Great to see you, and I hope all is well.
IMRT stands for Intensity Modulated Radiation Therapy. Layman terms: Basically they use lead pellets and air to shape the beam during treatment. This is done in a matter of seconds by computer. Mine was done in seven angles and each angle was hit with about
five shapes each. In fifteem minutes they hit my prostate bed and surrounding areas with 35 shapes a day. As the treatments progressed, the shapes were altered to intensify the beam at prostate bed and lymph nodes I still had, while being shaped in a way to not hit other organs like my rectum and bladder.
there are other methods to deliver IMRT. IGRT (Image Guided RT) uses a CT scan to guide the beam and reshape it before each dose. This is more precise than my seven angle version and takes into account the daily changes in our body.
Another method is Tomotherapy. Also image guided by CT Scan, Tomotherapy uses IMRT from 53 angles simultaneously by a rotating gun.
Which one is best? It really depends on each case and how accurate the beam needs to be. For me with the 4 positive margins, IMRT with seven angles was not as accurate, but would likely hit stray cancer cells better.
Boy I babble on too much sometimes...
Age 46 (44 when Dx)
Pre-op PSA was 19.8
Surgery on Feb 16, 2007 @ The City of Hope
Post-Op Pathology: Gleason 4+3=7, positive margins, Extra Prostatic Extension (EPE)
Bilateral seminal vesicle invasion (SVI); Stage pT3b, N0, Mx
HT began in May, '07 with Lupron and Casodex 50mg (2 Year ADT)
IMRT radiation for 38 Treatments ending August 3, '07
Current PSA (September 17 '08): <0.1 ~ Undetectable!
You can visit my Journey at:
Tony's Prostate Cancer InfoLink Page