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Physics of UltrasoundFrom: Wolfgang Moroder, MD (womorode@tin.it)Tue Oct 2 01:56:35 2001
Scanning a 9 cm large pelvic cyst with a diffuse fine moderatly echogenic content (endometriosis?) I observed, for the first time, a phenomenon of the small particles moving constantly away from the 7 MHz TV probe. I could even measure the speed impressed which was aroud 0.3 cm/s. With color it was more evident with a "blush" showing that the particles were accelerated by the approach of the probe. Now, my question is if it is the heat or the mechanical action of the ultrasound which impresses the movement to the particles? What kind of content (particles) could show such a phenomenon and finally if this could have some diagnostic value for the nature ot the cyst?
-- Wolfgang Moroder, MD Prenatal Unit Bolzano General Hospital Italy
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