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My SBRT treatment at Mayo used 3mm margins. The prep was placement of 4 gold seed fiducial markers and the SpaceOAR via a transperineal approach all while I was under general anesthesia in an OR. It was pretty much a non-event although I can't imagine doing it under just local anesthesia in a doctors office. The "ink markers" you are referring to are applied on the external skin in three areas during the "simulation" which is when they take precise imaging and measurements to plan the radiation targeting (about 7-10 days before your first radiation treatment). I was offered stickers or permanent tattoos. Since I'm a daily lap swimmer, I opted for the permanent tattoos which are three very small dots about the size of a small freckle where nobody is going to see them anyway. This was just a very minor skin prick. So back to the fiducial markers and SpaceOAR-- my RO feels that even with the MRI imaging/tracking, these fixed markers make the process much more precise. And the SpaceOAR, some say it's not needed with the MRI tracking but he's yet to have a single bowel issues arise from radiation when the device was used. Enough said for me. Others will have different experiences and treatment plans but this was mine. Hardest part for me was just the waiting. Best wishes! Reach out if you want to chat.
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According to the Viewray MRIdian website Mayo does not offer it at any of their sites. For SBRT (Stereotactic Body Radiation Therapy) Mayo uses it as their primary RT option (I think). Did you have only one tumor they treated which required the 4 fiducial markers? Since I have three tumors will I need 12 fiducial markers?? Is the idea to place the markers "around" the tumor or place them "inside" the tumor? It sounds like you received Proton Beam SBRT over 5 treatments at Mayo. The stated margins for PB SBRT are 4-6mm from what I've read about. MRIdian on the other hand has it down to 2mm. The SpaceOAR after a few months gets absorbed by the body. Gee, now that you have 4 fiducial markers inside you the police will be able to identify you if you go wandering off....just like your friend's dog!! At this time my Decipher test score is 0.37 (Low Risk) and am trying to decide on using Active Surveillance or 5 MRIdian treatments. The next PSA test will be in a week and am hoping it will remain at 3. So far have you had any blood in either your urine or semen? I am glad to hear you exercise. I have been working out 3 days/week and walking a mile each time. Thanks, will await your reply.
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Thank you for your comments on your SBRT treatment at Mayo. Did you have the MRIdian Viewray treatment or something else? If so, was it at Mayo in Rochester, FLA or Arizona? How are you doing now with side effects, etc.?? Thank you.