Correlation-based correction of sound velocity inhomogeneities using delta-sigma modulators
Journal
Ultrasonic Imaging
Journal Volume
22
Journal Issue
4
Pages
206-213
Date Issued
2000
Author(s)
Abstract
Adaptive imaging; Phase aberration correction; Sound velocity inhomogeneities; Ultrasonic imaging; ΔΣmodulators
Subjects
Delta-sigma (ΔΣ) modulator based beam formers have been proposed for high-quality ultrasonic imaging. Due to the high sampling rate and single bit data width, the cost and complexity of the receive beamformer can be significantly reduced. It was shown that with proper dynamic focusing controls, equivalent image quality could be achieved with an adequate signal-to-quantization noise ratio (SQNR). In this paper, ΔΣ modulator based beamformers are used for correlation-based phase aberrations correction of sound velocity inhomogeneities in the body. It is shown that the correction can be efficiently implemented at a performance level similar to that of a conventional radio frequency (rf) beamformer. In addition, more than 6 dB contrast improvement is demonstrated. The different dynamic focusing techniques are also investigated in the context of phase aberration correction. It is shown that the single bit dynamic focusing approach does not affect the overall performance of phase aberration correction.
Adaptive imaging; Phase aberration correction; Sound velocity inhomogeneities; Ultrasonic imaging; ΔΣmodulators
SDGs
Other Subjects
Acoustic wave velocity; Beamforming; Delta sigma modulation; Focusing; Imaging systems; Modulators; Quantization (signal); Ultrasonic imaging; Adaptive imaging; Contrast improvements; Delta sigma modulator; High sampling rates; Inhomogeneities; Phase aberration correction; Receive beamformer; Signal to quantization noise ratios; Aberrations; article; dynamics; imaging system; mathematical analysis; phantom; signal noise ratio; sound; ultrasound; velocity
Type
journal article