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Biotech / Medical : Caprius(CAPR), Breast MRI(former ANMR/MAMO) -- Ignore unavailable to you. Want to Upgrade?

To: luis a. garcia who wrote (2138)	11/12/1997 7:22:00 AM
From: James L. Fleckenstein	Read Replies (1) \| Respond to of 2615

Luis, you can tell that I am delighted to have Zeev here to keep your unbridled enthusiasm and fantasies checked by reality. and thanks for posting the patent. Phase and frequency of spinning nuclei are the two features that under slight imposed gradients in the magnetic fields allow for them to be spatailly localized and hence an image created. Because the water and fat peaks are som much further apart at high field, it is relatively easy to apply a specific energy pulse, targetted to the fat peak selectivley to saturate it. At 0.5T the chemical shift is too small to reliably accomplish this. Some years ago, a guy named Tom Dixon concocted a technique OTHER tthan frequency-selective pulses to suppres fat and that is the phase-selective technique that the ANMR patent enlarges upon. The techniqeus sound highly similar especially through the first paragraph of the technique. The problem with this technique is that it doesn't work very well, otherwise all the 0.5T systems would use it. In fact there are a few that do but for some reason you don't see it touted anywhere except in proof-of-principle articles. I will gie you the benefit of the doubt: Maybe CAPR has found a fundametnal way to improve the Dixon technique. The proof is inthe pudding. As of last April, however, my sources say it didn't work well enough to depend upon. I will report back on this issue after RSNA.