title: A piece-wise spatial invariant model of ultrasonic image formation.
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.
authors.affiliation: Inst. of Electron. and Telecommun., Pisa Univ.
authors.forename: D
authors.initials: D
authors.lastname: Iraca
authors.forename: L
authors.initials: L
authors.lastname: Landini
authors.forename: L
authors.initials: L
authors.lastname: Verrazzani