Ultrasonic Diagnostic Apparatus Research Articles

Ultrasonic diagnostic apparatus presenting closely correlated ultrasonic image

The ultrasonic wave generated by an ultrasonic transducer mounted at the end of an insert assembly scans a region of scanning. Ultrasonic echo is received by the transducer. A video memory stores sequentially video data of a plurality of video frames or scanning durations. With a freeze operation is commanded, the degree of coincidence between data obtained at the start of scanning and at the end of the scanning is calculated, or the degree of coincidence between two identical sounding lines but with one scanning duration apart in time therebetween is calculated. The video of highest coincidence is displayed as a still video.

Ultrasonic diagnostic method and an ultrasonic diagnostic apparatus for carrying out the same

An ultrasonic diagnostic method and apparatus are provided for enhancing real-time performance, enlarging visual field, and improving S/N ratio without sacrificing any of real-time performance, visual field and S/N ratio by field into two or more sections; generating sounding waves forming a main lobe and grating lobes to scan the sections of the visual field respectively by the main lobe and the grating lobes; separately and directively processing an echo wave received along the direction of the main lobe and echo waves received along the directions of the grating lobes to form images of the sections separately; and combining the images of the sections to display an image of the visual field.

Multi-dimensional real-time ultrasonic blood flow imaging apparatus and method

An ultrasonic diagnostic apparatus and method for real-time multi-dimensional blood flow imaging with enhanced sensitivity to lateral blood flow. The apparatus constitutes an improvement on the ultrasonic diagnostic apparatus of the type wherein an ultrasonic pulse beam is repeatedly transmitted into the subject under examination at a fixed pulse rate and the reflected echoes are picked up, amplified and displayed. The improvement comprises an ultrasonic transducer means comprising a phased array transducer which is electronically and/or mechanically divided into two or more independently controlled sub-apertures and adapted for transmitting ultrasonic pulse beams from one of the two or more sub-apertures and for receiving the reflected echoes with at least two of the two or more sub-apertures. Optionally, the apparatus and method further comprises signal processing means including quadrature detection circuitry comprising sampling means for sampling the echo signals or a downward shifted version of echo signals and Hilbert transform means for filtering the signals so as to obviate the need for mixers, low-pass filters (LPF) and quadrature reference frequencies utilized in conventional ultrasonic blood flow imaging.

Ultrasonic diagnostic apparatus capable of performing switching between single beam reception and simultaneous parallel beam reception

An ultrasonic diagnostic apparatus has a probe having a plurality of channels, a receiving circuit for dividing receiving signals from the probe to deliver them in the form of "K" (K being an integer which is 2 or more) blocks each having a predetermined number of channels, a selector circuit for selecting signals corresponding to respective ones of the blocks from output signals of the receiving circuit and delivering the selected signals, a signal distributor for selecting the output signals of the receiving circuit in the mode of single beam reception and selecting the output signals of the selector circuit in the mode of simultaneous parallel beam reception, "K" delay circuits connected to outputs of the signal distributor and each having the predetermined channels, and a switch for switching the "K" delay circuits to series connection in the mode of single beam reception and switching the "K" delay circuits to parallel connection in the mode of simultaneous parallel beam reception.

Ultrasonic diagnostic apparatuses and methods therefor

An ultrasonic diagnostic apparatus which improves the bearing resolution by dynamically changing the weighting performed on the amplitude of transmitted ultrasonic waves and/or a received wave signal. This weighting is changed with reference to the magnitude of the received wave signal. The resolution in the bearing direction is improved by increasing the wave number of the ultrasonic wave to be transmitted and by weighting the ultrasonic wave, whereas the resolution in the distance direction is prevented from being degraded as much as possible, thus making the bearing resolution substantially equal to the distance resolution. Since controlling the wave number is comparable to control of a frequency band, similar effects can also be produced by combining the control of the frequency band of a received wave signal with the weighting.

