期刊
SENSORS
卷 21, 期 14, 页码 -出版社
MDPI
DOI: 10.3390/s21144888
关键词
sensing; photoacoustics; LED; unmixing
资金
- H2020 Laserlab Europe [EC-GA 871124]
- H2020 FETOPEN project Dynamic [EC-GA-863203]
- NSRF 2014-2020 BIOIMAGING-GR [MIS 5002755]
- HELLAS CH [MIS 5002735]
- INNOVAPROTECT - Operational Programme Competitiveness, Entrepreneurship and Innovation under the calls Reinforcement of the Research and Innovation Infrastructure [MIS 5030524]
- INNOVAPROTECT - Operational Programme Competitiveness, Entrepreneurship and Innovation under the RESEARCH-CREATE-INNOVATE [MIS 5030524]
- European Union (European Regional Development Fund)
The article describes a compact, cost-efficient, multiwavelength PA sensing system for quantitative measurements using high-power LED sources emitting at central wavelengths of 444 and 628 nm, and a single-element ultrasonic transducer at 3.5 MHz for signal detection. It explores the performance of LEDs in pulsed mode and the dependence of PA responses on absorber's concentration and applied energy fluence in tissue-mimicking phantoms. The developed system is capable of accurate estimations with absolute deviations ranging between 0.4 and 12.3%, demonstrating potential for in-vivo multiparametric measurements of important biomarkers.
The unique ability of photoacoustic (PA) sensing to provide optical absorption information of biomolecules deep inside turbid tissues with high sensitivity has recently enabled the development of various novel diagnostic systems for biomedical applications. In many cases, PA setups can be bulky, complex, and costly, as they typically require the integration of expensive Q-switched nanosecond lasers, and also presents limited wavelength availability. This article presents a compact, cost-efficient, multiwavelength PA sensing system for quantitative measurements, by utilizing two high-power LED sources emitting at central wavelengths of 444 and 628 nm, respectively, and a single-element ultrasonic transducer at 3.5 MHz for signal detection. We investigate the performance of LEDs in pulsed mode and explore the dependence of PA responses on absorber's concentration and applied energy fluence using tissue-mimicking phantoms demonstrating both optical absorption and scattering properties. Finally, we apply the developed system on the spectral unmixing of two absorbers contained at various relative concentrations in the phantoms, to provide accurate estimations with absolute deviations ranging between 0.4 and 12.3%. An upgraded version of the PA system may provide valuable in-vivo multiparametric measurements of important biomarkers, such as hemoglobin oxygenation, melanin concentration, local lipid content, and glucose levels.
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