fNIRS Signal Motion Correction Algorithm Based on Mathematical Morphology and Median Filter

Fig. 5. Waveform of simulation data after using tMedMor algorithm, the data in the figure was selected from OD signal with a wavelength of 830 nm in a certain channel. (a) OD signals contaminated by motion artifacts; (b) OD signal corrected by tMed algorithm; (c) OD signal corrected by Mor algorithm; (d) comparing OD signal corrected by tMedMor algorithm with OD signal without motion artifacts

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Fig. 6. Evaluation indices calculated after correcting motion artifacts of simulated block-average HbO signal with different algorithms. (a) E_MS; (b) R_SN; (c) R²; (d) E_p

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Fig. 7. Waveform of real data after using tMedMor algorithm, the data in the figure was selected from OD signal with a wavelength of 830 nm in a certain channel. (a) OD signals contaminated by motion artifacts; (b) OD signal corrected by tMed method; (c) OD signal corrected by Mor algorithm; (d) comparing OD signal corrected by tMedMor algorithm with OD signal without motion artifacts

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Fig. 8. Evaluation indices calculated after correcting motion artifacts of true block-average HbO signal with different algorithms. (a) E_MS; (b) R_SN; (c) R²; (d) E_p

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Table 1. E_MS, R_SN, R² and E_p of simulated block-average HbO signal after processing by different algorithms

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Table 1. E_MS, R_SN, R² and E_p of simulated block-average HbO signal after processing by different algorithms

Method	${E_{MS}}_{}$ /10^-15	${R_{SN}}_{}$ /dB	R²	E_p
Uncorrected	3561.7±3182.1	-24.57±3.81	0.53±0.42	29136.8±43210.4
MARA	498.5±666.6	-14.34±6.04	0.74±0.25	3933.7±4644.9
TDDR	38.4±24.4	-5.44±2.45	0.75±0.24	265.9±228.4
Spline-SG	125.3±110.1	-9.67±4.97	0.68±0.27	1468.9±2258.0
kWavelet	1704.5±1414.4	-19.97±6.40	0.49±0.29	17613.0±27820.8
tPCA	3611.4±3844.7	-24.24±3.89	0.57±0.36	27700.4±31193.8
Mor	26.5±34.3	-0.50±7.01	0.63±0.37	227.9±381.3
tMed	3618.8±3917.1	-23.95±4.22	0.40±0.36	28697.4±50120.2
tMedMor	6.9±4.9	3.18±5.25	0.74±0.26	60.5±78.0

Table 2. E_MS, R_SN, R² and E_p of real block-average HbO signal after processing by different algorithms

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Table 2. E_MS, R_SN, R² and E_p of real block-average HbO signal after processing by different algorithms

Method	${E_{MS}}_{}$ /10^-14	${R_{SN}}_{}$ /dB	R²	E_p
Uncorrected	3006.9±2588.0	-23.68±4.35	0.44±0.32	20714.2±19455.8
MARA	76.4±72.5	-6.01±7.19	0.77±0.20	603.6±640.7
TDDR	11.9±13.5	1.60±5.74	0.88±0.12	83.4±91.5
Spline-SG	23.6±30.4	-1.37±5.31	0.86±0.10	170.1±206.3
kWavelet	95.2±98.7	-7.44±6.12	0.50±0.33	566.7±622.3
tPCA	78.3±78.6	-6.66±6.05	0.74±0.19	613.8±777.0
Mor	1.7±1.5	8.21±3.43	0.83±0.17	8.2±14.9
tMed	2992.4±2580.1	-23.67±4.32	0.44±0.32	20270.2±19240.6
tMedMor	1.6±1.4	8.66±3.29	0.85±0.16	5.1±6.6

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Jie Zhao, Jirimutu Qiao, Xuetong Ding, Xiaomin Liang. fNIRS Signal Motion Correction Algorithm Based on Mathematical Morphology and Median Filter[J]. Acta Optica Sinica, 2020, 40(22): 2230002

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Paper Information

Category: Spectroscopy

Received: Jun. 5, 2020

Accepted: Jul. 31, 2020

Published Online: Oct. 25, 2020

The Author Email: Qiao Jirimutu (1315225734@qq.com)

DOI:10.3788/AOS202040.2230002

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. EMS, RSN, R2 and Ep of simulated block-average HbO signal after processing by different algorithms

Table 1. EMS, RSN, R2 and Ep of simulated block-average HbO signal after processing by different algorithms

Table 2. EMS, RSN, R2 and Ep of real block-average HbO signal after processing by different algorithms

Table 2. EMS, RSN, R2 and Ep of real block-average HbO signal after processing by different algorithms

Table 1. E_MS, R_SN, R² and E_p of simulated block-average HbO signal after processing by different algorithms

Table 1. E_MS, R_SN, R² and E_p of simulated block-average HbO signal after processing by different algorithms

Table 2. E_MS, R_SN, R² and E_p of real block-average HbO signal after processing by different algorithms

Table 2. E_MS, R_SN, R² and E_p of real block-average HbO signal after processing by different algorithms