G - Physics – 03 – B
Patent
G - Physics
03
B
349/36
G03B 42/06 (2006.01) A61B 8/14 (2006.01)
Patent
CA 2005163
ABSTRACT OF THE DISCLOSURE A reflex transmission ultrasonic imaging system and method are shown which include a transducer (10) for pulse insonification (14) of an object (12) and for receiving echo signals from within the object. Echo signals are converted to electrical signals at the transducer (10) and the electrical signals are supplied to a signal processor (38) through a switching matrix (20), delays (22), and transmit-receive switches (18). The signal processor includes a detector (46) and integrator (48) for integrating the detector output. Echo signals obtained from a range zone (BZ) opposite a focal point (F) are processed by processor (38) and supplied to hold circuit (60) to provide an image pixel signal value. A compensation pixel signal value for hold circuit (64) is obtained by repeating the transmitting-receiving operation using a beam which is unfocused at any point along the beam axis between the transducer (10) and backscatter zone (BZ). The image and compensation pixel signals from hold circuits (60) and (64) are combined at combiner (68) to provide for a compensated image pixel signal output from the combiner. Artifacts which otherwise would result from non-uniform reflective properties of the backscatter zone (BZ) are removed by this process. Compensated image pixel signals are displayed at display (72).
Green Philip S.
Gowling Lafleur Henderson Llp
Sri International
LandOfFree
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