Table 2.

Comparing the efficiency of the ad hoc ECG filter and a moving average filter. Blood flow fluctuations were filtered out using an ad hoc filter based on simultaneously recorded ECG waveforms. For comparison, these fluctuations were also filtered using a moving averae filter. The ad hoc ECG filter was found to perform better in filtering the fluctuations.

	Parenchyma %	Vessel %
Unfiltered data	12.3	$13\phantom{0.}$
Moving average filter (width = 0.05 s)	10.8	12.1
Ad-hoc ECG filter	$\phantom{0}4.9$	$\phantom{0}5.1$
ECG filter and moving average filter	$\phantom{0}2.5$	$\phantom{0}3.2$
(width = 0.05 s)
Moving average filter	$\phantom{0}2.3$	$\phantom{0}3.8$
(width = 0.5 s)