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Accelerator beam data commissioning equipment and procedures: Report of the
TG-106 of the Therapy Physics Committee of the AAPM
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For commissioning a linear accelerator for clinical use, medical physicists are faced
with many challenges including the need for precision, a variety of testing methods, data
validation, the lack of standards, and time constraints. Since commissioning
beam data are
treated as a reference and ultimately used by treatment planning systems, it is vitally
important that the collected data are of the highest quality to avoid dosimetric and patient
treatment errors that may subsequently lead to a poor radiation outcome. Beam data commissioning should
be performed with appropriate knowledge and proper tools and should be independent of the
person collecting the data. To achieve this goal, Task Group 106 (TG-106) of the Therapy
Physics Committee of the American Association of Physicists in Medicine was formed to
review the practical aspects as well as the physics of linear accelerator commissioning.
The report provides guidelines and recommendations on the proper selection of phantoms and
setting up of a phantom for data acquisition (both scanning and no-scanning data),
procedures for acquiring specific photon and electron beam parameters and methods to reduce measurement errors
, beam data processing and detector size convolution for accurate profiles. The TG-106
also provides a brief discussion on the emerging trend in Monte Carlo simulation
techniques in photon and electron beam commissioning. The procedures described in this report
should assist a qualified medical physicist in either measuring a complete set of
beam data, or in
verifying a subset of data before initial use or for periodic quality assurance
measurements. By combining practical experience with theoretical discussion, this document
sets a new standard for beam data commissioning.
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