Implementation of the AAPM Task Group 21 protocol by the Radiological Physics Center and its implications

Journal Article · · Med. Phys.; (United States)

DOI:https://doi.org/10.1118/1.595525· OSTI ID:6127626

Gastorf, R J; Hanson, W F; Shalek, R J; Berkley, L W

The Radiation Therapy Committee of the American Association of Physicists in Medicine appointed Task Group 21 to write a new protocol for the calibration of high-energy photon and electron therapy beams. This protocol updates the physical parameters used in the calculations and is intended to account for differences in ionization chamber design and some differences between phantom materials that were not considered in previous protocols. This paper discusses how the Radiological Physics Center (RPC) intends to implement the new protocol, the changes required in the RPC calibration techniques, and the magnitude of the change in the RPC calculations of absorbed dose resulting from the implementation of the new protocol. Although the change in the RPC absorbed-dose calculations will be only 0%-2% over the range of photon and electron energies of interest, some institutions using specific dosimetry systems may find their absorbed-dose calculations changing by 4% or more.

• Research Organization: Univ. of Texas System Cancer Center, Houston
• OSTI ID: 6127626
• Journal Information: Med. Phys.; (United States), Journal Name: Med. Phys.; (United States) Vol. 11:4; ISSN MPHYA
• Country of Publication: United States
• Language: English

Related Subjects

550603 -- Medicine-- External Radiation in Therapy-- (1980-)
61 RADIATION PROTECTION AND DOSIMETRY
62 RADIOLOGY AND NUCLEAR MEDICINE
655003* -- Medical Physics-- Dosimetry
BEAMS
CALIBRATION
DOSES
DOSIMETRY
ELECTRON BEAMS
LEPTON BEAMS
MEDICINE
MOCKUP
NUCLEAR MEDICINE
PARTICLE BEAMS
PHANTOMS
PHOTON BEAMS
RADIATION DOSES
RADIOLOGY
RADIOTHERAPY
STRUCTURAL MODELS
THERAPY