A - Human Necessities – 61 – B
Patent
A - Human Necessities
61
B
333/3, 349/36, 3
A61B 10/00 (2006.01) A61B 8/00 (2006.01) G01C 21/26 (2006.01) G01S 15/89 (2006.01) G10K 11/34 (2006.01)
Patent
CA 1137211
ABSTRACT A variable delay system in which multistage delay lines are "shared" between different elements (e.g. different transducer elements or segments). A plurality of delay lines are provided, the delay lines having respectively different numbers of stages. The signals from the first and last segments of a segmented transducer are applied to opposing ends of the delay line having the largest number of stages. The signals from the second and next-to-last segments of the transducer are applied to opposing ends of the delay line having the next-to-largest number of stages, and so on. A plurality of coupling circuits are respectively associated with the plurality of delay lines and are opera- tive to sample, as a function of time, the signals at dif- ferent delay stages of their respective delay lines. The outputs of the coupling circuits are combined to form an image-representative signal. There is also provided, a selectable delay system for coupling between a plurality of elements and an input/output terminal t the relative delays between the input/output terminal and the individual elements being selectable under operator control. A single delay line is employed to obtain up to three different effective delay configurations that can be used, for example, to obtain three different focuses in an ultrasonic imaging system.
342835
Gowling Lafleur Henderson Llp
New York Institute Of Technology
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