Hitachi Medical Corporation

Asahi Kasei Kabushiki Kaisha

Other

Hitachi, Ltd.

Asahi Kasei Chemicals Corporation

Yugengaisha Misuzu

Yuichi Miwa

Ryuichi Shinomura

Takashi Azuma

Shin-ichiro Umemura

Satoshi Tamano

Hirotaka Baba

Kageyoshi Katakura

Shinichiro Umemura

Hiroshi Masuzawa

Yutaka Sato

Takashi Sugiyama

Hiroshi Kanda

Jun Kubota

Masakazu Yamauchi

Hiroshi Kuribara

Kenichi Kawabata

Katsuhiro Kuroda

Takashi Fukuchi

Katsuhiro Fujimoto

Shinji Kishimoto

Shizuo Ishikawa

Hideyuki Ban

Kazunari Ishida

Kazuaki Sasaki

Shuzo Sano

Shin-ichi Kondo

Koichiro Azuma

Kie Shinomiya

Yoshijiro Harada

Naoto Fujita

Takaya Osawa

Eiko Tanaka

Masako Uchida

Junya Tsujita

A blocked polyisocyanate composition containing a blocked polyisocyanate obtained from a polyisocyanate and at least one blocking agent, wherein the blocking agent contains a compound represented by general formula (I) shown below, and the amount of methane tetracarbonyl structures represented by general formula (II) shown below, relative to the total molar amount within the blocked polyisocyanate of bonded structures in which the compound represented by general formula (I) is bonded to the polyisocyanate, is at least 0.5 mol % but not more than 10 mol %.

Blocked polyisocyanate composition and use thereof

A coating method in which a first coating composition is applied to the surface of an object to be coated to obtain a first uncured coating film, a second coating composition is applied to the first uncured coating film to obtain a second uncured coating film, and the first uncured coating film and the second uncured coating film are then cured simultaneously by heating, wherein the first coating composition contains a hydroxyl group-containing resin component and the second coating composition contains an isocyanate component containing a triisocyanate represented by general formula (I) (in the formula, the multiple Yeach independently are a single bond or a C1-20 divalent hydrocarbon group which optionally contains one or more selected from the group consisting of an ester group and an ether group, and Ris a hydrogen atom or a C1-12 monovalent hydrocarbon group) and the above-mentioned hydroxyl group-containing resin component, is provided. 

Coating method and coating film

The present invention provides a polyisocyanate composition and the like that contain a polyisocyanate compound represented by general formula (I), (II), (III) or (IV) (wherein the pluralities of R, R, Rand Reach independently represent an organic group, at least one of the pluralities of R, R, Rand Ris a group represented by general formula (V) (wherein each of the plurality of Yindependently represents a single bond or the like, Rrepresents a hydrogen atom or the like, and the wavy line indicates a bonding site) or the like, and in general formula (III), Rrepresents a residue in which one hydroxyl group has been removed from a monohydric or polyhydric alcohol). 

Polyisocyanate composition, blocked polyisocyanate composition, hydrophilic polyisocyanate composition, coating material composition, and coating film

A polyisocyanate composition having a polyisocyanate, which is a reaction product of:

Polyisocyanate composition and method of manufacturing the same, blocked polyisocyanate composition and method of manufacturing the same, resin composition, curable resin composition and hardened material

An ultrasonographic technique capable of forming a transmission beam enabling multi-beam transmission/reception of identical transmission sensitivity. An ultrasonographic device for imaging inside of an examinee includes a transmitter for transmitting an ultrasonic pulse signal from an ultrasonic element array to the examinee, and a receiver for receiving the ultrasonic pulse reflected from the examinee. The transmitter transmits an ultrasonic pulse signal having a plurality of peaks of substantially equal transmission intensity in the azimuth direction and a trace in the depth direction of each peak as a substantially straight line, from a transmission opening of the ultrasonic element array to the examinee.

Ultrasonographic device

An ultrasonograph capable of generating a transmission beam having a uniform width over a wide range in an ultrasonic wave propagation direction is provided. A weighted mean value of a plurality of transmission delay time values corresponding to focal lengths of transmission pulse waves set in the ultrasonic wave propagation direction is calculated for each element constituting a transmission aperture and used as the delay time for the element when waves are transmitted. As the weight used for obtaining the weighted mean value, a transmission effective aperture width according to each transmission focal length is selected, and a weight in the direction of the transmit aperture realizing the width is calculated and is used in a focal length direction.

Ultrasonograph

An ultrasonograph capable of generating a transmission beam comprising a main beam having a uniform width over a wide range in an ultrasonic wave propagation direction by one-time transmission of an ultrasonic pulse. A weighted mean value of a plurality of transmission delay time values corresponding to focal lengths of transmission pulse waves having a plurality of focal points which are set in the ultrasonic wave propagation direction is calculated for each of elements constituting a transmission aperture and used as the delay time. The curvature of a transmitted wave front is close to a short focal length in the center portion of the transmit aperture and is close to a long focal length in the peripheral portion. Thus, a transmission beam including a relatively narrow main beam with a uniform width over a wide range in the ultrasonic wave propagation direction can be generated.

There are provided an ultrasonic imaging system and method which can correct a phase shift effect to image a real change in acoustic impedance in a living body. An ultrasonic probe transmits an ultrasonic beam to an object to receive an echo. A transmit beamformer transmits a transmit signal via transmit/receive SWs to the probe in delay time matched with a transmit focal point according to the signal under the control of a control system. An ultrasonic signal returned from the object to the probe is converted to an electric signal by the probe to be transmitted via the transmit/receive SWs to a complex receive beamformer. The complex receive beamformer performs dynamic focus adjusting delay time according to reception timing. A phase shift correction part uses the output of the complex beamformer outputting beams of a real part and an imaginary part to correct phase shift. due to frequency-dependent attenuation, correct phase shift in the lateral direction of the beam, or correct both. After phase shift correction, an acoustic impedance change amount operation part obtains a derivative about the space position of acoustic impedance. The signal subject to filtering processing is image displayed via a scan converter on a display part.

