Journal article
2-D Tissue Motion Compensation of Synthetic Transmit Aperture Images
Synthetic transmit aperture (STA) imaging is susceptible to tissue motion because it uses summation of low-resolution images to create the displayed high-resolution image. A method for 2-D tissue motion correction in STA imaging is presented. It utilizes the correlation between highresolution images recorded using the same emission sequence.
The velocity and direction of the motion are found by crosscorrelating short high-resolution lines beamformed along selected angles. The motion acquisition is interleaved with the regular B-mode emissions in STA imaging, and the motion compensation is performed by tracking each pixel in the reconstructed image using the estimated velocity and direction.
The method is evaluated using simulations, and phantom and in vivo experiments. In phantoms, a tissue velocity of 15 cm/s at a 45° angle was estimated with relative bias and standard deviation of −6.9% and 5.4%; the direction was estimated with relative bias and standard deviation of −8.4% and 6.6%.
The contrast resolution in the corrected image was −0.65% lower than the reference image. Abdominal in vivo experiments with induced transducer motion demonstrate that severe tissue motion can be compensated for, and that doing so yields a significant increase in image quality.
Language: | English |
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Publisher: | IEEE |
Year: | 2014 |
Pages: | 594-610 |
ISSN: | 15258955 and 08853010 |
Types: | Journal article |
DOI: | 10.1109/TUFFC.2014.2948 |
ORCIDs: | Jensen, Jørgen Arendt |
2D tissue motion compensation 2D tissue motion correction Apertures Correlation Image resolution Imaging In vivo Radar imaging Ultrasonic imaging biological tissues biomedical transducers contrast resolution corrected image cross-correlating short high-resolution lines beamforming emission sequence estimated direction estimated velocity high-resolution image recording image quality image reconstruction image resolution induced transducer motion low-resolution images medical image processing motion acquisition motion compensation motion direction motion velocity phantom phantoms reference image regular B-mode emissions selected angles synthetic transmit aperture images tissue motion ultrasonic imaging ultrasonic transducers