Hi Mr. Bill,
I was treated with the Varian technology in 2008. Trilogy is the same as what was used on me but Trilogy is set up to treat brain, lung, and other cancers in addition to the prostate. The medical group that I used treated only prostate cancer. Rapidarc is a recent improvement. Basically the technology I used made a 360 degree rotation but it stopped at seven stations along the way to deliver the dose each time. WIth Rapidarc it is one continuous movement with the collimeters adjusting continuously to shape the dose. Primary advantage is time if you are the patient and revenue if you are the medical facility.
Varian's website lists all of the facilities that own their technology by city and state. After that I would suggest calling the site that has the machine and they will answer any questions you have.
Diagnosed 04/10/08 Age 58
Gleason 4 + 3
DRE palpable tumor on left side
100% of 12 cores positive for PCa range 35% to 85%
Bone scan and chest x ray clear
CT scan shows potential lymph node involvement in pelvic region
IGRT/IMRT with adjuvant HT (lupron) 2yrs