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Characterization of Recombination Effects in a Liquid Ionization Chamber Used for the Dosimetry of a Radiosurgical Accelerator

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Dose rate correction for the novel 2D diode array MapCHECK 3.

Mengyang Li^1,2, Yuan Tian^1,2, Linyi Shen^1,2

¹Radiation Oncology Center, National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital, Chinese Academy of Medical Sciences, Beijing, China.

Journal of Applied Clinical Medical Physics

|August 5, 2024

Summary

The MapCHECK3 (SunPoint2 diodes) shows significant dose rate dependence, impacting measurement accuracy. Applying dose rate correction is recommended for precise results, especially when calibration and measurement conditions differ.

Keywords:

MapCHECK 2 MapCHECK 3 correction dose rate dependence dose verification

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Irradiator Commissioning and Dosimetry for Assessment of LQ α and β Parameters, Radiation Dosing Schema, and in vivo Dose Deposition

Published on: March 11, 2021

Area of Science:

Medical Physics
Radiation Oncology
Dosimetry

Background:

The MapCHECK system is crucial for quality assurance in radiation therapy.
Understanding dose rate dependence is essential for accurate treatment verification.

Purpose of the Study:

To evaluate the dose rate dependence of the MapCHECK3 system.
To assess the impact of dose rate variations on measurement accuracy.
To investigate the effectiveness of dose rate correction methods.

Main Methods:

Investigated average and instantaneous dose rate dependence for MapCHECK2 and MapCHECK3.
Compared MapCHECK measurements with ion chamber reference data.
Developed and applied exponential functions for dose rate correction on MapCHECK3.
Analyzed differences in measurements with and without dose rate correction.

Main Results:

MapCHECK3 exhibited a maximum dose rate dependence exceeding 2.5%.
Uncorrected measurements showed average differences up to 1.0% ± 0.8% in central diode dose.
Dose rate correction significantly improved accuracy, reducing differences to as low as 0.0% ± 0.9% and enhancing pass rates.

Conclusions:

MapCHECK3 (SunPoint2 diodes) has a more pronounced dose rate dependence than MapCHECK2 (SunPoint1 diodes).
Performing dose calibration under measurement conditions is advised for accuracy.
Implementing dose rate correction is crucial when calibration and measurement conditions vary.