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MRI-based computed tomography metal artifact correction method for improving proton range calculation accuracy.

Peter C Park1, Eduard Schreibmann2, Justin Roper2

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This study introduces an MRI-based method to correct computed tomography (CT) artifacts, significantly improving proton therapy dose calculations. The technique enhances CT image quality and proton range accuracy for patients with severe artifacts.

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Area of Science:

  • Medical Physics
  • Radiotherapy Technology
  • Image Processing

Background:

  • Computed tomography (CT) artifacts critically impair dose calculation accuracy in proton therapy.
  • Magnetic resonance imaging (MRI) is increasingly utilized in radiation therapy clinics.
  • Accurate dose calculation is essential for effective proton therapy outcomes.

Purpose of the Study:

  • To develop and validate an MRI-based method for correcting CT artifacts.
  • To improve the accuracy of proton range calculations in the presence of CT artifacts.
  • To leverage the growing use of MRI in radiation oncology for enhanced treatment planning.

Main Methods:

  • Developed an MRI-based CT artifact correction technique.
  • Utilized 3D and 2D deformable image registration (DIR) to coregister MRI and CT images.
  • Mapped artifact-free CT Hounsfield units (HU) using paired MRI pixel intensities to predict corrected HU values.
  • Validated the method on simulated metal artifacts and applied it to four clinical cases.

Main Results:

  • Achieved substantial quantitative and qualitative reduction in CT artifacts.
  • Reduced mean HU error from 495/370 HU to 108/92 HU in simulated brain/head and neck images.
  • Decreased absolute mean proton range errors from 2.4 cm/1.7 cm to under 2 mm.

Conclusions:

  • The developed MRI-based CT artifact correction method effectively enhances CT image quality.
  • This technique significantly improves proton range calculation accuracy.
  • The method offers a valuable solution for patients experiencing severe CT artifacts in proton therapy.