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1. (WO1994001786) METHODS AND APPARATUS FOR THE EXAMINATION OF INTERNAL ORGANS

Pub. No.:    WO/1994/001786    International Application No.:    PCT/GB1993/001279
Publication Date: Jan 20, 1994 International Filing Date: Jun 16, 1993
IPC: G01S 7/52
G01S 15/89
Applicants: INTRAVASCULAR RESEARCH LIMITED
RYAN, Patrick, Joseph
BARLOW, Christopher, John
DICKINSON, Robert, Julian
Inventors: RYAN, Patrick, Joseph
BARLOW, Christopher, John
DICKINSON, Robert, Julian
Title: METHODS AND APPARATUS FOR THE EXAMINATION OF INTERNAL ORGANS
Abstract:
Ultrasonic apparatus for visualising the internal organs of the human body using an ultrasonic array probe is characterized by means for digitising the ultrasonic echo signals and means for processing the digitised signals. Data may be sampled from each array element excited separately, or on a group of elements sequentially with a very small time increment between samples. A step (11) for early data processing can include switching the transmit carrier frequency between scans, and compensation for ringing effects in the transducers. A step (12) provides synthetic aperture focusing technique. Step (13) comprises Software Envelope or Transform demodulation, attenuation or time gain correction and data compression.