A dosimetric evaluation of the IAEA-AAPM TRS483 code of practice for dosimetry of small static fields used in conventional linac beams and comparison with IAEA TRS-398, AAPM TG51, and TG51 Addendum protocols

Medical Physics
M Saiful HuqRonald J Lalonde

Abstract

The International Atomic Energy Agency (IAEA) and the American Association of Physicists in Medicine (AAPM) have jointly published a new code of practice (CoP), TRS483, for the dosimetry of small static photon fields used in external beam radiotherapy. It gave recommendations on how to perform reference dosimetry in nonstandard machine-specific reference (msr) fields and measure field output factors in small fields. The purpose of this work was to perform a dosimetric evaluation of the recommendations given in this CoP. All measurements were done in a Varian TrueBeam™ STx linear accelerator. Five ionization chambers were used for beam quality measurements, four Farmer type ionization chambers for performing reference dosimetry and two diodes for performing field output factor measurements. Field output factor measurements were done for fourteen field sizes (ranging from 0.5 cm × 0.5 cm to 10 cm × 10 cm). Beam energies used were: 6 MV WFF, 6 MV FFF, 10 MV WFF, and 10 MV FFF. Where appropriate, results from this study were compared with those obtained from the recommendations given in the IAEA TRS398 CoP, AAPM TG51 and TG51 Addendum protocols. Beam quality measurements show that for all beam energies and for equivalent square msr...Continue Reading

Citations

Jan 14, 2021·Physics in Medicine and Biology·Hugo Bouchard
May 1, 2021·Biomedical Physics & Engineering Express·Shekhar DwivediJooli Shukla
Jun 20, 2021·Critical Reviews in Oncology/hematology·Diana M Ghemiş, Loredana G Marcu
Jul 10, 2021·Physica Medica : PM : an International Journal Devoted to the Applications of Physics to Medicine and Biology : Official Journal of the Italian Association of Biomedical Physics (AIFB)·ByongYong Yi, Stewart J Becker
Aug 9, 2021·Physica Medica : PM : an International Journal Devoted to the Applications of Physics to Medicine and Biology : Official Journal of the Italian Association of Biomedical Physics (AIFB)·José M Lárraga-GutiérrezOlga O Galván de la Cruz

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