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(a) A schematic of the handheld PACT probe. US: ultrasound array transducer, P: deflecting prism, DOE: diffractive optical elements, DS: diode stack, MCL: micro-cylindrical lenses, CR: Aluminum cooling rim. Photoacoustic/ultrasound images of a human proximal interphalangeal joint in (b) sagittal and (c) transverse planes. Reproduced with permission from Ref. [58].
