DocumentCode :
1313398
Title :
Ultrasound time-reversal MUSIC imaging with diffraction and attenuation compensation
Author :
Labyed, Y. ; Lianjie Huang
Author_Institution :
Los Alamos Nat. Lab., Los Alamos, NM, USA
Volume :
59
Issue :
10
fYear :
2012
fDate :
10/1/2012 12:00:00 AM
Abstract :
Time-reversal imaging with multiple signal classification (TR-MUSIC) is an algorithm for imaging point-like scatterers embedded in a homogeneous and non-attenuative medium. We generalize this algorithm to account for the attenuation in the medium and the diffraction effects caused by the finite size of the transducer elements. The generalized algorithm yields higher-resolution images than those obtained with the original TR-MUSIC algorithm. We evaluate the axial and lateral resolutions of the images obtained with the generalized algorithm when noise corrupts the recorded signals and show that the axial resolution is degraded more than the lateral resolution. The TR-MUSIC algorithm is valid only when the number of point-like targets in the imaging plane is fewer than the number of transducer elements used to interrogate the medium. We remedy this shortcoming by dividing the imaging plane into subregions and applying the TR-MUSIC algorithm to the windowed backscattered signals corresponding to each subregion. The images of all subregions are then combined to form the total image. Imaging results of numerical and phantom data show that when the number of scatterers within each subregion is much smaller than the number of transducer elements, the windowing method yields super-resolution images with accurate scatterer localization. We use computer simulations and tissue-mimicking phantom data acquired with a real-time synthetic-aperture ultrasound system to illustrate the algorithms presented in the paper.
Keywords :
biological tissues; biomedical ultrasonics; image classification; medical image processing; phantoms; ultrasonic imaging; TR-MUSIC algorithm; attenuation compensation; attenuation effect; axial resolution; diffraction compensation; diffraction effect; embedded point-like scatterer; generalized algorithm; homogeneous media; multiple signal classification; nonattenuative media; time-reversal imaging; tissue mimicking phantom data; transducer element; ultrasound time-reversal MUSIC imaging; Arrays; Finite element methods; Image resolution; Imaging; Signal resolution; Transducers; Ultrasonic imaging; Algorithms; Computer Simulation; Phantoms, Imaging; Ultrasonography;
fLanguage :
English
Journal_Title :
Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on
Publisher :
ieee
ISSN :
0885-3010
Type :
jour
DOI :
10.1109/TUFFC.2012.2445
Filename :
6327491
Link To Document :
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