NDLI: Identification of pulse echo impulse responses for multisource transmission

Content Provider	IEEE Xplore Digital Library
Author	Gran, F. Jensen, J.A.
Copyright Year	2004
Description	Author affiliation: Center for Fast Ultrasound Imaging, Tech. Univ. Denmark, Lyngby, Denmark (Gran, F.; Jensen, J.A.)
Abstract	In this paper a method for acquiring data from several simultaneously transmitting elements in synthetic transmit aperture (STA) ultrasound imaging is proposed. Several transmitters are excited simultaneously using pseudo-random sequences. The received signal at a given time point and receiver is a mixture of the information corresponding to several transmitters. There is, thus, no direct way of determining which information corresponds to which transmitter, preventing proper focusing. In this paper we decode the received signal by estimating the pulse echo impulse responses between every transmitter and receiver pair, using a least squares estimator. The decoding is done instantaneously, making information from several transmitters available after only one transmission. This limits the influence of motion artifacts both in the decoding step and when the STA focusing scheme is applied. The method is evaluated using the simulation tool Field II. Three point spread functions are simulated where axial movement of 1 m/s is present. The axial resolution for the moving scatterer is 0.249 mm (-3dB) and 0.291 mm (-6dB), which is compared to a standard STA transmission scheme with sequential excitation of the transmitters using a chirp excitation. The axial resolution was in this case 0.260 mm (-3dB) and 0.611 mm (-6dB). Also a blood vessel is simulated with an angle of 45/spl deg/ to the acoustic axis with a peak flow of 1 m/s. The velocity is estimated with a mean bias of 2.57% and a mean standard deviation of 0.505% relative to the peak velocity of the flow.
Starting Page	168
Ending Page	172
File Size	632874
Page Count	5
File Format	PDF
ISBN	0780386221
DOI	10.1109/ACSSC.2004.1399113
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2004-11-07
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Transmitters Decoding Focusing Scattering Encoding Ultrasonic imaging Apertures Transducers Chirp Signal synthesis
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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