Surgery – Diagnostic testing – Detecting nuclear – electromagnetic – or ultrasonic radiation
Patent
1999-03-11
2000-09-19
Jaworski, Francis J.
Surgery
Diagnostic testing
Detecting nuclear, electromagnetic, or ultrasonic radiation
A61B 800
Patent
active
061204501
ABSTRACT:
Disclosed is a pulse-echo array imaging system which includes a conventional imaging mode and an aberration-measurement mode. When the system is switched to the aberration mode, several algorithms disclosed in the present invention are used to measure transmission and reception phase- and amplitude-aberration profiles. The measured transmission and reception aberration profiles are then used for aberration corrections for transmission and reception respectively in the conventional imaging mode. Disclosed are phase- and amplitude-aberration correction algorithms using near-field signal redundancy. It applies dynamic near-field correction on common-midpoint signals before the cross-correlation function between them is calculated. Also disclosed are phase- and amplitude-aberration measurement algorithms for measuring and correcting different transmission and reception aberration profiles. Further disclosed are phase- and amplitude-aberration correction algorithms using common-midpoint signals collected with sub-arrays to measure angle-dependent aberration profiles. Also disclosed are methods for implementing the phase- and amplitude-aberration correction algorithms disclosed in the present invention on a two-dimensional array. Further disclosed is a method for the simultaneous collection of common-midpoint signals to reduce the effect of tissue motion on the aberration-measurement accuracy. Other methods and algorithms for improving the measurement accuracy and reducing the measurement time are also disclosed.
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Commonwealth Scientific and Industrial Research Organisation
Jaworski Francis J.
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