Generalized Spatial Coherence Reconstruction for Photoacoustic Computed Tomography

Overview

Journal J Biomed Opt

Specialties Biomedical Engineering
Ophthalmology

Date 2021 Apr 21

PMID 33880892

Citations 2

Authors

Jorge Tordera Mora

Xiaohua Feng

Nikhila Nyayapathi

Jun Xia

Liang Gao

Affiliations

Soon will be listed here.

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.

Citing Articles

Enhancing image reconstruction in photoacoustic imaging using spatial coherence mean-to-standard-deviation factor beamforming.

Wang X, Wu D, Xie Y, Bi Y, Xu Y, Zhang J Biomed Opt Express. 2024; 15(12):6682-6696.

PMID: 39679409 PMC: 11640575. DOI: 10.1364/BOE.542710.

Image Quality Improvement Techniques and Assessment Adequacy in Clinical Optoacoustic Imaging: A Systematic Review.

Dimaridis I, Sridharan P, Ntziachristos V, Karlas A, Hadjileontiadis L Biosensors (Basel). 2022; 12(10).

PMID: 36291038 PMC: 9599915. DOI: 10.3390/bios12100901.

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