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http://dx.doi.org/10.3807/KJOP.2019.30.2.048

Signal-to-noise Ratio in Time- and Frequency-domain Photoacoustic Measurements by Different Frequency Filtering  

Kang, DongYel (School of Basic Sciences, College of Engineering, Hanbat National University)
Publication Information
Korean Journal of Optics and Photonics / v.30, no.2, 2019 , pp. 48-58 More about this Journal
Abstract
We investigate the signal-to-noise ratios (SNRs) of time-domain (i.e. pulsed illumination) and frequency-domain (i.e. chirped illumination) photoacoustic signals measured by a spherically focused ultrasound transducer for spherical absorbers. The simulation results show that the time-domain photoacoustic SNR is higher than that of frequency-domain photoacoustic signals, as reported in the previous literature. We understand the reason for this SNR gap between the two measurement modes by analyzing photoacoustic-signal spectra, considering the incident beam energy controlled by the maximum permissible exposure. As the result of this approach, we find that filtering off the DC term in the chirped signal's spectrum improves frequency-domain photoacoustic SNRs by up to approximately 5 dB. In particular, it is observed that photoacoustic SNRs are highly sensitive to an upper-frequency value of frequency filtering functions, and the optimal upper-frequency values maximizing the SNR are different in time- and frequency-domain photoacoustic measurements.
Keywords
Computational optics; Medical optics; Photoacoustic imaging;
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