Monitor unit calculation for an intensity modulated photon field by a simple scatter-summation algorithm
- 9 February 2000
- journal article
- research article
- Published by IOP Publishing in Physics in Medicine & Biology
- Vol. 45 (3), N1-N7
- https://doi.org/10.1088/0031-9155/45/3/401
Abstract
An important issue in intensity modulated radiation therapy (IMRT) is the verification of the monitor unit (MU) calculation of the planning system using an independent procedure. Because of the intensity modulation and the dynamic nature of the delivery process, the problem becomes much more involved than that in conventional radiation therapy. In this work, a closed formula for MU calculation is derived. The approach is independent of the specific form of leaf sequence algorithms. It is straightforward to implement the procedure using a simple computer program. The approach is illustrated by a simplified example and is demonstrated by a few CORVUS (NOMOS Corporation, Sewickley, PA) treatment plans. The results indicate that it is robust and suitable for IMRT MU verification.Keywords
This publication has 5 references indexed in Scilit:
- Theoretical considerations of monitor unit calculations for intensity modulated beam treatment planningMedical Physics, 1999
- Dosimetric verification of a commercial inverse treatment planning systemPhysics in Medicine & Biology, 1999
- Use of a multileaf collimator as a dynamic missing‐tissue compensatorMedical Physics, 1996
- Comprehensive QA for radiation oncology: Report of AAPM Radiation Therapy Committee Task Group 40Medical Physics, 1994
- A protocol for the determination of absorbed dose from high‐energy photon and electron beamsMedical Physics, 1983