Xref: utzoo sci.med:8911 sci.physics:6049 sci.electronics:5255
Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!bbn!rochester!dietz
From: dietz@cs.rochester.edu (Paul Dietz)
Newsgroups: sci.med,sci.physics,sci.electronics
Subject: Re: Biomedical Measurement "Challenge": Cardiac Output
Keywords: biomedical measurements, cardiac output, instrumentation
Message-ID: <1989Feb20.111359.4763@cs.rochester.edu>
Date: 20 Feb 89 16:13:59 GMT
References: <13175@steinmetz.ge.com> <1989Feb19.161324.2076@gpu.utcs.toronto.edu>
Reply-To: dietz@cs.rochester.edu (Paul Dietz)
Organization: U of Rochester, CS Dept, Rochester, NY
Lines: 13

How about using the Mossbauer effect to measure the Doppler shift of
gamma rays from small tracer particles?  This extraodinarily sensitive
phenomenon can measure speeds as low as a few centimeters per second.
One might use it to get a measure of the amount of blood near the
heart moving at a certain velocity relative to the detector.

I read somewhere the Mossbauer effect has been used to measure the
velocity distribution in ant colonies (given them sugar-coated tracer
particles).  Also, I think someone has used it to measure the vibration
of eardrums.

	Paul F. Dietz
	dietz@cs.rochester.edu