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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
Image reconstruction algorithm for optically stimulated luminescence 2D dosimetry using laser-scanned Al2O3:C and
M F Ahmed1, E Schnell2, S Ahmad2
1Physics Department, Oklahoma State University, Stillwater, OK 74078, USA.
This study developed an image reconstruction algorithm for 2D dosimetry using optically stimulated luminescence (OSL) films. The algorithm corrects for system-specific artifacts, enabling accurate dose reconstruction even with sharp dose gradients.
Area of Science:
- Medical Physics
- Radiation Detection and Measurement
- Materials Science
Background:
- Optically stimulated luminescence (OSL) dosimetry offers a promising method for radiation dose assessment.
- Al2O3:C and Al2O3:C,Mg OSL films are sensitive detectors suitable for 2D dosimetry applications.
- Laser scanning readout systems provide high spatial resolution for OSL imaging.
Purpose of the Study:
- To develop and validate an image reconstruction algorithm for 2D dosimetry using laser-scanned Al2O3:C and Al2O3:C,Mg OSL films.
- To address and correct for artifacts inherent in the laser scanning OSL readout process.
- To demonstrate the algorithm's efficacy in reconstructing dose distributions, particularly in regions with steep dose gradients.
Main Methods:
- Development of a dose reconstruction algorithm incorporating corrections for galvo hysteresis, PMT linearity, phosphorescence, pixel bleeding, geometric distortion, and light collection efficiency.
- Irradiation of Al2O3:C film pieces to simulate dose distributions with extreme gradients.
- Scanning of OSLD film pieces using a custom-built laser-scanning OSL reader.
- Application of the algorithm to Al2O3:C and Al2O3:C,Mg films exposed to 6 MV x-rays and 12C beams.
Main Results:
- The image reconstruction algorithm successfully corrected for 'pixel bleeding' artifacts, even in the presence of sharp dose gradients.
- Corrections for geometric distortion and position-dependent light collection efficiency minimized system limitations.
- The algorithm demonstrated its capability to accurately reconstruct dose distributions from laser-scanned OSL films.
- Successful application to clinically relevant 6 MV x-ray and 12C pencil beams was shown.
Conclusions:
- The developed image reconstruction algorithm is effective for 2D dosimetry using laser-scanned Al2O3:C and Al2O3:C,Mg OSL films.
- The algorithm's ability to correct for various artifacts enhances the accuracy of dose reconstruction.
- This work lays the foundation for advanced laser-scanned OSL applications in 2D dosimetry, including small field dosimetry.
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