Photoacoustic imaging generates ultrasound waves by irradiating biological tissues with pulses or modulated continuous lasers. Ultrasound sensors are used to capture ultrasound signals in a distributed manner. Then, the light absorption distribution of biological tissues can be reconstructed with the help of image reconstruction algorithms. Compared with optical imaging, photoacoustic imaging provides higher spatial resolution, greater penetration depth and selective optical absorption contrast, thereby enabling detailed visualization of the distribution of hemoglobin, lipid, melanin, and other chromophores in biological tissues.
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Source: Phys.org