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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. 6.

Fig. 6

BMode image (left column) from the four subjects along with the expected percent change in pulse amplitude for a decrease in end-tidal CO2 from 40 mmHg to 20 mmHg (right column). Pulse amplitude percent change is only shown for sample volumes where the linear regression p-value of pulse amplitude onto end-tidal CO2 was less than 0.01.