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Re: Physics of Ultrasound From: James S Smeltzer MD (gaperina@mindspring.com) Sun Oct 28 14:11:32 2001 Messages sorted by: [ date ][ thread ][ subject ][ author ] Next message: Loren Westman: "Ring IUD" Previous message: DuBose, Terry: "Re: choroid plexus" In reply to: Wolfgang Moroder, MD: "Physics of Ultrasound" Next in thread: udaya kumar: "Re: Physics of Ultrasound" A reflection of the sound wave transfers energy to the particle in question as well. As the sound is kinetic energy, this should also be kinetic energy. The velocity imparted would be related to the ultrasound power (at the site, not the probe head), the transferrence of energy - related to the echogenicity or change of acoustical impedence, the viscosity of the fluid and the particle size. These may be potentially useful in determining the nature of the cyst, but I am not aware of anyone who has studied this. There may be too many unknowns. A simple study identifying how the velocity changes with changes in acoustical power, the sieve results vs velocity (size may cancel out - as the large and small seem to be similar in velocity - so streaming of the fluid is possible, which could also have a thermal origin). Interesting idea, though. Let us know how it turns out. Jim Smeltzer At 02:01 AM 10/2/2001 -0500, you wrote: >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 > Next message: Loren Westman: "Ring IUD" Previous message: DuBose, Terry: "Re: choroid plexus" In reply to: Wolfgang Moroder, MD: "Physics of Ultrasound" Next in thread: udaya kumar: "Re: Physics of Ultrasound"

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