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Radiotherapy planning using MRI.

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Magnetic resonance imaging (MRI) is increasingly used for radiotherapy (RT) planning, offering diverse contrast mechanisms. Challenges include acquiring accurate images in treatment position and estimating electron density for improved RT guidance.

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Area of Science:

  • Medical Physics
  • Radiotherapy Technology
  • Diagnostic Imaging

Background:

  • Magnetic resonance imaging (MRI) utilization in radiotherapy (RT) planning is growing.
  • MRI offers various image contrast mechanisms beneficial for RT planning.
  • Current applications and future developments in MRI-guided RT are being explored.

Purpose of the Study:

  • To review MRI contrast mechanisms for RT planning.
  • To identify and discuss challenges in MRI for RT.
  • To explore clinical applications and real-time MRI-guided RT.

Main Methods:

  • Review of MRI contrast mechanisms.
  • Analysis of requirements for MR imaging in RT treatment position.
  • Discussion of geometric accuracy, motion minimization, tissue marker demonstration, and electron density estimation.

Main Results:

  • MRI provides diverse contrast mechanisms applicable to RT planning.
  • Key challenges include image acquisition in treatment position, geometric accuracy, motion artifacts, and electron density determination.
  • Specific clinical applications and real-time MRI-guided RT are under development.

Conclusions:

  • Addressing challenges in MRI for RT planning is crucial for its expanded use.
  • Accurate geometric and electron density information from MRI can enhance RT precision.
  • Real-time MRI-guided RT holds promise for future cancer treatment.