Circular-array ultrasound holography imaging using the linear-array approach

A circular-array, pulse-echo, ultrasound holography imaging method is presented. The configuration of the measurement system is much simpler than that of traditional computed-tomography (CT) and compound beta -scan imaging. Wide-beam insonification is used. The geometrical differences of the circula...

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Bibliographic Details
Published inIEEE transactions on ultrasonics, ferroelectrics, and frequency control Vol. 36; no. 5; pp. 485 - 493
Main Authors Qin, Z.D., Ylitalo, J., Oksman, J.
Format Journal Article
LanguageEnglish
Published United States IEEE 01.09.1989
Subjects
Acoustic beams
Acoustic distortion
Focusing
Frequency domain analysis
Geometry
Holography
Image reconstruction
Image resolution
Signal resolution
Ultrasonic imaging
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Summary:A circular-array, pulse-echo, ultrasound holography imaging method is presented. The configuration of the measurement system is much simpler than that of traditional computed-tomography (CT) and compound beta -scan imaging. Wide-beam insonification is used. The geometrical differences of the circular array compared with a linear array system are corrected in the frequency domain of the hologram. The computation time of the reconstruction process for a circular image is practically the same as that of a linear array imaging process using the backward propagation (BP) principle. A fast Fourier transform (FFT) algorithm is directly used in the reconstruction process. Computer simulation shows that the resolution of this imaging method can surpass that of a linear-array system. In the preliminary experiments, 2-mm resolution was achieved in both the lateral and radial directions with an ultrasound frequency of 2 MHz.< >
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ISSN:0885-3010
1525-8955
DOI:10.1109/58.31792