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An ultrasound frequency filter was designed and applied to each segmented PA signal in the frequency domain and inversely transformed into the time domain to correct for the differences in the fluence profiles at both wavelengths. Linear spectral unmixing was used to estimate sO2 before and after applying the ultrasound frequency filter. The estimated blood sO2 in the plastic tube for the porcine tissue experiment improved by 10.3% after applying the frequency filter when compared to the sO2 measured by a blood gas analyzer. For the in-
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