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. Author manuscript; available in PMC: 2009 Aug 1.
Published in final edited form as: Ultrasound Med Biol. 2008 Mar 12;34(8):1200–1208. doi: 10.1016/j.ultrasmedbio.2008.01.001

Fig. 4.

Fig. 4

(a) End-tidal CO2 from subject 3 along with the pulse amplitude measurements from a single sample volume. (b) Pulse amplitude versus end-tidal CO2 from the same sample volume along with the best-fit line with first-order linear regression. “pa” in the inset equation is pulse amplitude and “CO2” is the end-tidal CO2 measurement.