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Generalized spatial coherence reconstruction for photoacoustic computed tomography
- Source :
- Journal of Biomedical Optics
- Publication Year :
- 2021
- Publisher :
- SPIE-Intl Soc Optical Eng, 2021.
-
Abstract
- Significance: Coherence, a fundamental property of waves and fields, plays a key role in photoacoustic image reconstruction. Previously, techniques such as short-lag spatial coherence (SLSC) and filtered delay, multiply, and sum (FDMAS) have utilized spatial coherence to improve the reconstructed resolution and contrast with respect to delay-and-sum (DAS). While SLSC uses spatial coherence directly as the imaging contrast, FDMAS employs spatial coherence implicitly. Despite being more robust against noise, both techniques have their own drawbacks: SLSC does not preserve a relative signal magnitude, and FDMAS shows a reduced contrast-to-noise ratio. Aim: To overcome these limitations, our aim is to develop a beamforming algorithm—generalized spatial coherence (GSC)—that unifies SLSC and FDMAS into a single equation and outperforms both beamformers. Approach: We demonstrated the application of GSC in photoacoustic computed tomography (PACT) through simulation and experiments and compared it to previous beamformers: DAS, FDMAS, and SLSC. Results: GSC outperforms the imaging metrics of previous state-of-the-art coherence-based beamformers in both simulation and experiments. Conclusions: GSC is an innovative reconstruction algorithm for PACT, which combines the strengths of FDMAS and SLSC expanding PACT’s applications.
- Subjects :
- Paper
Beamforming
Computer science
Biomedical Engineering
Iterative reconstruction
photoacoustic tomography
01 natural sciences
Signal
Imaging
010309 optics
Biomaterials
Signal-to-noise ratio
0103 physical sciences
Image Processing, Computer-Assisted
Computer Simulation
Image resolution
Ultrasonography
Phantoms, Imaging
Noise (signal processing)
Reconstruction algorithm
Coherence (statistics)
Atomic and Molecular Physics, and Optics
Electronic, Optical and Magnetic Materials
spatial coherence
beamformer
Tomography, X-Ray Computed
Algorithm
Algorithms
Subjects
Details
- ISSN :
- 10833668
- Volume :
- 26
- Database :
- OpenAIRE
- Journal :
- Journal of Biomedical Optics
- Accession number :
- edsair.doi.dedup.....cab4e1743f215f517f98c02e4ea53bb2