Fresnel focussed imaging system

Details Fresnel focussed imaging system Fresnel focussed imaging system

G - Physics

01

N

349/36

G01N 29/00 (2006.01) A61B 8/08 (2006.01) G01N 29/26 (2006.01) G01S 15/89 (2006.01) G10K 11/34 (2006.01)

Patent

CA 1116742

Abstract of the Disclosure An imaging system, particularly useful for acoustic medical diagonsis of a human subject, utilizes an array of radiating elements or sonic transducers located side-by-side and positioned along the subject. Signals received by the transducer are applied to a pair of pattern generation circuits which weight the in- dividual signals by factors of +1, -1 or 0. Graphs of the weighting factors as a function of transducer location have the likeness of cosinusoidal and sinusoidal Fresnel patterns, these patterns being produced by the two circuits. The weighted signals of each pattern are summed together, multiplied by cosinusodial and sinusoidal reference signals and then summed together to provide a radiation pattern which converges from the array to a focal point in front of the array while eliminating a diverging pattern from a virtual focus behind the array.

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