Research Article
Gradient Artefact Correction and Evaluation of the EEG Recorded Simultaneously with fMRI Data Using Optimised Moving-Average
Table 5
SNR and MSE for some EEG electrodes (GE 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 | 0.9990 | 0.9997 | 0.9998 | 0.9998 | 0.9998 | 0.9998 | F3 | 0.9974 | 0.9994 | 0.9996 | 0.9996 | 0.9997 | 0.9997 | Oz | 0.9980 | 0.9992 | 0.9993 | 0.9993 | 0.9993 | 0.9994 | CPz | 0.9968 | 0.9992 | 0.9994 | 0.9995 | 0.9996 | 0.9997 | Fz | 0.9977 | 0.9991 | 0.9991 | 0.9991 | 0.9990 | 0.9990 | FC5 | 0.9958 | 0.9989 | 0.9990 | 0.9990 | 0.9990 | 0.9989 | AF3 | 0.9990 | 0.9997 | 0.9998 | 0.9998 | 0.9998 | 0.9998 |
| SNR | AAS | Fp1 | 0.9960 | 0.9961 | 0.9962 | 0.9962 | 0.9962 | 0.9962 | F3 | 0.9977 | 0.9981 | 0.9982 | 0.9982 | 0.9982 | 0.9983 | Oz | 0.9861 | 0.9861 | 0.9861 | 0.9861 | 0.9861 | 0.9861 | CPz | 0.9949 | 0.9952 | 0.9953 | 0.9953 | 0.9953 | 0.9954 | Fz | 0.9953 | 0.9956 | 0.9956 | 0.9957 | 0.9957 | 0.9957 | FC5 | 0.9974 | 0.9979 | 0.9979 | 0.9980 | 0.9980 | 0.9981 | AF3 | 0.9969 | 0.9971 | 0.9971 | 0.9971 | 0.9971 | 0.9971 |
| MSE (µV2) | OMA | Fp1 | 8.1852 | 2.2973 | 1.9257 | 1.8225 | 1.7843 | 1.7917 | F3 | 3.1040 | 0.6376 | 0.4770 | 0.4207 | 0.3828 | 0.3740 | Oz | 2.5445 | 0.9858 | 0.8820 | 0.8359 | 0.7909 | 0.7727 | CPz | 0.7211 | 0.1624 | 0.1208 | 0.1007 | 0.0807 | 0.0726 | Fz | 0.6469 | 0.2537 | 0.2448 | 0.2493 | 0.2621 | 0.2703 | FC5 | 8.6758 | 2.2185 | 1.9761 | 1.9478 | 1.9942 | 2.0390 | AF3 | 2.3881 | 0.6828 | 0.5910 | 0.5671 | 0.5628 | 0.5685 |
| MSE (µV2) | AAS | Fp1 | 32.2881 | 30.8757 | 30.5258 | 30.3384 | 30.1333 | 30.0426 | F3 | 2.7148 | 2.1758 | 2.0877 | 2.0445 | 2.0002 | 1.9816 | Oz | 18.2050 | 17.7786 | 17.6364 | 17.5485 | 17.4401 | 17.3874 | CPz | 1.1722 | 1.0444 | 1.0174 | 1.0024 | 0.9855 | 0.9779 | Fz | 1.3609 | 1.2396 | 1.2154 | 1.2021 | 1.1870 | 1.1801 | FC5 | 5.4794 | 4.1711 | 3.9548 | 3.8491 | 3.7422 | 3.6981 | AF3 | 7.5164 | 7.1415 | 7.0543 | 7.0059 | 6.9510 | 6.9259 |
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