A piece-wise spatial invariant model of ultrasonic image formation

Author

IracÀ, Domenico ; Landini, Luigi ; Verrazzani, Lucio

Author_Institution

Inst. of Electron. & Telecommun., Pisa Univ., Italy

Volume

35

Issue

4

fYear

1988

fDate

7/1/1988 12:00:00 AM

Firstpage

457

Lastpage

463

Abstract

A model of ultrasonic image formation has been developed for an electronically focused linear-array transducer. An analytical expression for the point-spread function of the image degradation process is obtained. It consists of two terms: one accounts for the electromechanical properties of the transducer; the other describes the diffraction phenomena associated with the wave propagation. To reduce the computational complexity in image restoration, a piecewise-invariant form for the point-spread function has been suggested. Experimental results prove the validity of the model and the feasibility of the reconstruction process with a few shift-invariant filters.<>

Keywords

acoustic imaging; ultrasonic transducers; computational complexity; diffraction; electromechanical properties; electronically focused linear-array transducer; image degradation; image restoration; piece-wise spatial invariant model; point-spread function; ultrasonic image formation; wave propagation; Diffraction; Filters; Focusing; Geometry; Image analysis; Image restoration; Spatial resolution; Ultrasonic imaging; Ultrasonic transducer arrays; Ultrasonic transducers;

fLanguage

English

Journal_Title

Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on

Publisher

ieee

ISSN

0885-3010

Type

jour

DOI

10.1109/58.4182

Filename

4182