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A two-dimensional amplitude-steered ...

Frazier, Catherine Ann Hillsley.

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A two-dimensional amplitude-steered array for real-time volumetric acoustic imaging.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	A two-dimensional amplitude-steered array for real-time volumetric acoustic imaging./
Author:	Frazier, Catherine Ann Hillsley.
Description:	175 p.
Notes:	Adviser: William D. O'Brien, Jr.
Contained By:	Dissertation Abstracts International61-05B.
Subject:	Engineering, Electronics and Electrical. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9971076
ISBN:	0599762160

A two-dimensional amplitude-steered array for real-time volumetric acoustic imaging.
Frazier, Catherine Ann Hillsley.

A two-dimensional amplitude-steered array for real-time volumetric acoustic imaging. - 175 p.

Adviser: William D. O'Brien, Jr.

Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2000.

Real-time volumetric ultrasound imaging is difficult due to problems with array construction and due to the slow speed of data collection. In 1976, a linear amplitude-steered array was introduced that uses reduced electronics to steer a monofrequency beam. The current study examines how the linear amplitude-steered array can be extended to a two-dimensional array operating over a broad range of frequencies to be used for a real-time volumetric imaging system. First, the properties of the linear amplitude-steered array are studied, showing that there is a tradeoff between axial and lateral resolution, unique to this array, that depends on the length of the array. Second, various time-frequency distributions are surveyed for use in creating an image from a single received signal. Next, the concepts of imaging with a linear array are extended to imaging a volume with a two-dimensional amplitude-steered array. The array design is presented, and it is shown that targets can be localized by using the frequency separation of the amplitude-steered array in the vertical direction and conventional phased array beamsteering in the horizontal direction. Several methods for displaying the data are presented, with projection images offering computational savings. Nonlinear propagation is also discussed, demonstrating that although frequency of the received signal is equated with position, nonlinear generation of harmonics does not cause the appearance of false targets in the images. Experimental data are compared with simulations to validate the simulations of the array operation.

ISBN: 0599762160Subjects--Topical Terms:

626636
Engineering, Electronics and Electrical.

A two-dimensional amplitude-steered array for real-time volumetric acoustic imaging.
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020 $a 0599762160
035 $a (UnM)AAI9971076
035 $a AAI9971076
040 $a UnM $c UnM
100 1 $a Frazier, Catherine Ann Hillsley. $3 1254877
245 1 0 $a A two-dimensional amplitude-steered array for real-time volumetric acoustic imaging.
300 $a 175 p.
500 $a Adviser: William D. O'Brien, Jr.
500 $a Source: Dissertation Abstracts International, Volume: 61-05, Section: B, page: 2574.
502 $a Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2000.
520 $a Real-time volumetric ultrasound imaging is difficult due to problems with array construction and due to the slow speed of data collection. In 1976, a linear amplitude-steered array was introduced that uses reduced electronics to steer a monofrequency beam. The current study examines how the linear amplitude-steered array can be extended to a two-dimensional array operating over a broad range of frequencies to be used for a real-time volumetric imaging system. First, the properties of the linear amplitude-steered array are studied, showing that there is a tradeoff between axial and lateral resolution, unique to this array, that depends on the length of the array. Second, various time-frequency distributions are surveyed for use in creating an image from a single received signal. Next, the concepts of imaging with a linear array are extended to imaging a volume with a two-dimensional amplitude-steered array. The array design is presented, and it is shown that targets can be localized by using the frequency separation of the amplitude-steered array in the vertical direction and conventional phased array beamsteering in the horizontal direction. Several methods for displaying the data are presented, with projection images offering computational savings. Nonlinear propagation is also discussed, demonstrating that although frequency of the received signal is equated with position, nonlinear generation of harmonics does not cause the appearance of false targets in the images. Experimental data are compared with simulations to validate the simulations of the array operation.
590 $a School code: 0090.
650 4 $a Engineering, Electronics and Electrical. $3 626636
650 4 $a Physics, Acoustics. $3 1019086
690 $a 0544
690 $a 0986
710 2 0 $a University of Illinois at Urbana-Champaign. $3 626646
773 0 $t Dissertation Abstracts International $g 61-05B.
790 $a 0090
790 1 0 $a O'Brien, William D., Jr., $e advisor
791 $a Ph.D.
792 $a 2000
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9971076