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MRI-based IMPT planning for prostate cancer.

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Summary

Magnetic Resonance for Calculating Attenuation (MRCAT) images can replace CT scans for prostate cancer proton therapy planning. This reduces patient imaging dose while maintaining accurate treatment delivery and contouring.

Keywords:
MRIPBSPlanningProstateProton therapyRobustness

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Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Image Processing

Background:

  • Proton therapy requires accurate relative proton stopping power ratio (RSP) for dose calculations.
  • Conventional RSP mapping uses Hounsfield Units (HU) from computed tomography (CT) scans, delivering additional radiation dose.
  • Magnetic resonance imaging (MRI) is preferred for prostate cancer segmentation due to its lack of ionizing radiation.

Purpose of the Study:

  • To evaluate the clinical applicability of synthetic CT images generated from MRI (MRCAT) as a substitute for CT in intensity modulated proton therapy (IMPT) planning for prostate cancer.
  • To assess if MRCAT-based IMPT plans are clinically viable and comparable to CT-based plans.

Main Methods:

  • MRCAT technology was used to generate synthetic CT images from MRI data for ten prostate cancer patients.
  • Intensity modulated proton therapy (IMPT) plans were created using both MRCAT images and the original planning CT scans.
  • Robustness analyses were conducted to assess plan sensitivity to setup shifts and range uncertainties.

Main Results:

  • IMPT plans generated on MRCAT images showed excellent agreement when recomputed on the corresponding planning CT scans.
  • Dose perturbations resulting from setup shifts and range uncertainties were within clinically acceptable limits.
  • The findings demonstrate the clinical viability of using MRCAT for IMPT planning.

Conclusions:

  • Substituting CT-derived RSP images with MR-converted images (MRCAT) is clinically acceptable for prostate cancer IMPT planning.
  • This approach enhances contouring accuracy and reduces the overall imaging dose for patients.
  • MRCAT offers a promising alternative for dose-less imaging in proton therapy.