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  Indian J Med Microbiol
 

Figure 4: Photoacoustic imaging system reconstructed into a plane with different wavelengths and ratio image. (a) Photoacoustic signal was effectively obtained from the site of melanin at 820 nm. It was difficult to compare the magnitude of the photoacoustic effect acquired at combinations between 690/850 and 820/940 nm because the distance between the probe and the sample may have changed. (b) The magnitude of the photoacoustic signal on photoacoustic imaging at 940 nm was weaker. (c) Ratio image showing the melanin site in blue. There was a significant difference in signal intensity obtained at different wavelengths

Figure 4: Photoacoustic imaging system reconstructed into a plane with different wavelengths and ratio image. (a) Photoacoustic signal was effectively obtained from the site of melanin at 820 nm. It was difficult to compare the magnitude of the photoacoustic effect acquired at combinations between 690/850 and 820/940 nm because the distance between the probe and the sample may have changed. (b) The magnitude of the photoacoustic signal on photoacoustic imaging at 940 nm was weaker. (c) Ratio image showing the melanin site in blue. There was a significant difference in signal intensity obtained at different wavelengths