<abstract xmlns="http://www.w3.org/1999/xhtml">

<sec>
<h3>Introduction</h3>
<p>Plastic scintillation detectors (PSD) have been developed for over four decades and are widely used in a variety of fields, but one can find relatively few reports of their clinical use compared to other dosimetric solutions.</p>
</sec>
<sec>
<h3>Material and methods</h3>
<p>The inexpensive detector setup made of a Saint-Gobain BC-400 plastic scintillator and commercially available on the market CMOS-based DSLR Pentax camera was investigated. Build PSD detectors were irradiated with 6, 10 and 15 MV flattening filtered (FF) and 6 and 10 MV flattening filter free (FFF) photon beams using a clinical linear accelerator. Data were processed using Matlab software to remove background and artefacts. A comparison of the spatial resolution parameters to the Gafchromic EBT3 films was performed.</p>
</sec>
<sec>
<h3>Results</h3>
<p>Average dose difference between TPS and PSD was 1.1%. The measured spatial resolution was 0.29 mm, and it differed from the film by 1.1%. MTF50 for PSD was 0.57 mm higher than the Gafchromic film. Signal to dose fit function with an R-square equal to 0.999 was established. The standard deviation of mean pixels value for a series of measurements was below 0.1%, for variable dose rate dependence was below 0.6% and for different energies 1.1%.</p>
<p>It was demonstrated that such a setup allows a satisfactory signal-to-dose dependence and provides high spatial resolution at an affordable price compared to a 2D ion chamber or a diode detector array. Moreover, PSDs are reusable and provide a simple readout compared to Gafchromic films commonly used in radiotherapy departments.</p>
</sec>
<sec>
<h3>Conclusions</h3>
<p>Variable parameters of the camera allow to select signal values at the optimal level. The system presented excellent signal stability, high image resolution and a simple signal-to-dose relationship which encourages further work to investigate PSDs for use in radiation therapy departments.</p>
</sec>
</abstract>

Introduction
Plastic scintillation detectors (PSD) have been developed for over four decades and are widely used in a variety of fields, but one can find relatively few reports of their clinical use compared to other dosimetric solutions.


Material and methods
The inexpensive detector setup made of a Saint-Gobain BC-400 plastic scintillator and commercially available on the market CMOS-based DSLR Pentax camera was investigated. Build PSD detectors were irradiated with 6, 10 and 15 MV flattening filtered (FF) and 6 and 10 MV flattening filter free (FFF) photon beams using a clinical linear accelerator. Data were processed using Matlab software to remove background and artefacts. A comparison of the spatial resolution parameters to the Gafchromic EBT3 films was performed.


Results
Average dose difference between TPS and PSD was 1.1%. The measured spatial resolution was 0.29 mm, and it differed from the film by 1.1%. MTF50 for PSD was 0.57 mm higher than the Gafchromic film. Signal to dose fit function with an R-square equal to 0.999 was established. The standard deviation of mean pixels value for a series of measurements was below 0.1%, for variable dose rate dependence was below 0.6% and for different energies 1.1%.
It was demonstrated that such a setup allows a satisfactory signal-to-dose dependence and provides high spatial resolution at an affordable price compared to a 2D ion chamber or a diode detector array. Moreover, PSDs are reusable and provide a simple readout compared to Gafchromic films commonly used in radiotherapy departments.


Conclusions
Variable parameters of the camera allow to select signal values at the optimal level. The system presented excellent signal stability, high image resolution and a simple signal-to-dose relationship which encourages further work to investigate PSDs for use in radiation therapy departments.

High resolution 2D plastic scintillator detectors for radiotherapy departments

Polish Journal of Medical Physics and Engineering

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

{"article-title":"High resolution 2D plastic scintillator detectors for radiotherapy departments"}

Introduction
Plastic scintillation detectors (PSD) have been developed for over four decades and are widely used in a variety of fields, but one can find...

High resolution 2D plastic scintillator detectors for radiotherapy departments

Article Category: Scientific Paper

Published Online: Jun 05, 2023

Page range: 92 - 103

Received: Aug 08, 2022

Accepted: May 01, 2023

DOI: https://doi.org/10.2478/pjmpe-2023-0011

Keywords
PSD, dosimetry, radiotherapy, plastic scintillation detectors, Gafchromic films

© 2023 Grzegorz Zbigniew Woźniak et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

High resolution 2D plastic scintillator detectors for radiotherapy departments

Article Category: Scientific Paper

Published Online: Jun 05, 2023

Page range: 92 - 103

Received: Aug 08, 2022

Accepted: May 01, 2023

DOI: https://doi.org/10.2478/pjmpe-2023-0011

KeywordsPSD, dosimetry, radiotherapy, plastic scintillation detectors, Gafchromic films

© 2023 Grzegorz Zbigniew Woźniak et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Keywords
PSD, dosimetry, radiotherapy, plastic scintillation detectors, Gafchromic films