Ultrasonic diagnostic apparatus capable of acquiring high quality image by correcting phase distortion contained in ultrsonic pulses

In an ultrasonic diagnostic apparatus (1000), ultrasonic propagation time differences contained in echo signals reflected from a biological body under medical examination are corrected by comprising: a quadrature phase detecting unit (30:130:25) for quadrature-phase-detecting the echo signals derived from an ultrasonic transducer probe (2) to obtain as phase data a quadrature signal component and an in-phase signal component; a delay-time correcting value calculating unit (23) for calculating at least one of delay-time correcting values used for the energizing signals and the echo signals based upon both of the quadrature signal component and in-phase signal component: and, a delay controlling unit (13) for controlling at least one of delay time data previously given to the energizing signals and echo signals based upon one of calculated delay-time correcting values.

Ultrasonic diagnostic apparatus capable of multi−frame representation

An ultrasonic diagnostic apparatus and an image display apparatus allowing a user to select multiple images for a multi-image format display while sequentially viewing a plurality of full-screen-sized images. Viewing all of the full-sized images before displaying them in a multi-image format allows the user to benefit from the increased resolution of the images as well as requiring only a single routine to read the image data from memory.

The artificial fecundation in Japanese monkeys (Macaca fuscata) by induced ovulation and artificial insemination in nonmating season

Induced ovulation trials by PMSG-hCG administration were conducted in eleven female Japanese monkeys showing neither bleeding nor ovulation in nonmating season. The ovulation was confirmed by the laparoscopic observation in nine of the 11 females. Artificial inseminations were performed in these 9 females by the injection of semen collected by the penile electrode approach. The semen was injected into the uterine cervix in 6 females or the uterine cavity in 3 females. A gestational sac was confirmed on the ultrasonic diagnostic apparatus 19 days after ovulation in one of the 3 females inseminated into the uterine cavity. The pregnancy, however, could not be maintained.

4850363 Ultrasonic diagnostic apparatus with multiple focal lengths : Yutak Yanagawa, Tokyo, Japan assigned to Olympus Optical Co Ltd

4850363 Ultrasonic diagnostic apparatus with multiple focal lengths : Yutak Yanagawa, Tokyo, Japan assigned to Olympus Optical Co Ltd

Ultrasonic diagnostic apparatus with multiple focal lengths

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4870954 Ultrasonic diagnostic apparatus having pivotable and slidable operational table

4870954 Ultrasonic diagnostic apparatus having pivotable and slidable operational table

Doppler ultrasonic diagnostic apparatus

A Doppler ultrasonic diagnostic apparatus for measuring or displaying the velocity information of moving members within an organism by transmitting and receiving ultrasonic waves is used for ultrasonic diagnosis in the medical field and the like. The apparatus is composed of a transmission circuitry for producing two ultrasonic waves having different repetition periods and outputting an ultrasonic wave after change-over between them; a velocity calculating means for calculating the velocities of moving reflective members on the basis of the received Doppler signals from the two ultrasonic waves, for example, a velocity calculator or an autocorrelator for obtaining the autocorrelation of a received signal after converting it to a complex signal; a memory for storing the velocity information signals obtained by the velocity calculating means; and other calculating means. The velocity of the moving reflective members is obtained by calculating the difference between or the sum of the two kinds of velocity signals, or calculating the conjugate product or the complex product of the two kinds of velocity signals. The present invention makes it easy to obtain accurate velocity information by an apparatus having a simple structure.

4552021 Electro-sound transducer eliminating acoustic multi-reflection, andultrasonic diagnostic apparatus applying it

An ultrasonic diagnostic apparatus protected from multi-reflection of sound echoes. Multi-reflection is avoided by eliminating the reflection from the surface of an electro-sound transducer. This invention eliminates the surface reflection of the transducer by following three methods: (a) changing a direction of each surface of an array of transducer elements to direct the reflected sound wave away from the main direction of the sound beam; (b) applying an acoustic matching layer to a surface of a piezo-electric device of the transducer to cancel out phases of sound waves reflected by the surfaces of the layer and the device; and (c) providing an acoustic matching surface on a front or back face of the piezo-electric device to cancel out phases of sound waves reflected by the surface of the device.

