The DOI matches its Crossref record; 18 of the 18 references it cites were found in a registry or an index.
Multi-wavelength photoplethysmography method for skin arterial pulse extraction
Open accessAbstract
In this work, we present a multi-wavelength (MW) PPG method exploiting the wavelength dependence of light penetration in skin tissue to provide depth resolution of skin blood pulsation. The MW PPG system requires two to three light sources in different wavelengths and extracts the arterial blood pulsation through a multi-wavelength multi-layer light-skin interaction model, which removes the capillary pulsation (determined from the short-wavelength PPG signal) from the long-wavelength PPG signal using absorption weighting factors that are quasi-analytically calibrated. The extracted pulsations are used to calculate blood pressure (BP) through pulse transit time (PTT), and the results are compared with those obtained from the single wavelength PPG method. The comparative study is clinically performed on 20 subjects including 10 patients diagnosed with cardiovascular diseases and 10 healthy subjects. The result demonstrates that the MW PPG method significantly improves the measurement accuracy of systolic BP (SBP), reducing the mean absolute difference between the reference and the estimated SBP values from 5.7 mmHg (for single-wavelength PPG) to 2.9 mmHg (for three-wavelength PPG).
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“For example, in a study by Liu et al., where instead of using a single wavelength PPG, three wavelengths were used, the accuracy was increased about two times [114].”
From The Current State of Optical Sensors in Medical Wearables (2022) · cites this paper as [114]
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Photoplethysmography and its application in clinical physiological measurement
Allen, J. (2007) · Physiological Measurement · doi:10.1088/0967-3334/28/3/r01 · Cited by 3,967
Estimation of optical pathlength through tissue from direct time of flight measurement
Delpy, D. T., Cope, M., van der Zee, P., Arridge, S., Wray, S., & Wyatt, J. S. (1988) · Physics in Medicine and Biology · doi:10.1088/0031-9155/33/12/008 · Cited by 2,251
The modified Beer–Lambert law revisited
Kocsis, L., Hermán, P., & Eke, A. (2006) · Physics in Medicine and Biology · doi:10.1088/0031-9155/51/5/n02 · Cited by 682
Okada, E., Firbank, M., Schweiger, M. J., Arridge, S., Cope, M., & Delpy, D. T. (1997) · Applied Optics · doi:10.1364/ao.36.000021 · Cited by 477
Chen, W., Kobayashi, T., Ichikawa, S., Takeuchi, Y., & Togawa, T. (2000) · Medical & Biological Engineering & Computing · doi:10.1007/bf02345755 · Cited by 425
Utility of the Photoplethysmogram in Circulatory Monitoring
Reisner, A. T., Shaltis, P., McCombie, D. B., Asada, H. H., Warner, D. S., & Warner, M. A. A. (2008) · Anesthesiology · doi:10.1097/aln.0b013e31816c89e1 · Cited by 365
Modified Beer-Lambert law for blood flow
Baker, W. B., Parthasarathy, A. B., Busch, D. R., Mesquita, R. C., Greenberg, J. H., & Yodh, A. G. (2014) · Biomedical Optics Express · doi:10.1364/boe.5.004053 · Cited by 285
Strangman, G. E., Li, Z., & Zhang, Q. (2013) · PLoS ONE · doi:10.1371/journal.pone.0066319 · Cited by 265
陳, 文. (2001) · Medical Entomology and Zoology · Cited by 115
Non-invasive physiological measurements
Escourrou, P. (1988) · Proceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society · doi:10.1109/iembs.1988.95111 · Cited by 102
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Affect Recognition in Deaf Children Using Physiological Signal Measurements
Choudhary, K., & Prajapati, G. L. (2026) · SN Computer Science · doi:10.1007/s42979-025-04711-w
Zheng, Y., Hu, Y., Zhou, R., Yu, L., Wang, H., Ye, X., & Zhou, C. (2025) · International Conference on Signal Processing Systems (ICSPS) · doi:10.1109/icsps66615.2025.11347986
The M-ArEye Database: A Multimodal Resource for Affect Recognition in Visually Impaired Children
Choudhary, K., & Prajapati, G. L. (2026) · IEEE International Conference on Interdisciplinary Approaches in Technology and Management for Social Innovation (IATMSI) · doi:10.1109/iatmsi68868.2026.11465269
Graph-based multimodal affect recognition in children using prototypical networks
Choudhary, K., & Prajapati, G. L. (2026) · Frontiers in Computer Science · doi:10.3389/fcomp.2026.1774796 · Cited by 1
Noninvasive Blood Glucose Monitoring with Machine Learning Enhanced Transmittance Spectroscopy
Paul, T. K., Nayem, S. S., Rakib, M. A., Islam, M. J., Kaysir, M. R., & Rassel, S. (2026) · ACS Omega · doi:10.1021/acsomega.5c11682
Wolling, F., Filipp, A., & Michahelles, F. (2026) · ACM International Symposium on Wearable Computers (ISWC) · doi:10.1145/3830727.3834825
Metadata
- Authors
- Liu, J., Yan, B. P.-Y., Dai, W.-X., Ding, X.-R., Zhang, Y.-T., & Zhao, N.
- Affiliations
- Chinese University of Hong Kong (HK)
- Venue
- Biomedical Optics Express
- Publisher
- Optica Publishing Group
- Published
- 2016-09-27
- Volume
- 7
- Issue
- 10
- Pages
- 4313
- ISSN
- 2156-7085 (ISSN-L)
- PMC
- PMC5102532
- OpenAlex
- W2526662839
- Cited by
- 107
- References
- 18
- Citations by year
- 2026: 7 · 2025: 12 · 2024: 12 · 2023: 17 · 2022: 17 · 2021: 10 · 2020: 12 · 2019: 10 · 2018: 9 · 2017: 1
- FWCI
- 3.21
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Locations
- Biomedical Optics Express (publishedVersion)
- PubMed Central (publishedVersion)
- PubMed (publishedVersion)
- Funders
- Chow Yuk Ho Technology Centre for Innovative Medicine (TIM Seed Grant)
- Innovation and Technology Commmission of Hong Kong (ITS/275/15FP)
- Topics
- Physical Sciences › Engineering › Biomedical Engineering › Non-Invasive Vital Sign Monitoring
- Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Cardiovascular Health and Disease Prevention
- Health Sciences › Medicine › Radiology, Nuclear Medicine and Imaging › Optical Imaging and Spectroscopy Techniques
- Keywords
- light penetration depth, pulse transit time, systolic blood pressure estimation, cardiovascular disease
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