A photoacoustic imaging system detecting ultrasound generated by pulse-modulated mid-infrared light irradiation is proposed and developed. Based on the spectra obtained with this method, we used SVM to derive the optimal combination of two wavelengths for separating muscle and fat, and achieved imaging using this combination.
For non-invasive measurement of biological tissue, a piezoelectric photoacoustic spectroscopy system detecting ultrasound induced by irradiation of mid-infrared laser light was developed. In this work, a photoacoustic spectrum of poultry breast meat was obtained with this proposed method. Although photoacoustic spectra characterizing the optical absorption of the meat were obtained, the sensitivity was slightly less than conventional PAS. Therefore, an investigation to improve the measurement sensitivity was also performed by using standing waves in the sample. As a result, the sensitivity was successfully improved utilizing this effect, and obtained a human skin spectrum of fat and sugar absorption appeared.
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