Mr. Danhua Zhao Profile

Danhua Zhao

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Proceedings Article | 1 July 1990 Paper

Quality factors for phase-aberration correction in medical ultrasound

Gregg Trahey, Danhua Zhao

Proceedings Volume 1231, (1990) https://doi.org/10.1117/12.18782

KEYWORDS: Image quality, Ultrasonography, Image acquisition, Medical imaging, Imaging systems, Phased arrays, Acoustics, Diagnostics, Scanners, Tissues

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Spatial inhomogeneities in the acoustic velocity of tissues degrade the contrast and resolution of diagnostic ultrasonic images. A system which iteratively adjusts the phases of signals transmitted and received from individual elements in a phased array scanner in order to restore image quality when imaging through inhomogeneous layers is described. The adjustments are selected to maximize a quality factor in an operator-selectable region-of-interest. The use of several quality factors in improving image quality, including the average local and the peak echo magnitude of diffuse and point-like targets and integral powers of these magnitudes were investigated. Theory and experimental results related to these investigations is presented.

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