Table 1:

Average and peak velocities at the zenith and nadir of a sinusoidal waveform measured in a phantom with the RPC and CPC acquisitions

	RPCa	CPCa	Absolute Difference
Average velocity at zenith (cm/s)	6.5 ± 0.1	6.4 ± 1.2	0.1
Average velocity at nadir (cm/s)	1.8 ± 0.7	2.0 ± 1.1	0.2
Peak velocity at zenith (cm/s)	11.5 ± 0.6	10.2 ± 0.9	1.3
Peak velocity at nadir (cm/s)	4.3 ± 0.4	5.0 ± 0.6	0.7
Average			0.6 ± 0.6

^a Mean values ± SDs.