Adaptive photoacoustic imaging using the Mallart-Fink focusing factor

Meng-Lin Li

doi:10.1117/12.764317

28 February 2008 Adaptive photoacoustic imaging using the Mallart-Fink focusing factor

Meng-Lin Li

Proceedings Volume 6856, Photons Plus Ultrasound: Imaging and Sensing 2008: The Ninth Conference on Biomedical Thermoacoustics, Optoacoustics, and Acousto-optics; 685627 (2008) https://doi.org/10.1117/12.764317
Event: SPIE BiOS, 2008, San Jose, California, United States

Abstract

Focusing errors caused by sound velocity heterogeneities widen the mainlobe and elevate the sidelobes, thus degrading both spatial and contrast resolutions in photoacoustic imaging. We propose an adaptive array-based photoacoustic imaging technique that uses the Mallart-Fink (MF) focusing factor weighting to reduce the effect of such focusing errors. The definition of the MF focusing factor indicates that the MF focusing factor at the main lobe of the point-spread function is high (close to 1, without speckle noise being present, which is the case in photoacoustic imaging), whereas it is low at the sidelobes. Based on this property, the elevated sidelobes caused by sound velocity heterogeneities in the tissue can be suppressed after being multiplied by the corresponding map of the MF focusing factor on each imaging point; thus the focusing quality can be improved. This technique makes no assumption of sources of focusing errors and directly suppresses the unwanted sidelobe contributions. Numerical experiments with near field phase screen and displaced phase screen models were performed here to verify the proposed adaptive weighting technique. The effect of the signal-to-noise ratio on the MF focusing factor is also discussed.

Citation Download Citation

Meng-Lin Li "Adaptive photoacoustic imaging using the Mallart-Fink focusing factor", Proc. SPIE 6856, Photons Plus Ultrasound: Imaging and Sensing 2008: The Ninth Conference on Biomedical Thermoacoustics, Optoacoustics, and Acousto-optics, 685627 (28 February 2008); https://doi.org/10.1117/12.764317

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KEYWORDS

Photoacoustic imaging

Signal to noise ratio

Near field

Photoacoustic spectroscopy

Tissues

Breast

Tissue optics

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