For cervical cancer intracavitary brachytherapy, do you use contrast when using CT-based planning to better visualize the ureters?

We normally do MRI based planning and the ureter can be identified and contoured on MRI.

For only CT based, we do out diluted contrast in bladder for bladder contouring but do not go to the ureter.

Rodríguez-López et al., PMID 33065181

Koerner et al., PMID 34980569