The future of image-guided radiotherapy-is image everything?

Area of Science:

• Medical Physics
• Radiation Oncology
• Radiotherapy Technology

Background:

• Magnetic resonance (MR)-based image-guided (IG) radiotherapy is a rapidly advancing field.
• All-in-one MR treatment units (MR-linacs) promise enhanced tumor visualization and personalized treatment.
• Significant engineering and physical challenges accompany the development of MR-linac technology.

Purpose of the Study:

• To critically evaluate the proposed benefits of MR-linac technology in radiotherapy.
• To examine the technical challenges and practical considerations of implementing MR-guided radiotherapy.
• To discuss the implications of MR-linacs for personalized RT, image biomarker discovery, and global healthcare equity.

Main Methods:

• Review of current MR-linac designs and their associated engineering solutions.
• Analysis of the potential advantages, including improved tumor visibility and online adaptation.
• Discussion of the validation requirements for image biomarker-based personalized RT (RT).

Main Results:

• MR-linacs offer superior image quality, potentially improving tumor visualization.
• Technical challenges in MR-linac design are often managed rather than eliminated.
• The clinical utility of online adaptation and the validation of MR-based image biomarkers require further investigation.
• Cost and global healthcare equity are critical considerations for widespread MR-linac adoption.

Conclusions:

• MR-linacs represent an exciting technological advancement in radiotherapy with significant research potential.
• Careful validation of proposed benefits, including personalized RT and image biomarkers, is essential.
• The practical implementation of online adaptation needs further study to identify patient benefit.
• The high cost and potential impact on global healthcare inequalities must be addressed alongside technological development.