Scanning Reduction Strategy in MEG/EEG Beamformer Source Imaging

Table 1

Comparative total computing time (in seconds) of single trial analysis for different empirical data between conventional full-scan beamformer and reduced scanning beamformer with our proposed strategy. Source region with a total of 8,640 scanning points and a temporal window of 500 time samples were used. Experiments were conducted on a PC (Intel Core 2 Duo CPU 2.4 GHz, 32 bit OS, and 4 GB RAM).

Experiment (No. of trials)	Elapsed time of beamformer imaging (sec)		Improvement (%)
	Full-scan	Reduced scanning
Median-right (399)	723.3	418.8	42.1
Median-left (418)	760.6	430.2	43.4
Auditory-right (73)	132.1	74.7	43.5
Auditory-left (70)	126.9	72.1	43.2