DocumentCode :
1406280
Title :
A study of synthetic-aperture imaging with virtual source elements in B-mode ultrasound imaging systems
Author :
Bae, Moo-Ho ; Jeong, Mok-Kun
Author_Institution :
Medison Co., Seoul, South Korea
Volume :
47
Issue :
6
fYear :
2000
Firstpage :
1510
Lastpage :
1519
Abstract :
We propose an all point transmit and receive focusing method based on transmit synthetic focusing combined with receive dynamic focusing in a linear array transducer. In the method, on transmit, a virtual source element is assumed to be located at the transmit focal depth of conventional B-mode imaging systems, and transmit synthetic focusing is used in two half planes, one before and the other after the transmit focal depth, using the RF data of each scanline, together with all other relevant RF scanline data previously stored. The proposed new method uses the same data acquisition scheme as the conventional focusing method while maintaining the same frame rate via high-speed signal processing, but it is not suitable for imaging moving objects. It improves upon the lateral resolution and sidelobe level at all imaging depths. Also, it increases the transmit power and image signal-to-noise ratio (SNR), due to transmit field synthesis, and extends the image penetration depth as well. Evaluations with simulation and experimental data show much improvement in resolution and SNR at all imaging depths.
Keywords :
acoustic signal processing; biomedical ultrasonics; image resolution; medical image processing; ultrasonic focusing; B-mode ultrasound imaging systems; RF scanline data; all-point transmit-receive focusing; bidirectional pixel-based focusing; high-speed signal processing; image SNR; image penetration depth; lateral resolution; linear array transducer; receive dynamic focusing; sidelobe level; synthetic-aperture imaging; tissue equivalent phantoms; transmit field synthesis; transmit synthetic focusing; virtual source elements; Data acquisition; Focusing; High-resolution imaging; Image resolution; Radio frequency; Signal processing; Signal resolution; Signal to noise ratio; Ultrasonic imaging; Ultrasonic transducers;
fLanguage :
English
Journal_Title :
Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on
Publisher :
ieee
ISSN :
0885-3010
Type :
jour
DOI :
10.1109/58.883540
Filename :
883540
Link To Document :
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