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Electron beam reference dosimetry measurements obtained at multiple institutions using the Addendum to AAPM's TG-51

Bryan R Muir¹, Thomas H Davis², Sandeep Dhanesar³

¹Metrology Research Centre, National Research Council of Canada, Ottawa, Ontario, Canada.

Medical Physics

|April 3, 2025

Summary

The updated TG-51 Addendum for electron beam dosimetry provides revised procedures and data, leading to dose differences of up to 2.3% compared to the original protocol. These findings help clinical physicists implement the Addendum with expected variations.

Keywords:

Addendum TG‐51 reference dosimetry

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Area of Science:

Medical Physics
Radiation Oncology
Dosimetry

Background:

The TG-51 protocol outlines reference dosimetry for external photon and electron beams.
Research has led to revisions of the original TG-51 protocol, culminating in an Addendum for electron beam dosimetry.
The Addendum introduces updated formalism, procedures, and kQ data.

Purpose of the Study:

To compare clinical reference dosimetry measurements in electron beams using the original TG-51 protocol and its Addendum.
To identify the sources of discrepancies between the two dosimetry protocols.

Main Methods:

Nine participants from clinics and a standards laboratory performed measurements.
Data were collected from 18 linear accelerators across 87 electron beam energies (4-22 MeV).
Various ionization chamber types (cylindrical and parallel-plate) were utilized.

Main Results:

The Addendum resulted in dose to water per monitor unit values up to 2.3% higher than the original TG-51.
Differences stem from procedural changes (e.g., Pgr correction, measurement shifts) and updated data (k'R50, kecal).
Discrepancies were consistent with Addendum predictions.

Conclusions:

This study clarifies the origins of differences between the TG-51 protocol and its Addendum for electron beam dosimetry.
The findings support the reliability of the Addendum's revised approach and data.
Results aid clinical physicists in managing expected variations during Addendum implementation.