For SRS, do you prefer fixed kV imaging (e.g. ExacTrac) or cone-beam CT?

In our practice (at U Rochester), we have the ExacTrac system which captures orthogonal X-rays for each couch rotation, using 2 imaging sources on the floor and 2 imaging detectors on the ceiling (in a criss-cross orientation). So, you never get typical AP and lateral films (which I have become accu...

I think of frameless SRS imaging/alignment as being a 2-part process:

1. Initial setup imaging.
2. Image guidance throughout treatment once you start doing couch kicks.

For the initial setup, both CBCT and ExacTrac are excellent solutions. I can attach a couple of papers (others are out there) that both s...