger differences were observed in comparisons of 2 types of coplanar plans with the noncoplanar setup for the 6-MV photon machine. Rectal doses measured in situ were used to help validate the dose distribution predicted by the treatment planning system for the 6-MV noncoplanar technique. (C) 2000 American Association of Medical Dosimetrists.
Original language | English (US) |
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Pages (from-to) | 37-40 |
Number of pages | 4 |
Journal | Medical Dosimetry |
Volume | 25 |
Issue number | 1 |
DOIs | |
State | Published - Mar 2000 |
Externally published | Yes |
Keywords
- Beam energy
- Conformal
- Prostate
- Radiotherapy
ASJC Scopus subject areas
- Radiological and Ultrasound Technology
- Oncology
- Radiology Nuclear Medicine and imaging