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4870972 Multiple-frequency acoustic transducer, especially for medical imaging
1020
New Patents
4870972 MULTIPLE-FREQUENCY ACOUSTIC TRANSDUCER, ESPECIALLY FOR MEDICAL IMAGING Charles Maerfeld, Jean F Gelly, Antibes, France assigned to Thomson-CSF Disclosed is a probe for medical echography wherein, between the piezoelectric transducers and the backing, there is inserted a half-wave strip at the natural resonance frequency of these transducers, thus enabling the use of the probe in two distinct frequencies, one of which is substantially equal to half the other, and thus providing for ordinary mode B imaging and DFM Doppler imaging with one and the same probe.
4873869 DEVICE FOR THE SCANNING OF OBJECTS BY MEANS OF ULTRASOUND ECHOGRAPHY Mathias Fink, Meudon, France assigned to U S Philips Corporation; Fujitsu Limit An ultrasonic echography apparatus which comprises a first processing circuit (100) of a known type for the processing of the ultrasonic ethos in order to display an A-type echogram on a display device (103), and a second processing circuit (200) which is connected parallel to the first processing circuit and which consists mainly of an amplifier (210), a group of n parallel connected channels (220a . . , 220n) each of which comprises at least one band-pass filter (221a . .
221n) and one envelope detector (222a . . .222n), an arithmetic circuit (240) for calculating an indicator for the spread of the amplitudes of the signals of central frequency of each channel, and an evaluation circuit (250) which determines, again for display on the device (103), the value of the ultrasonic attenuation factor in the tissues examined, the evaluation being possible because of the fact that the calculated spread indicator is directly locally correlated to the attenuation factor which is the slope of the curve of the variation of the ultrasonic attenuation as a function of the frequency in the tissues examined.
4873984 TECHNIQUES FOR CALCULATING ULTRASONIC INTEGRATEDBACKSCATTER USING FREQUENCY OR TIME DOMAIN TECHNIQUES Thomas J Hunt, James G Miller, Lewis J Thomas, Hewlett E Melton, Thomas Shoup assigned to Hewlett-Packard Company Apparatus for deriving signals indicating a condition of tissue within an area by launching spaced supersonic pulses into a body under examination and detecting the power of supersonic waves scattered from locations along a plurality of known paths. Gain control elements are provided for compensating for changes in amplitude of the scattered supersonic waves resulting from their passage through blood or tissue, the increased attenuation with frequency of the spectrum of the launched pulses and the focussing of the launched pulses. Compensation for ring-down and the attenuation of the chest wall is also provided.
New Patents
4870972 MULTIPLE-FREQUENCY ACOUSTIC TRANSDUCER, ESPECIALLY FOR MEDICAL IMAGING Charles Maerfeld, Jean F Gelly, Antibes, France assigned to Thomson-CSF Disclosed is a probe for medical echography wherein, between the piezoelectric transducers and the backing, there is inserted a half-wave strip at the natural resonance frequency of these transducers, thus enabling the use of the probe in two distinct frequencies, one of which is substantially equal to half the other, and thus providing for ordinary mode B imaging and DFM Doppler imaging with one and the same probe.
4873869 DEVICE FOR THE SCANNING OF OBJECTS BY MEANS OF ULTRASOUND ECHOGRAPHY Mathias Fink, Meudon, France assigned to U S Philips Corporation; Fujitsu Limit An ultrasonic echography apparatus which comprises a first processing circuit (100) of a known type for the processing of the ultrasonic ethos in order to display an A-type echogram on a display device (103), and a second processing circuit (200) which is connected parallel to the first processing circuit and which consists mainly of an amplifier (210), a group of n parallel connected channels (220a . . , 220n) each of which comprises at least one band-pass filter (221a . .
221n) and one envelope detector (222a . . .222n), an arithmetic circuit (240) for calculating an indicator for the spread of the amplitudes of the signals of central frequency of each channel, and an evaluation circuit (250) which determines, again for display on the device (103), the value of the ultrasonic attenuation factor in the tissues examined, the evaluation being possible because of the fact that the calculated spread indicator is directly locally correlated to the attenuation factor which is the slope of the curve of the variation of the ultrasonic attenuation as a function of the frequency in the tissues examined.
4873984 TECHNIQUES FOR CALCULATING ULTRASONIC INTEGRATEDBACKSCATTER USING FREQUENCY OR TIME DOMAIN TECHNIQUES Thomas J Hunt, James G Miller, Lewis J Thomas, Hewlett E Melton, Thomas Shoup assigned to Hewlett-Packard Company Apparatus for deriving signals indicating a condition of tissue within an area by launching spaced supersonic pulses into a body under examination and detecting the power of supersonic waves scattered from locations along a plurality of known paths. Gain control elements are provided for compensating for changes in amplitude of the scattered supersonic waves resulting from their passage through blood or tissue, the increased attenuation with frequency of the spectrum of the launched pulses and the focussing of the launched pulses. Compensation for ring-down and the attenuation of the chest wall is also provided.