Title :
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
fDate :
7/1/1988 12:00:00 AM
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;
Journal_Title :
Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on
