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$Comparison of Agreement and Accuracy using Binocular Wavefront Optometer with Autorefractor and Phoropter$

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Fully 3D refraction correction dosimetry system.

Rakesh Manjappa¹, S Sharath Makki, Rajesh Kumar

¹Department of Physics, Indian Institute of Science, Bangalore 560012, India.

Physics in Medicine and Biology

|February 4, 2016

Summary

This summary is machine-generated.

This study introduces a new 3D image reconstruction algorithm (ART-rc) to correct for light refraction in polymer gel dosimeters. The algorithm improves dose distribution accuracy by accounting for refractive index mismatches, enhancing radiation therapy planning.

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Area of Science:

Medical Physics
Radiological Sciences
Polymer Science

Background:

Polymer gel dosimeters are used in radiation therapy to measure dose distributions.
Light refraction within the dosimeter causes artifacts in reconstructed images, affecting accuracy.
Existing reconstruction methods struggle with refractive index mismatches, especially in 3D.

Purpose of the Study:

To develop and evaluate a 3D image reconstruction algorithm (ART-rc) that corrects for refractive index mismatches in polymer gel dosimeters.
To assess the impact of different refractive-index matching media on reconstruction accuracy.
To compare the performance of ART-rc with conventional algorithms like ART and FDK.

Main Methods:

Developed a 3D algebraic reconstruction technique-refraction correction (ART-rc) algorithm.
Conducted simulation and experimental studies using 2D CCD measurements from various views.
Investigated the use of different refractive-index matching media (e.g., water).
Compared ART-rc with conventional Algebraic Reconstruction Technique (ART) and Filtered Backprojection (FDK) algorithms.

Main Results:

The ART-rc algorithm effectively corrects for refractive index mismatches both at the boundary and within the dosimeter.
Using water as a refractive-index matching medium, ART-rc increased the usable radius by 6.4% in the central region compared to conventional ART.
Cone-beam tomography reconstructions showed deterioration in some planes due to un-scanned regions.

Conclusions:

Refraction correction is crucial for achieving quantitatively accurate dose reconstructions in polymer gel dosimetry.
The ART-rc algorithm offers significant improvements in image quality and dose accuracy.
Refraction modeling is essential for array-based scanners to accurately identify refracted rays.