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Report No. 155 - Report of AAPM Task Group 155: Megavoltage photon beam dosimetry in small fields and non-equilibrium conditions (2021)

Category: Reports

Small-field dosimetry used in advance treatment technologies poses challenges due to loss of lateral charged particle equilibrium (LCPE), occlusion of the primary photon source, and the limited choice of suitable radiation detectors. These challenges greatly influence dosimetric accuracy. High profile radiation incidents have demonstrated a poor understanding of appropriate methodology for small-field dosimetry. These incidents are a cause for concern because the use of small fields in various specialized radiation treatment techniques continues to grow rapidly.

Medical Physics
https://doi.org/10.1002/mp.15030

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Keywords: detector correction factors, non-equilibrium dosimetry, photon dose modeling, relative dosimetry, small field, treatment modalities
First published: 08 June 2021

Indra J. Das, Paolo Francescon, Jean M Moran, Anders Ahnesjo, Maria Mania Aspradakis, Chee-Wai Cheng, George X. Ding, John D. Fenwick, M. Saiful Huq, Mark Oldham, Chester S. Reft, Otto A. Sauer

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