Table 1.

Opportunities and challenges of MR-only workflow for prostate radiotherapy.

Opportunities	Challenges
Removes inaccuracies of MR-CT fusion	Need for electron density information
Improved soft tissue contrast of the prostate on MR	Need pelvic wide field of view MR (to skin surface)
Improved efficiency	Geometric fidelity of wide-field MRI
Ability to contour dominant lesion boost on MR	Lack of MR capacity in radiotherapy departments
Remove requirement for fiducials if delivery with MRgRT	Need for back up plan (and fiducials) if only one MR-Linac in department