Interesting and important query BB.
First point to mention is that we all have about
a one in forty chance of getting cancer in our lifetimes.
This site had a good list of comparisons of xray doses:www.radiologyinfo.org/en/safety/index.cfm?pg=sfty_xray
and at this one you can input your own data to work out your totatl dose from all sorts of sources:www.ans.org/pi/resources/dosechart/
During my RT 2 xrays at right angles were taken at regular intervals to check the position of things. This was done on day one, and then after every 5 sessions. At the beginning of the last week two additional xrays were taken after something was found to have moved by two millimetres.
The beep made by the machine when taking these xrays was very very short compared to the beep during each dose of RT, indicating that the dose was much smaller.
From what I have read the initial CT scan used for mapping the whole area gives a 3D image, that used for targetting before RT uses a 2D image. I was under the impression that the CT scan prior to RT was simply enough to locate certain specific reference points in the target area. Worth asking about
it though I think. And again the time the CT scan takes is an indication of how big a dose you are receiving. (I cannot imagine anyone could be getting 35 big CTscans in a row)
Equivalence is also relevant. The dose given/absorbed must also be seen in terms of the percentage of your body (by weight) to which that dose is given. 20gy is a fatal dose for a human if given to the entire body thus when we get say 70Gy that is on the basis that the prostate/prostate bed is only a few ounces of a body that weighs many pounds.
This radiaton is at least trying to make us better. Radiation from things that are no benfit are much worse. I wanted to play a RT joke on folk by painting my belly with fluorescent make-up but that is no longer sold here as it gives off too much dose. And I remember using a Geiger-counter to test radioactive samples in a labm, and though we had to handle them with special gloves and tongs, the dials of our wrist-watches actually gave bigger readings.
I mustn't get too scientific about
stuff I don't know a lot about
. My RT team were happy to answer all questions I asked them, so ask the experts.
Age at Dx 48 No Family history of Prostate Cancer
Married 25 years, and I cannot thank my wife enough for her support.
April 2009: PSA 8.6 DRE: negative. Tumour in 2 out of 12 cores. Gleason 3+3.
RALP (nerve-sparing) at AVL-NKI Hospital Amsterdam on 29th July 2009. Stay 1 night.
Partial erections on while catheter still in. Catheter out on 6th Aug 2009.
Dry at night after catheter came out
Post-op Gleason 3+4. Tumour mainly in left near neck of bladder.
Left Seminal Vesicle invaded, (=T3b!)
no perineraul invasion, no vascular invasion. clear margins,
Erection 100% on 15th Aug 2009, but lots of leaking of urine
Stopped wearing pads on 21st Sept 2009
Pre-op style intercourse on 24th Oct 2009 !! No use of tablets, jabs, VED etc. but...
Nov 17th 2009 PSA = 0.1
Can still get erections okay, and almost no leaking of urine, but since December 2009 I don't have orgasms, instead I just have intense pain in place where prostate used to be.
Mar 17th 2010 PSA = 0.4!!! referred to radiation therapist
April 13th 2010 CT scan.
April 28th 2010 Started Radiation Therapy (66Gy - 33 sessions)