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And, plus a small space around it in all directions. Cost of viagra in ontario Here we have used 7mm in each direction, except toward the rectum where the distance is only 4mm. take viagra 20mg best results This is to allow a margin for the possibility that some cancer cells may have escaped through the wall of the prostate. The ptv is the real target for radiation therapy, so hereafter we'll show just the lavender circle. viagra plus fort que viagra The illustration above shows what would happen if we tried to treat the prostate with a single radiation beam from the front. generic viagra online The yellow line is 100%, so the whole ptv receives the prescribed radiation dose. floridalighttacklecharters.com/thq-buy-cheap-viagra-canada-di/ (we will keep the yellow line covering the prostate in all the subsequent pictures, for consistent comparisons. cheap generic viagra ) with a single beam, most of the bladder receives 20% more radiation than desired. We must do better than this! viagra without a doctor prescription Above, two anterior oblique radiation beams have been used. what does viagra cost per pill The yellow again covers the ptv, and the amount of bladder getting too much radiation has been reduced significantly, but this is still not a good plan. We need to further reduce the bladder dose and get more even distribution of dose in the ptv. With three beams – one from the front and two angled from the back – things start to look better. what does viagra cost per pill We have eliminated any areas where the dose is 10% or 20% too high, and the prostate still gets the same 100% dose. cheap viagra But the area getting 105% covers the rectum, which is what we wanted most to protect. Going from two beams to three made a big improvement, so here we have gone to seven beams. This is much better. Now the only part getting more than 100% is actually within the prostate, which might even be a good thing in the ability to kill more cancer cells there. Youtube sahan viagra But a major part of the rectum is still getting as much radiation as the ptv, which increases the side effects and risk of later complications. Increasing the amount of radiation coming from the sides can help to reduce the dose to the rectum, but in doing so it has increased the dose to the hip joints. Pfizer viagra movie We need more options! viagra for sale It's time at last to introduce intensity modulation. howtosmudge.com/pjn-cheap-generic-viagra-online-bn/ In the above plan only five beams are used, instead of seven, but the intensity of each beam is no longer flat across its width. viagra women youtube Now each beam can be more intense in one place than another, as you can see from the unusual entrance pattern in the beams at 4 and 8 o'clock. Now we have succeeded in covering the whole ptv with the yellow 100% line, there is no hot spot in the center, and the dose to the rectum falls very quickly to 40%, which will be well tolerated. best place buy viagra online yahoo answers This is still not a perfect plan; there is a little yellow spot and a tiny red spot that can probably be reduced with a little fine-tuning. buy viagra But this imrt plan is much better than any of those above. Above is yet another imrt plan. viagra online This one is done by rotating the radiation beam around the patient while doing the modulation simultaneously; it's the equivalent of perhaps 50 different beam angles, each one with optimized intensity. With this plan. cheap viagra fast shipping overnight
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