MRI-only treatment planning: benefits and challenges

Area of Science:

• Medical Physics
• Radiation Oncology
• Radiological Imaging

Background:

• Increasing use of magnetic resonance imaging (MRI) in radiation therapy.
• Evidence suggests improved target delineation accuracy in MRI-guided radiation therapy can enhance clinical outcomes.
• Challenges include patient motion and geometric accuracy during MRI acquisition.

Purpose of the Study:

• To review concepts and techniques for implementing MRI-only workflows in radiation therapy.
• To highlight considerations for accurate MRI acquisition in the treatment position.
• To discuss the generation of synthetic CT and digitally reconstructed radiograph images from MRI data.

Main Methods:

• Review of existing literature on MRI-only workflows in radiation therapy.
• Discussion of techniques to mitigate patient motion during MRI acquisition.
• Explanation of methods for generating electron density maps (synthetic CT) and DRRs from MRI.

Main Results:

• MRI-guided radiation therapy shows promise for improving cancer treatment accuracy.
• Successful implementation requires addressing patient motion and ensuring geometric accuracy.
• Synthetic CT and DRR generation from MRI are crucial for dose calculation and image guidance.

Conclusions:

• MRI-only workflows are feasible for radiation therapy.
• Careful consideration of motion management and image quality is essential.
• These advancements can lead to improved precision and outcomes in radiation oncology.