Hi TM and welcome!
Same as shoegirl as I'm having my CK next week here in Boston. Same reason as well... accuracy. My AN is still in the left IAC and accuracy is the key for me.
I know that, based on my research (Mark, correct me if I'm wrong, ok?):
CK has an accuracy of approx .87mm..... GK has an accuracy of 1mm-2mm... FSR accuracy falls around 2mm-4mm. So, for me, in weighing this all out, the reason I went with CK is ... if we are going to hit the thing, it better hit it as my AN is still smaller compared to others (only 1cm x 7mm x 4mm) and still in the IAC.
All of these choices are very viable. I think it is personal preference if you want the headframe or not, as well as 1 dose with GK vs. Fractionated doses (anywhere from 3days to 28 days) course of treatment.
I learned that:
CK will be 3-5 days (5 for me) with minimal side affects (hopefully). Mask, no headframe, highly accurate. Short term available data of efficacy as it's not been in existance as long as other radio-treatments, but data looks good thus far. Hearing preservation runs approx 60-85% of current hearing levels.
GK is extremely viable, one dose, temporary discomfort of headframe (from what I have read and researched). A proven track record of efficacy for almost 30 years. Didn't think hearing preservation % was as good as CK but hoping someone here can confirm.
FSR (as well as Proton Treatments) very viable options as well. Proven treatments in their histories although accuracy not as good as other options. Image guidance used during treatments, more "rigid" mask to hold head in place. Didn't think hearing preservation % was as good as CK but hoping someone here can confirm.
These are just things to share off the top of my poor little head but a head start. Hoping others will chime in with their thoughts as well.
TM, welcome... we're all here for you!
Phyl