A procedure to determine the radiation isocenter size in a linear accelerator
- 24 May 2004
- journal article
- research article
- Published by Wiley in Medical Physics
- Vol. 31 (6), 1489-1493
- https://doi.org/10.1118/1.1755491
Abstract
Measurement of radiation isocenter is a fundamental part of commissioning and quality assurance (QA) for a linear accelerator (linac). In this work we present an automated procedure for the analysis of the stars-shots employed in the radiation isocenter determination. Once the star-shot film has been developed and digitized, the resulting image is analyzed by scanning concentric circles centered around the intersection of the lasers that had been previously marked on the film. The center and the radius of the minimum circle intersecting the central rays are determined with an accuracy and precision better than 1% of the pixel size. The procedure is applied to the position and size determination of the radiation isocenter by means of the analysis of star-shots, placed in different planes with respect to the gantry, couch and collimator rotation axes.Keywords
This publication has 10 references indexed in Scilit:
- A personal-computer-based method to obtain “star-shots” of mechanical and optical isocenters for gantry rotation of linear acceleratorsMedical Physics, 2002
- A quality assurance device for the accuracy of the isocentres of teletherapy and simulation machinesPhysics in Medicine & Biology, 2000
- Setup verification in linac‐based radiosurgeryMedical Physics, 1999
- The measurement of linear accelerator isocenter motion using a three-micrometer device and an adjustable pointerInternational Journal of Radiation Oncology*Biology*Physics, 1996
- AAPM code of practice for radiotherapy accelerators: Report of AAPM Radiation Therapy Task Group No. 45Medical Physics, 1994
- Comprehensive QA for radiation oncology: Report of AAPM Radiation Therapy Committee Task Group 40Medical Physics, 1994
- Measurement of mechanical accuracy of isocenter in conventional linear-accelerator-based radiosurgeryInternational Journal of Radiation Oncology*Biology*Physics, 1993
- Mechanical and radiation isocenter coincidence: An experience in linear accelerator alignmentMedical Physics, 1992
- A simple isocenter checking procedure for radiotherapy treatment machines using the optical pointerMedical Physics, 1988
- Code of practice for x-ray therapy linear acceleratorsMedical Physics, 1975