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. Author manuscript; available in PMC: 2009 Aug 10.
Published in final edited form as: Opt Express. 2009 Jul 20;17(15):12571–12581. doi: 10.1364/oe.17.012571

Fig. 2.

Fig. 2

Diagram of the protocol used for DCS (top) and TCD (bottom) measurements. DCS and TCD measurements were NOT taken at the same time. For DCS, data was taken continuously (8 data points per minute) for 5 minutes at each head of bed angle adjustment. The head of bed 0° to 12° elevation was repeated 3 times, making the total study time 35 minutes. By comparison, for TCD only 3 data points were taken at each HOB angle before the bed was repositioned, and the HOB angle was only elevated twice.