Location-dependent Spatiotemporal Antialiasing in Photoacoustic Computed Tomography

Photoacoustic computed tomography (PACT) images optical absorption contrast by detecting ultrasonic waves induced by optical energy deposition in materials such as biological tissues. An ultrasonic transducer array or its scanning equivalent is used to detect ultrasonic waves. The spatial distributi...

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Bibliographic Details
Published in:IEEE transactions on medical imaging 2023-04, Vol.42 (4), p.1-1
Main Authors: Hu, Peng, Li, Lei, Wang, Lihong V.
Format: Article
Language:English
Subjects:
Algorithms
Aliasing
Arrays
Breast - diagnostic imaging
Computed tomography
Computer Simulation
Criteria
Female
Humans
Image contrast
Image processing
Image Processing, Computer-Assisted
Image reconstruction
Image resolution
location-dependent spatiotemporal antialiasing
Medical imaging
Phantoms, Imaging
Photoacoustic computed tomography
Photoacoustic Techniques - methods
Photoacoustic Techniques - standards
Reproducibility of Results
Spatial distribution
spatial Nyquist criterion
Spatio-Temporal Analysis
Tissues
Tomography, X-Ray Computed - instrumentation
Tomography, X-Ray Computed - methods
Tomography, X-Ray Computed - standards
Ultrasonic testing
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Summary:Photoacoustic computed tomography (PACT) images optical absorption contrast by detecting ultrasonic waves induced by optical energy deposition in materials such as biological tissues. An ultrasonic transducer array or its scanning equivalent is used to detect ultrasonic waves. The spatial distribution of the transducer elements must satisfy the spatial Nyquist criterion; otherwise, spatial aliasing occurs and causes artifacts in reconstructed images. The spatial Nyquist criterion poses different requirements on the transducer elements' distributions for different locations in the image domain, which has not been studied previously. In this research, we elaborate on the location dependency through spatiotemporal analysis and propose a location-dependent spatiotemporal antialiasing method. By applying this method to PACT in full-ring array geometry, we effectively mitigate aliasing artifacts with minimal effects on image resolution in both numerical simulations and in vivo experiments.
ISSN:0278-0062
1558-254X
DOI:10.1109/TMI.2022.3225565