Ultrasonic reflex transmission imaging method and apparatus with

Details Ultrasonic reflex transmission imaging method and apparatus with Ultrasonic reflex transmission imaging method and apparatus with

1988-07-18

1989-09-05

Jaworski, Francis

Surgery

Truss

Pad

73620, A61B 800

Patent

active

048628921

ABSTRACT:
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 other wise would result from non-uniform reflective properties of the beackscatter zone (BZ) are removed by this process. Compensated image pixel signals are displayed at display (72).

REFERENCES:
patent: 4442713 (1984-04-01), Wilson et al.
patent: 4470303 (1984-09-01), O'Donnell
patent: 4509524 (1985-04-01), Miwa
patent: 4519260 (1985-05-01), Fu et al.
patent: 4750366 (1988-06-01), Nicolas
patent: 4757715 (1988-07-01), Miwa et al.

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