Do you utilize urethral catheterization at the time of simulation for prostate SBRT planning?

The need for a urethral catheter at simulation depends somewhat upon your dosing technique/strategy, and also whether a planning MRI is obtained. The reason for this is the need for a catheter to precisely define the location of the urethra depends on whether there will be dose sufficient to cause injury to a serial structure in close proximity to areas receiving higher doses.

If dosing relatively uniformly (for instance to 36.25 Gy in 5 fractions with hot spots only around 40 Gy) then the precise location to the mm of the urethra may be less critical as this structure should be able to tolerate those levels of dose - and receives prescription dose with small hot-spots through the full course of every conventional XRT treatment as well with...