Ultrasonic imaging system and method

An ultrasonic diagnostic apparatus transmits an ultrasonic beam into an object to be examined using a multi-ring arrangement formed with transducer elements arrayed two-dimensionally in concentric rings and receives an echo so as to create a tomogram or a three-dimensional image of the object. To correct for focusing error due to the difference in length of ultrasound propagating paths, the ultrasonic diagnostic apparatus groups the transducer elements so as to form a multi-ring arrangement, transmits/receives ultrasonic beams with a delay to each ring of the multi-ring arrangement and scans the ultrasonic beam so as to create an ultrasonic image, measures delay error due to presence of a sound speed non-uniformity portion of the object and changes either the coupling of the multi-ring or the delay time based on the measurement error.

Ultrasonic diagnosing apparatus

An ultrasonic imaging arrangement performs tentative scanning of ultrasound to the inside of a living body with delay time corresponding to average sonic velocity, calculates delay time error in a delay time error detecting circuit by using received signals from each channel to which delay control has been performed in a digital delay circuit, compares in a delay time comparing unit the calculated data with a plurality of delay time error data corresponding to various sonic velocities using sound velocity as the parameter stored before hand in a sound velocity-derived delay time error storing unit, selects among those sonic velocities the one matching the delay time error data with a sonic velocity selecting unit, and calculates the sonic velocity within the living body. The calculated sonic velocity is fed back to CPU, and the delay data on the delay applied in the ultrasonic scanning is provided to a delay circuit.

Ultrasonic imaging device

An ultrasonic imaging apparatus and method combines dynamically focused reception and coded transmission/reception technologies by inexpensive circuitry. A receive aperture is divided into smaller apertures. Correspondingly, a receive beam former is divided into receive sub-beam formerstoby which a phase alignment and summing process is performed. Thereafter, coded signals are compressed in decoderstoin a time axis direction. Output signals from the decoders are once again subjected to a phase alignment and summing process in a second beam former.

Ultrasonic imaging apparatus and method

An ultrasonic diagnostic apparatus acquires images different in a frequency. The invention is composed of a transducer including plural elements for sending an ultrasonic wave and receiving the reflected ultrasonic wave, analog to digital converters that digitize plural received signals, first mixers that respectively multiply a signal from the converter and a first digital reference signal, first filters that respectively extract a signal having a predetermined center frequency from a signal from each first mixer, digital delay units that respectively delay a signal from each first filter, an adder that adds plural signals from the digital delay units, and a second mixer that multiplies a signal from the adder and a second digital reference signal. An envelope detector detects a signal from the second mixer, and a scan converter converts a signal from the detector to a picture signal for display, so the pass band of the filter is not required to be changed.

Ultrasonic diagnostic apparatus and method for processing ultrasonic signal

An ultrasonic probe in which two-dimensional array transducer elements are arrayed convexly both in one direction of the two-dimensional array and in the direction perpendicular to the former direction relative to the direction where an ultrasonic wave is transmitted. By switching a transducer element selecting switch circuit provided near the transducer elements, the shape of the diameter of the probe for transmitting and receiving of ultrasound and the position of the diameter are arbitrarily determined. An ultrasonic diagnostic apparatus in which a fresnel ring is formed as an diameter by a control signal to a transducer element selecting switch circuit, the number of cables for connection between the probe and the main body is decreased by bundling the transducer elements in one ring and effecting the connection, the fresnel ring is moved every ultrasonic transmission/reception cycle by the control signal to the transducer element selection switching circuit, and an object is three-dimensionally scanned with an ultrasonic beam.

Ultrasonic probe and ultrasonic diagnostic device comprising the same

This invention provides a technology that freely changes the frequency of a reference signal in a digital ultrasonic diagnosis device and makes it possible to conduct various high-quality or high-speed imaging. Reception signals obtained by an ultrasonic element group disposed in an array are digitized in a sampling cycle higher than a Nyquist frequency of the reception signals, and are mixed with reference signal. The mixed signals are then accumulated in a sampling direction, a number of the mixed signals accumulated being equal to a number of a plurality of samples, and are delayed and added by wave reception focusing means. The reference signal serially read out and used from memory means in such a manner as to correspond to the sampling number of the reception signals. A reference signal train acquired from signals, the frequency of which decreases gradually with a lapse of time, from wave transmission, or a reference signal train obtained alternately from two signals having different frequencies, may be stored in advance in memory means.

Ultrasonic diagnosis device

An ultrasonic diagnostic apparatus in which the distortion of the received wave signal due to the ununiformity of the interior of an human body can be reduced accurately with a small circuit scale and an ultrasonic image of high resolution can be produced. The apparatus comprises a probe including an arrangement of elements for transmitting and receiving ultrasonic pulses to and from the interior of a subject, delay means for delaying the wave signal received from each element of the probe, and a plurality of adder means connected in series to the output of the delay means for adding the output signal of the preceding stages thereby to form an ultrasonic beam. The apparatus further comprises correlation means for calculating the correlation of two or more output signals of any of the adder means, and delay correcting means for estimating as many delay correction amounts as the input signals to the delay means from the time difference between adjacent signals generated from the correlation means thereby to correct the delay time of the received wave signal.

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Tokyo, Japan

Yuichi Miwa