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| Number | Title | Issue Date |
| 4671294 | Pulsed doppler flow mapping apparatus A pulsed Doppler imaging system is shown in which velocity of a fluid is attained by multiplying the quadrature samples of the reflections of one burst with the conjugate of the quadrature samples of the reflections of a previous burst for a number of pai... | 06/09/1987 |
| 4660565 | Ultrasonic imaging apparatus using pulsed Doppler signal In an ultrasonic imaging apparatus using pulsed Doppler signal, the amplitudes of the reflected echo signals are decreased in accordance with a depth of the body. The echo signals received by the transducer are detected in the phase detectors in such a ma... | 04/28/1987 |
| 4641668 | Ultrasonic blood flow imaging method and apparatus An ultrasonic blood flow imaging method for two-dimensionally displaying the velocity distribution of blood flow within a body to be examined is characterized in that the velocity distribution is displayed as a color picture in which the velocity directio... | 02/10/1987 |
| 4640292 | Extending sample volume in pulsed Doppler systems The sampling volume of a pulsed Doppler system is increased to a length greater than that corresponding to one pulse by sampling the reflections of each launched pulse a plurality of successive times and accumulating the samples.... | 02/03/1987 |
| 4630612 | Ultrasonic diagnostic apparatus An ultrasonic diagnostic apparatus capable of providing a B-mode tomographic image of and Doppler information on a moving member in a living subject. The apparatus comprises a cursor setting device which supplies a signal for displaying a cursor at a pres... | 12/23/1986 |
| 4622977 | Ultrasonic diagnostic apparatus An ultrasonic diagnostic device capable of the accurate real-time measurement and display of the amount of deviation in the velocity distribution of moving objects within a living organism. This apparatus represents an improvement on the ultrasonic diagno... | 11/18/1986 |
| 4612937 | Ultrasound diagnostic apparatus An ultrasound diagnostic apparatus for displaying two-dimensional blood flow information superimposed over anatomical information. A transducer generates a series of ultrasound bursts which are directed towards the area of the body where blood flow and an... | 09/23/1986 |
| 4607642 | Unaliased quadrature audio synthesizer The apparatus described unaliases a Doppler signal which is related to the velocity of blood flowing in a sample volume. It then generates an audio output corresponding to the unaliased Doppler signal. The device generates an unaliased, instantaneous sign... | 08/26/1986 |
| 4598716 | Doppler method and apparatus for measuring fluid motion A method and apparatus for determining fluid motion of a fluid through a conduit whereby the signal pulse repetition frequency of a pulsed Doppler is increased significantly over known systems and the receiving means for the reflected signals is kept acti... | 07/08/1986 |
| 4593700 | Ultrasonic wave blood flow meter An ultrasonic wave blood flow meter comprises a probe which sends to and receives an ultrasonic wave reflected with Doppler effect from the blood flow, a detecting circuit for converting a frequency variation of the received reflected wave into a first si... | 06/10/1986 |
| 4583409 | Method for measuring the flow parameters of a fluid and device utilizing the method The invention relates to a method of measuring the flow parameters of a fluid, and to a device utilizing this method, in which the autocorrelation function of the signal transmitted back by a particle of the fluid in motion is calculated. The mean speed a... | 04/22/1986 |
| 4583552 | Apparatus for observing blood flow patterns An apparatus for observing blood flow patterns by utilizing ultrasonic beams which includes at least a pulse generator, a transducer, first and second phase detectors, and a monitor. The ultrasonic beams are transmitted and received by the transducer to o... | 04/22/1986 |
| 4582067 | Method for endoscopic blood flow detection by the use of ultrasonic energy Various forms of a catheter that is sized to pass through the biopsy channel of an endoscope include an elongated catheter tube of flexible material and an ultrasonic probe carried by the catheter tube adjacent its tip. The forms include: a papillotome ca... | 04/15/1986 |
| 4573477 | Ultrasonic diagnostic apparatus An ultrasonic diagnostic apparatus for accurately displaying the velocity distribution of moving members within a living organism. The apparatus constitutes an improvement on the ultrasonic diagnostic apparatus of the type wherein an ultrasonic pulse beam... | 03/04/1986 |
| 4563899 | Ultrasonic imaging apparatus using transducer control In an ultrasonic imaging apparatus, the pulser applies drive pulses to the transducer element. Depending upon the transducer characteristics and the scanning mode of the ultrasonic beams, the pulser is required to apply proper drive voltage to a given tra... | 01/14/1986 |
| 4559952 | Method of ultrasonically measuring blood flow velocity Method and apparatus for ultrasonic blood flow velocity measurement based upon the doppler principle (doppler measurement), combined with simultaneous echo amplitude imaging by employing ultrasonic pulses (echo imaging). The method is used for investigati... | 12/24/1985 |
| 4554926 | Ultrasonic pulse Doppler blood flow meter with provision to create ultrasonic test waves which, when reflected from a stationary object, result in echoes similar to those produced by a moving object An ultrasonic pulse Doppler blood flow meter which has: a rate pulse generator for outputting a rate pulse, a pulser receiving the rate pulse for outputting a drive pulse, a transducer excited by the drive pulse for transmitting an ultrasonic wave into an object to... | 11/26/1985 |
| 4552152 | Ultrasonic diagnostic apparatus using Doppler effect Ultrasonic echo signals are detected in phase and integrated with a period corresponding to an ultrasonic pulse. The integrated values are sampled and the difference between two integrated values is successively frequency-analyzed.... | 11/12/1985 |
| 4534357 | Multiple demodulation frequency Doppler The device uses two Doppler receivers having different center frequencies. After the mean Doppler frequency of each receiver is determined, one of the mean Doppler frequencies is subtracted from the other one of the mean Doppler frequencies, thereby provi... | 08/13/1985 |
