> JA>   If I am not mistaken, the sound being used surgically is
 >   >extraordinarily high pitched, and I am not sure that it is audible.
 >    Lithotripsy partially immerses the patient in a warm solution of
 >    specific density. Then, beams of ultrasound traveling through the
 >    liquid and tissues ultimately interfere at selected foci.  Resonance
 >    effects occur in obstructive bodies, causing fractures.
   - - - - Bonnie- - - - Sorry for wandering here. - - - - - - -
       With the liquid of a given density between the emitter and the 
intended area of destruction/fracture, would distance not play a critical
part? I ask because I have been trying to understand the physics of audio
cabling and some of the exotic designs that are available, all claiming to
have discovered and magically overcome the problems and how loudspeakers
must overcome distances. I noticed that loudspeakers sound dramatically 
different at different distances, even when the sweet spot is adjusted.
High frequency sound drops like a rock being thrown and low frequency seems 
to 
carry much farther. Just as shorter speaker cables are advised to combat 
signal loss.
       Certainly, just like cables and current/a signal, the fluid has to
have a specific resistance that changes dramatically as the sound waves 
pass through the liquid and hit a gel like the body. Too far back with the 
emitter and no fracture. Too close and damage beyond the intended target. Or 
so I would guess. 
   I have been reading about the founder of Purist Audio (PAD) that is not 
only transmitting light down his cables for shielding, he has cables filled 
with a liquid for the same reason. It might even be water. They are ultra 
expensive and ....... well, it all seems kind of nuts to me. But then again I 
haven't noticed Tara Labs or anyone calling me for a consult, either 8-)
Cheers, John
Windows 95:  The bugs go in before the names goes on! Dah!
 
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