4466443 Ultrasonic diagnostic apparatus for examination of a coeliac cavity

4466443 Ultrasonic diagnostic apparatus for examination of a coeliac cavity

Ultrasonic wave diagnostic apparatus to concurrently display an echo signal and a reference signal

A signal, which is the sum of an ultrasonic wave echo signal and a group of PPM (pulse-position-modulated) pulses representative of a reference signal, is applied to a cathode ray tube (CRT) and is swept along one axis by a first sweeping signal with a first frequency and along a second axis by a second sweeping signal of lower frequency. The ultrasonic echo signal and the group of PPM pulses are concurrently displayed on the CRT. Ultrasonic wave rate pulses synchronous with the first sweeping signal are applied at the first frequency to an ultrasonic transducer to emit ultrasonic waves which upon receipt are converted to an ultrasonic wave echo signal. A sawtooth wave generator circuit is provided for generating a sawtooth wave with a second frequency n times the first frequency. Here, n is an integer and equal to or larger than 2. The reference signal, such as an electrocardiographic signal, is modulated by the sawtooth wave to produce a train of pulse-position-modulated (PPM) pulses. Electronic circuitry rearranges the PPM pulses produced during a period of the rate pulse to fit within the period of a selected sawtooth wave included in the rate pulse period. The ultrasonic wave echo signal and the PPM pulses representing samples of the reference signal are added and displayed on a cathode ray table to form an M-mode image and a representation of the reference image. For every display of the ultrasonic wave echo signal corresponding to an ultrasonic wave pulse displayed, n PPM pulses representing the reference signal are displayed.

Potentialities of the type UZD-5 ultrasonic diagnostic apparatus for differential diagnosis of cancer of the thyroid.

Potentialities of the type UZD-5 ultrasonic diagnostic apparatus for differential diagnosis of cancer of the thyroid.

Drug Therapy for Neoplastic Disease in Adults

To investigate age and other factors related to the deterioration of the muscles used for swallowing, including the tongue and suprahyoid muscles.Cross-sectional study.This study included 146 participants: 47 younger adults (23 men and 24 women; age range 23-44 years) recruited from a dental hospital and 99 community-dwelling older adults (37 men and 62 women, age range 65-86 years).Age (<65 years or ≥65 years), body mass index (BMI), skeletal muscle mass index (SMI), and tooth loss (Eichner classification) were measured. The cross-sectional areas (CSAs) of the tongue, geniohyoid muscle, and anterior belly of the digastric muscle were measured using an ultrasonic diagnostic apparatus. The correlation between each muscle's CSA and strength was examined. Multiple regression analyses were performed separately for each sex using each muscle CSA as the dependent variable and age, BMI, SMI, and the Eichner classification as explanatory variables.Older men had a significant positive correlation between tongue pressure and CSA (r = 0.35, P = .031). Jaw opening force was positively correlated with geniohyoid muscle CSA (r = 0.41, P = .001) in older women. In the multiple regression analysis, age, BMI, and SMI were significantly associated with tongue CSA in men. Age was significantly and inversely associated with suprahyoid muscle CSA in both men and women. No explanatory variables were significantly associated with geniohyoid muscle CSA except age.The tongue increased in volume, and the suprahyoid muscles underwent atrophy with age. The study results suggest that interventions to prevent dysphagia associated with aging should be tailored toward specific muscles. Direct muscle training is required for the suprahyoid muscles, whereas the maintenance of tongue muscle mass and function, as well as training for the tongue, requires attention to ensure optimal nutritional status and whole-body skeletal muscle mass.

Diagnosis of Gholelithiasis by Using the Ultrasonic Diagnostic Apparatus

Diagnosis of Gholelithiasis by Using the Ultrasonic Diagnostic Apparatus