| 4530363 | Transducer array for sector scan and doppler flow measurement applications An array of transducer elements which can be selectively actuated as a linear array for sector scanning and selectively actuated as a plurality of concentric annular arrays for focused Doppler blood flow measurements.... | 07/23/1985 |
| 4509525 | Ultrasonic diagnostic equipment An ultrasonic diagnostic system is disclosed, which comprises an ultrasonic transducer array having plural transducer elements for transmitting an ultrasonic beam and generating echo signals from the echos reflected from an object, a circuit for exciting ... | 04/09/1985 |
| 4501277 | Selected beam marking system for rapid ultrasound measurements An ultrasonic pulse Doppler apparatus comprising an ultrasonic probe for transmitting ultrasonic beam into an object and receives the echoes from the object, a first processing circuit for processing the echoes received by the probe to form data of a B sc... | 02/26/1985 |
| 4485821 | Doppler effect blood flow sensing device displaying signals lying within a band width related to sampling frequency A pulsed ultrasound Doppler blood flow sensing device includes a band pass filter for extracting only the Doppler frequency shift signals from the sampled and held signals, the band pass filter having a band pass characteristic in which a variation of an ... | 12/04/1984 |
| 4416286 | Ultrasonic blood flow measuring apparatus An ultrasonic blood flow measuring apparatus comprising: an ultrasonic probe for transmitting an ultrasonic beam into a tissue under examination in response to an electrical driving pulse and for receiving an ultrasonic echo reflected from the tissue to conver... | 11/22/1983 |
| 4407293 | Ultrasound imaging apparatus for providing simultaneous B-scan and Doppler data An ultrasound imaging apparatus is described. The hand-held device includes a first oscillating transducer for providing a B-scan display and an offset second transducer which is manually positioned for providing Doppler data. The transducer pulses are in... | 10/04/1983 |
| 4398540 | Compound mode ultrasound diagnosis apparatus B-mode image data obtained by using an electronic linear scanning probe are loaded into a first memory area of a frame memory in a memory format corresponding to a B-mode ultrasound beam. An ultrasound echo signal corresponding to a given location on the ... | 08/16/1983 |
| 4334543 | Method and apparatus for flow velocity determination A method of determining flow velocities by measuring the phase difference between Doppler signals derived from wave pulses and reflected by substantially the same reflector at two different times, the interval between the times being predetermined, a pair... | 06/15/1982 |
| 4327739 | Noninvasive measurement of blood flow rate utilizing ultrasound In order to perform a non-invasive measurement of the blood flow rate in the smallest vessels, i.e. the capillaries, of a blood vessel bed, and to detect the presence of erythrocyte aggregations therein, acoustic pulses containing oscillations at a freque... | 05/04/1982 |
| 4324258 | Ultrasonic doppler flowmeters In an ultrasonic Doppler flowmeter system for the measurement, imaging and mapping of blood flow, a transducer coupled to a patient's skin is caused to emit pulses of high frequency ultrasound waves. The resulting echo signals are received by the transduc... | 04/13/1982 |
| 4320765 | Doppler pseudorandom noise velocimeters This invention is directed to improved pseudorandom noise velocimeters and methods therefor, using the Doppler effect, to enable the external measurement of the speed of a moving target within a fixed conveying medium. In accordance with a preferred embod... | 03/23/1982 |
| 4265126 | Measurement of true blood velocity by an ultrasound system Two components of the velocity of blood or similar liquids and the true flow vector are derived by a linear transducer array cross-beam configuration. Ultrasound pulses are transmitted from the center elements and backscattered echoes are received by left... | 05/05/1981 |
| 4217909 | Directional detection of blood velocities in an ultrasound system The velocity and direction of the flow of blood and similar liquids, toward or away from the transducer, are measured by coherent demodulation of the received echoes in two quadrature components and subsequent real time processing by a complex Fourier tra... | 08/19/1980 |
| 4205687 | Color coded blood flow velocity display equipment A method and apparatus are disclosed for providing a picture of a portion of a blood vessel by a color coded display of normal and increased blood flow peak velocities at a plurality of locations within the blood vessel portion from ultrasonic doppler ve... | 06/03/1980 |
| 4182173 | Duplex ultrasonic imaging system with repetitive excitation of common transducer in doppler modality A duplex imaging system with a common transducer array for both modes of operation satisfies the conflicting bandwidth requirements by single impulse excitation of the transducer in B-scan imaging operation to generate a wide bandwidth ultrasound pulse an... | 01/08/1980 |
| 4141347 | Real-time ultrasonic B-scan imaging and Doppler profile display system and method Pulsed real-time B-scan ultrasonic method and apparatus are disclosed together with pulsed Doppler Ulrasonic method and apparatus. The B-scan apparatus includes a pulse operated transmitter and receiver operating at a first frequency, and the Doppler appa... | 02/27/1979 |
| 4127842 | Apparatus for the measurement of flowing media according to the ultrasonic doppler method To compensate the Doppler flow measurement for the angle of the ultrasonic beam relative to the flowing medium, the ultrasonic applicator includes a mechanical electrical angular position sensor for generating a signal as the applicator is shifted from a ... | 11/28/1978 |
| 4097835 | Dual transducer arrangement for ultrasonic imaging system Combination Doppler and B-scan ultrasonic imaging apparatus is disclosed which includes visual display means for the simultaneous visual display of received ultrasonic Doppler and B-scan information. The apparatus includes first and second focused transdu... | 06/27/1978 |
| 3939707 | Measurement of liquid flow A method of pulse-echo ultrasonic examination of an object, particularly in medical diagnostic examination, to measure flow of liquid in a vessel within the object comprises determining the dimensions and orientation of the vessel and the shift in frequen... | 02/24/1976 |
