Brett Byram
Last active: 4/3/2018

Synthetic aperture focusing for short-lag spatial coherence imaging.

Bottenus N, Byram BC, Dahl JJ, Trahey GE
IEEE Trans Ultrason Ferroelectr Freq Control. 2013 60 (9): 1816-26

PMID: 24658715 · PMCID: PMC3968796 · DOI:10.1109/TUFFC.2013.2768

It has been demonstrated that short-lag spatial coherence (SLSC) ultrasound imaging can provide improved speckle SNR and lesion CNR compared with conventional Bmode images, especially in the presence of noise and clutter. Application of the van Cittert-Zernike theorem predicts that coherence among the ultrasound echoes received across an array is reduced significantly away from the transmit focal depth, leading to a limited axial depth of field in SLSC images. Transmit focus throughout the field of view can be achieved using synthetic aperture methods to combine multiple transmit events into a single final image. A synthetic aperture can be formed with either focused or diverging transmit beams. We explore the application of these methods to form synthetically focused channel data to create SLSC images with an extended axial depth of field. An analytical expression of SLSC image brightness through depth is derived for the dynamic receive focus case. Experimental results in a phantom and in vivo are presented and compared with dynamic receive focused SLSC images, demonstrating improved SNR and CNR away from the transmit focus and an axial depth of field four to five times longer.

MeSH Terms (11)

Algorithms Humans Image Enhancement Image Interpretation, Computer-Assisted Male Middle Aged Phantoms, Imaging Reproducibility of Results Sensitivity and Specificity Thyroid Gland Ultrasonography

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