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Universal Hand-held Three-dimensional Optoacoustic Imaging Probe for Deep Tissue Human Angiography and Functional Preclinical Studies in Real Time

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Technical note: a fast laser-based optical-CT scanner for three-dimensional radiation dosimetry.

A E Papadakis¹, T G Maris, G Zacharakis

¹Department of Medical Physics, University Hospital of Heraklion, Staurakia, 71110 Crete, Greece. apapadak@edu.med.uoc.gr

Medical Physics

|April 2, 2011

Summary

A new laser-based optical-CT scanner offers fast, accurate 3D radiation dosimetry using polymer gel dosimeters. This system shows improved linearity and reduced noise compared to traditional methods, enabling precise dose measurements.

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Published on: February 20, 2021

Area of Science:

Medical Physics
Radiation Dosimetry
Optical Imaging

Background:

Accurate three-dimensional (3D) radiation dosimetry is crucial for radiotherapy and radiation protection.
Traditional optical-CT scanners face limitations in linearity and noise, affecting dose readout accuracy.
Polymer gel dosimeters offer potential for high-resolution 3D dose measurements.

Purpose of the Study:

To introduce and evaluate a novel laser-based optical-CT scanner for 3D radiation dosimeter readout.
To assess the performance of the laser-based system in terms of linearity and noise compared to existing systems.

Main Methods:

A diode laser, cylindrical lens, motorized linear rail, rotation stage, and CCD camera formed the scanner.
The system operated in a translate-rotate mode, with two configurations based on lens orientation.
Normoxic polymer gel dosimeters were irradiated to known doses (up to 60 Gy) and scanned.

Main Results:

The laser-based optical-CT scanner demonstrated linear dose response up to 60 Gy (r² = 0.997).
This linearity surpasses conventional wide-field illumination scanners, which are linear up to 32 Gy (r² = 0.996).
The laser system exhibited lower noise levels in reconstructed attenuation coefficient maps compared to the wide-field system.

Conclusions:

A novel laser-based optical-CT scanner was successfully developed for rapid 3D dosimetry with polymer gel.
The system minimizes the impact of scattered light, preserving measurement accuracy.
Further noise reduction techniques are recommended for optimal attenuation coefficient reconstruction.