Laser speckle contrast imaging based on spatial frequency domain filtering.
Fourier transform
fluctuation modulation
laser speckle contrast image
spatial frequency domain filtering
Journal
Journal of biophotonics
ISSN: 1864-0648
Titre abrégé: J Biophotonics
Pays: Germany
ID NLM: 101318567
Informations de publication
Date de publication:
09 2023
09 2023
Historique:
revised:
08
05
2023
received:
02
04
2023
accepted:
26
05
2023
medline:
5
9
2023
pubmed:
1
6
2023
entrez:
1
6
2023
Statut:
ppublish
Résumé
We proposed a novel method to separate static and dynamic speckles based on spatial frequency domain filtering. First, the raw speckle image sequence is processed frame by frame through 2D Fourier transform, low-pass and high-pass filtering in the spatial frequency domain, and inverse Fourier transform. Then, we can obtain low- and high-frequency image sequences in the spatial domain. Second, we averaged both sequences in the time domain. After the above processing, we obtain the mean intensities of the dynamic and static speckle components in the spatial domain. Finally, we calculated the time-averaged modulation depth to map the 2-D blood flow distribution. Both phantom and vivo experiments demonstrated that the proposed method could effectively suppress the background non-uniformity and has the advantage of high computational efficiency. It also can effectively improve image contrast, contrast-to-noise ratio, and imaging dynamic range.
Identifiants
pubmed: 37260409
doi: 10.1002/jbio.202300108
doi:
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
e202300108Informations de copyright
© 2023 Wiley-VCH GmbH.
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