期刊
PHOTOACOUSTICS
卷 23, 期 -, 页码 -出版社
ELSEVIER GMBH
DOI: 10.1016/j.pacs.2021.100277
关键词
Axial resolution; Frequency-domain photoacoustics; Pulsed laser photoacoustics; Truncated-correlation photoacoustic coherence tomography
类别
资金
- National Sciences and Engineering Research Council of Canada (NSERC) for an NSERC-CIHR CHRP grant
- Canada Research Chairs program
The report introduces a novel photoacoustic modality using pulsed chirp excitation and frequency-domain processing, as well as a method for enhancing axial resolution in photoacoustic images. Experimental results showed higher SNR and axial resolution in TC-PACT compared to conventional FD photoacoustics.
In this report we present a novel photoacoustic (PA) modality using pulsed chirp excitation at a fixed wavelength and spectral analysis based on frequency-domain (FD) processing. We introduce Truncated Correlation Photoacoustic Coherence Tomography (TC-PACT), a PA axial resolution enhancement methodology, with an application to closely stacked subsurface multilayers of plexiglass coated with a thin layer of graphite acting as surface absorber. The experimental results demonstrated that the SNR and the axial resolution were higher in TC-PACT than in conventional FD photoacoustics. A ns pulsed laser was also used as PA excitation source with axial resolution results found to be commensurate with TC-PACT. However, the separation distance between adjacent absorbers when the latter approached the axial resolution limit of the transducer was only resolved in TC-PACT compared to pulsed laser PA owing to the lower uncertainty in the former modality involved in determining the location of the absorbers.
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