This study examines the performance of an all-optical and disposable photoacoustic needle probe for characterizing the aggressiveness of prostate cancer in human samples ex vivo. The needle probe consists of a 800um diameter fiber diffuser and a 200um diameter fiber optics hydrophone. The signals acquired by the needle probes were quantified by photoacoustic spectral analysis and envelop statistic methods. Both methods have differentiated between normal tissues and cancerous tissues (n=30 p<0.005), as well as between indolent and aggressiveness cancer tissues (n=16, p<0.01) with statistical significance.
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