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4475395 Method for recognizing different frequency dependent scatter mechanisms in non homogeneous tissues
Ultrasound in Med. & Biel. Vol. 11, pp. Printed in the U .S.A. Al1 rights reserved. Copyright (c) Pergamon Press Ltd.
397-398,
1985
NEW PATENTS This Section contains abstracts and, where appropriate, illustrations of recently- issued United States patents and published patent applications filed from over 30 countries under the Patent Cooperation Treaty. This information was obtained from recent additions to the Pergamon PATSEARCHg online database in accordance with interest profiles developed by the Editors. Further information about Pergamon PATSEARCH” can be obtained from Pergamon InfoLine Inc., 1340 Old Chain Bridge Road, McLean, Virginia 22101 U.S.A.
Copies of complete patents announced in this Section are available from Pergamon InfoLine Inc. for $8 per copy. Payment with order is required. Orders outside North America add $2 for air postage. Order by patent number fo; Pergamon
InfoLine
önly.
4475376
tion. An ultrasonic signal is directed into the tissue and a reflected signal is detected. The frequency of the reflected signal is measured, and frequency dependent scatter perturbations are identified and eliminated from the measured frequency. Tissue attenuation is then established from the measured frequency after perturbations are eliminated.
APPARATUS FOR TESTING ULTRASONIC TRANSDUCERS George W Keilman nology
Laboratories
assigned Inc
to Advanced
A probe for testing ultrasound described. The probe is made
Tech-
transducers
is
of a body of material which absorbs ultrasound. There is a conical opening in the body, and a spherical transducer is mounted in the wider opening at the base of the conical opening. When the probe is used as a surface probe, a transducer undergoing tests is placed at the opening at the apex of the tone. Typically the conical opening is filled with a fluid which simulates the absorption qualities of the material with which the tested transducer wil1 ultimately be used. For example, the transducer undergoing the test wil1 be used with human body tissue, so a fluid such as water or Iight mineral oil would typically fill the coneshaped opening. The present invention can also be used as a hydrophone, because of the manner in which it generates, or senses, pressure waves at a point in space.
4475396 METHOD OF DETERMINING ULTRASONIC ATTENUATION OF TISSUE USING REFLECTIVE TOMOGRAPHIC RECONSTRUCTION Stephen W Flax, Gary H Glover assigned to Genera1 Electric Company Ultrasonic wave attenuation is determined for a plurality of limited volumes of tissue comprising a body under examination by directing ultrasonic waves through each limited volume along a plurality of vectors, determining a measure of attenuation of the limited volume by detecting the frequency shift of reflections of the ultrasonic wave along each vector, and averaging the attenuation of each limited volume from each vector intersecting the limited volume.
4475395 METHOD FOR RECOGNIZING DIFFERENT FREQUENCY DEPENDENTSCATTER MECHANISMS IN NONHOMOGENEOUS TISSUES
4475397 METHOD AND MEANS FOR ATTAINING ULTRASONIC ATTENUATION BY VECTOR SAMPLE AVERAGING
Stephen W Flax assigned to Genera1 Electric Company Time gain control of a variable gain amplifier in an ultrasonic scanning system is defined from ultrasonic attenuation of tissue under examina-
James K Riley, Stephen W Flax Genera1 Electric Company 397
assigned
to
397-398,
1985
NEW PATENTS This Section contains abstracts and, where appropriate, illustrations of recently- issued United States patents and published patent applications filed from over 30 countries under the Patent Cooperation Treaty. This information was obtained from recent additions to the Pergamon PATSEARCHg online database in accordance with interest profiles developed by the Editors. Further information about Pergamon PATSEARCH” can be obtained from Pergamon InfoLine Inc., 1340 Old Chain Bridge Road, McLean, Virginia 22101 U.S.A.
Copies of complete patents announced in this Section are available from Pergamon InfoLine Inc. for $8 per copy. Payment with order is required. Orders outside North America add $2 for air postage. Order by patent number fo; Pergamon
InfoLine
önly.
4475376
tion. An ultrasonic signal is directed into the tissue and a reflected signal is detected. The frequency of the reflected signal is measured, and frequency dependent scatter perturbations are identified and eliminated from the measured frequency. Tissue attenuation is then established from the measured frequency after perturbations are eliminated.
APPARATUS FOR TESTING ULTRASONIC TRANSDUCERS George W Keilman nology
Laboratories
assigned Inc
to Advanced
A probe for testing ultrasound described. The probe is made
Tech-
transducers
is
of a body of material which absorbs ultrasound. There is a conical opening in the body, and a spherical transducer is mounted in the wider opening at the base of the conical opening. When the probe is used as a surface probe, a transducer undergoing tests is placed at the opening at the apex of the tone. Typically the conical opening is filled with a fluid which simulates the absorption qualities of the material with which the tested transducer wil1 ultimately be used. For example, the transducer undergoing the test wil1 be used with human body tissue, so a fluid such as water or Iight mineral oil would typically fill the coneshaped opening. The present invention can also be used as a hydrophone, because of the manner in which it generates, or senses, pressure waves at a point in space.
4475396 METHOD OF DETERMINING ULTRASONIC ATTENUATION OF TISSUE USING REFLECTIVE TOMOGRAPHIC RECONSTRUCTION Stephen W Flax, Gary H Glover assigned to Genera1 Electric Company Ultrasonic wave attenuation is determined for a plurality of limited volumes of tissue comprising a body under examination by directing ultrasonic waves through each limited volume along a plurality of vectors, determining a measure of attenuation of the limited volume by detecting the frequency shift of reflections of the ultrasonic wave along each vector, and averaging the attenuation of each limited volume from each vector intersecting the limited volume.
4475395 METHOD FOR RECOGNIZING DIFFERENT FREQUENCY DEPENDENTSCATTER MECHANISMS IN NONHOMOGENEOUS TISSUES
4475397 METHOD AND MEANS FOR ATTAINING ULTRASONIC ATTENUATION BY VECTOR SAMPLE AVERAGING
Stephen W Flax assigned to Genera1 Electric Company Time gain control of a variable gain amplifier in an ultrasonic scanning system is defined from ultrasonic attenuation of tissue under examina-
James K Riley, Stephen W Flax Genera1 Electric Company 397
assigned
to