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Validation of a Prototype Optical Computed Tomography System.

Seyed Salman Zakariaee1, Mikaeil Molazadeh1, Abbas Takavar1

  • 1Department of Medical Physics and Biomedical Engineering, Faculty of Medicine, Tehran University of Medical Sciences, Tehran, Iran.

Journal of Medical Signals and Sensors
|June 30, 2015
PubMed
Summary
This summary is machine-generated.

A new optical computed tomography (OCT) scanner offers a cost-effective alternative for reading gel dosimeters used in radiation therapy. This validated system accurately quantifies absorbed doses, improving treatment safety and minimizing side effects.

Keywords:
Magnetic resonance imagingoptical computed tomographypolymer gel dosimetryspectrophotometer

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Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Biomedical Engineering

Background:

  • Gel dosimeters provide 3D dose information crucial for minimizing side effects in radiation cancer therapy.
  • Magnetic Resonance Imaging (MRI) is the gold standard for gel dosimeter readout but faces accessibility and cost challenges.
  • Optical Computed Tomography (OCT) presents a promising, more accessible alternative for gel dosimeter analysis.

Purpose of the Study:

  • To develop and validate a prototype optical scanner for gel dosimeter readout.
  • To compare the performance of the fabricated OCT system with conventional spectrophotometry and MRI.

Main Methods:

  • Irradiated N-isopropylacrylamide (NIPAM) and polyacrylamide gel (PAGAT) dosimeters were scanned using a fabricated OCT system and a conventional spectrophotometer at 632 nm.
  • Absorbance measurements were correlated with dose-response sensitivity.
  • Results were validated against a 1.5 T MRI system.

Main Results:

  • The fabricated OCT system demonstrated dose sensitivity values comparable to conventional spectrophotometry for both NIPAM and PAGAT gels.
  • Optical dose sensitivity for NIPAM gels was 0.0442 (OCT) vs. 0.0453 (spectrophotometer); for PAGAT gels, it was 0.0242 (OCT) vs. 0.0244 (spectrophotometer).
  • MRI-based dose sensitivity was higher (0.1904 for NIPAM, 0.113 for PAGAT), but OCT results showed fair agreement with spectrophotometry, indicating acceptable accuracy.

Conclusions:

  • The fabricated OCT system is capable of accurately quantifying absorbed doses in polymer gel samples.
  • This development offers a viable, potentially more accessible and cost-effective alternative to MRI for gel dosimetry.
  • The validated OCT system can aid in optimizing radiation cancer treatments by providing precise 3D dose measurements.