Gradient Artefact Correction and Evaluation of the EEG Recorded Simultaneously with fMRI Data Using Optimised Moving-Average

Table 4

SNR and MSE for some EEG electrodes (Philips data), considering application of low-pass filtering in and .

Measure	Method	EEG electrode	Filter cut-off frequency
			No LP	150 Hz	120 Hz	100 Hz	70 Hz	50 Hz
SNR	OMA	Fp1	0.9999	1.0000	1.0000	1.0000	1.0000	1.0000
		F3	0.9998	0.9999	0.9999	0.9999	0.9999	0.9999
		Oz	0.9999	0.9999	0.9999	0.9999	0.9999	0.9999
		CPz	0.9997	0.9999	0.9999	0.9999	1.0000	1.0000
		Fz	0.9997	0.9999	1.0000	1.0000	1.0000	1.0000
		FC5	0.9992	0.9998	0.9998	0.9998	0.9998	0.9998
		AF3	0.9998	0.9999	0.9999	0.9999	0.9999	0.9999
SNR	AAS	Fp1	0.9993	0.9994	0.9995	0.9995	0.9995	0.9995
		F3	0.9988	0.9990	0.9991	0.9991	0.9991	0.9992
		Oz	0.9987	0.9989	0.9989	0.9989	0.9990	0.9990
		CPz	0.9977	0.9981	0.9982	0.9983	0.9984	0.9984
		Fz	0.9987	0.9990	0.9991	0.9991	0.9991	0.9992
		FC5	0.9975	0.9986	0.9988	0.9989	0.9990	0.9990
		AF3	0.9991	0.9992	0.9993	0.9993	0.9994	0.9994
MSE (µV^2)	OMA	Fp1	0.5078	0.2047	0.1686	0.1537	0.1407	0.1359
		F3	0.5841	0.3335	0.3123	0.3020	0.2913	0.2867
		Oz	0.4108	0.1962	0.1794	0.1734	0.1694	0.1685
		CPz	0.1355	0.0283	0.0225	0.0202	0.0184	0.0179
		Fz	0.1091	0.0183	0.0148	0.0132	0.0119	0.0114
		FC5	2.3462	0.7015	0.5607	0.5026	0.4500	0.4299
		AF3	0.3380	0.1484	0.1305	0.1230	0.1161	0.1135
MSE (µV^2)	AAS	Fp1	3.6086	2.8759	2.6540	2.5278	2.3824	2.3155
		F3	3.2115	2.6447	2.4861	2.3915	2.2782	2.2246
		Oz	3.7296	3.1849	2.9991	2.8894	2.7599	2.6993
		CPz	0.9186	0.7407	0.6878	0.6575	0.6225	0.6063
		Fz	0.4204	0.3190	0.2957	0.2826	0.2675	0.2606
		FC5	7.7577	4.0962	3.4639	3.1535	2.8346	2.7007
		AF3	1.9105	1.5336	1.4264	1.3652	1.2941	1.2611