Ken: Cyberknife radiation if the most accurate of any of the radiation treatments and probably has the least side effect, at least for smallish tumors, say less than 4 cm. I had ck treatment for a 7 cm tumor and now I have pneumonitis. It is the only radiation therapy that can account for tumor movement during breathing. It has sub millimeter accuracy while imrt can be accurate to within 2 or 4 millimeters, but can often be bigger, because of the movemen of the tumor. There are methods to minimize the effect of tumor movement in imrt. One method is to use an onboard imager to allow the computer to know exactly where the tumor is just before zapping. They call this image guided radiation therapy (IGRT). Some places also use a gating technology. They track the up and down motion of the chest and do the zapping at the top of the up cycle. Some places don’t attempt to account for tumor movement at all and just plan on a target field that the tumor will occupy during the breathing cycle, which is where you would get the most lung damage, maybe as much as 2 or 3 cm. If you are going to do imrt, find a place that uses the IGRT technique. Cyberknife is the best though, but there could be insurance hassles. One nice ting about cyberknife, is that you would be done in 3 treatments for a smallish tumor. IMRT would take 33 treatments.
http://www.accuray.com/patientinfo/index.aspx
http://www.elekta.com/healthcare_intern ... herapy.php
Don M