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[Evaluation of Absorbed Dose by MRI Read-Out].

Shuji Usui1

  • 1Department of Clinical Radiology, Hiroshima International University.

Igaku Butsuri : Nihon Igaku Butsuri Gakkai Kikanshi = Japanese Journal of Medical Physics : an Official Journal of Japan Society of Medical Physics
|November 21, 2017
PubMed
Summary

Magnetic resonance imaging (MRI) can measure 3D radiation dose distributions using gel dosimeters by analyzing T1 and T2 relaxation rates. This study details MRI techniques and factors impacting precision for accurate dose assessment.

Keywords:
dose verificationmagnetization transfer contrastrelaxation ratethree dimensional

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Area of Science:

  • Medical Physics
  • Radiotherapy
  • Imaging Science

Background:

  • Three dimensional dose distribution is crucial for radiotherapy planning.
  • Gel dosimeters offer a method for measuring radiation dose distributions.
  • Magnetic resonance imaging (MRI) scanners are widely available in clinical settings.

Purpose of the Study:

  • To describe MRI techniques for reading out gel dosimeters.
  • To identify factors affecting the precision of MRI-based dose measurements.
  • To present magnetization transfer as an alternative method for specific gel types.

Main Methods:

  • Utilizing spin echo, multiple spin echo, and inversion recovery imaging sequences to measure T1 and T2 relaxation rates.
  • Analyzing signal-to-noise ratio, temperature, coil selection, and imaging artifacts.
  • Exploring the magnetization transfer method for low-density foam gel dosimeters.

Main Results:

  • T1 and T2 relaxation rates correlate with absorbed radiation dose.
  • Precision is influenced by factors such as signal noise ratio, temperature, and imaging artifacts.
  • Magnetization transfer offers a potential alternative for specific gel dosimeter applications.

Conclusions:

  • MRI is a viable tool for evaluating radiation dose distributions using gel dosimeters.
  • Understanding and controlling factors affecting MRI precision is essential for accurate dose assessment.
  • Alternative methods like magnetization transfer can enhance gel dosimetry capabilities.