Kabushiki Kaisha Toshiba

Toshiba Medical Systems Corporation

Takahiro Sekiguchi

Koji Akita

Toshiyuki Nakanishi

Kazuya Okamoto

Sojuro Kato

Ichiro Seto

Tatsuma Hirano

Hiroshi Yoshida

Kazuhiro Inoue

Hideo Kasami

Makoto Higaki

Noritaka Deguchi

Takehiko Toyoda

A wireless communication system includes a first tag installed on a ground outside a track for a running train, the first tag being driven by wirelessly received power, a second tag installed outside a side face of the train and above the first tag, the side face extending in a running direction, the second tag being driven by wirelessly received power, a wireless communicator which is installed in the train and performs wireless communication with the first tag and the second tag, and an antenna which is installed in the train and has a gain in directions of the first tag and the second tag.

Wireless communication system and wireless communication apparatus

An information processing apparatus includes a receiving unit and a determining unit. The receiving unit receives read information that is read by a reading unit from a storage medium a plurality of number of times. The determining unit determines abnormality in a reading process performed by the reading unit, based on a first result acquired by comparing a time interval of reading the read information with a first threshold, or on a second result acquired by comparing the number of times the reading is performed with a second threshold.

Information processing apparatus, information processing method, and computer program product

According to one embodiment, an apparatus includes a control unit and a coil unit. The control unit generates a first clock signal, generates a data signal to indicate an operating condition, modulates the first clock signal by the data signal to obtain a modulated signal, generates a clock transmission signal including the modulated signal, and emits the clock transmission signal. The coil unit converts the clock transmission signal into an electric signal, detects the modulated signal from the clock transmission signal, generates a second clock signal synchronous with the first clock signal from the modulated signal, detects an MR signal generated in a subject, digitizes, synchronously with the second clock signal, the MR signal, detects the data signal from the detected modulated signal by using of the second clock signal, controls the operating condition of the coil unit to be the operating condition indicated by the data signal.

MRI RF coil control signals modulated onto the RF coil clock signal

According to one embodiment, a wireless transceiver system includes a transmitter and a receiver. The transmitter includes a first generator, a second generator, a third generator. The second generator generates fixed data item that has bit values corresponding to the clock signal. The third generator performs OFDM modulation for the fixed data item. The receiver includes a first detector, a second detector, a PLL, a controller. The first detector is configured to detect an envelope that indicates amplitude in a time waveform. The controller is configured to control to operate the PLL from a first time point when the head part is detected to a second time point when a first period is elapsed.

Wireless transceiver system and method

According to one embodiment, an MRI apparatus includes a probe unit and a control/imaging unit. The probe unit includes a probe, a converter, a compressor and a transmitter. The control/imaging unit includes a receiver, an expander and a reconstructor. The probe detects an RF echo signal generated in a subject by a magnetic resonance phenomenon. The converter digitizes the detected signal. The compressor compresses the digitized signal in accordance with a predetermined compression parameter to obtain a compressed signal. The transmitter generates a transmission signal to wirelessly transmit the compressed echo signal and sends the transmission signal to a radio channel. The receiver receives the transmission signal and extracts the compressed signal from the received signal. The expander expands the extracted compressed signal in accordance with the parameter to obtain the RF echo signal. The reconstructor generates a video signal regarding the subject on the basis of the obtained signal.

Magnetic resonance imaging apparatus and method with wireless transmission of compressed echo signals that are expanded and extracted at the receiver

In one embodiment, an MRI apparatus includes first and second clock generators, a pulse generator, transmission and reception coils, pulse and phase detectors, and a corrector. The pulse generator generates an excitation pulse signal based on a clock signal generated by the first clock generator. The reception coil outputs a radio frequency signals corresponding to an excitation pulse transmitted from the transmission coil or an MR echo. The converter digitizes, synchronously with a clock signal generated by the second clock generator, the radio frequency signal, to obtain radio frequency data. The pulse detector detects excitation pulse data corresponding to the excitation pulse from the radio frequency data. The phase detector detects a phase of a pulse indicated by the detected excitation pulse data. The corrector corrects the radio frequency data based on the detected phase, to compensate for a phase offset which occurs in the echo during the digitization.

Magnetic resonance imaging apparatus including elements for phase correction of wireless transmissions

According to one embodiment, a apparatus includes a coil, a clock generator, an echo transmitter, a carrier generator, a clock transmitter, a regenerator, an receiver, a reconstructor, a detector, and a controller. The echo transmitter generates and transmits an echo transmission signal synchronously with a clock signal generated by the clock generator to wirelessly transmit an echo signal output from the col. The carrier generator generates a carrier signal have a frequency within a variable range. The clock transmitter wirelessly transmits a clock transmission signal. The regenerator regenerates the clock signal based on the transmitted clock transmission signal. The receiver extracts the echo signal synchronously with the regenerated clock signal from the transmitted echo transmission signal. The detector detects a frequency of an interference wave. The controller controls the carrier generator to generate the carrier signal having a frequency which comparatively small interference with respect to the detected frequency.

Magnetic resonance imaging apparatus having controller that sets carrier frequencies outside detected interference bands

A magnetic resonance imaging apparatus includes a probe unit and a control/imaging unit. The probe unit includes a converter converting a sampled magnetic-resonance signal into a digital signal, a first transmitter converting the digital signal into a first-radio signal, a first receiver receiving and performing detection on the second-radio signal to obtain a first-received signal, and a clock-regeneration unit regenerating a clock component from the first-received signal to generate a regenerated-clock signals. The control/imaging unit includes a second-receiver receiving the first-radio signal to obtain a second-received signal, a data processor performing data processing on the second-received signal in synchronism with a reference-clock signal to obtain a video signal, and a second transmitter which modulates a carrier wave using the reference-clock signal, converts the reference-clock signal into the second-radio signal, and transmits the second-radio signal through the second-wireless channel.

Wireless magnetic resonance imaging apparatus generating synchronized clock-regenerated signals and video

This radar device includes: a transmitter to transmit a transmitting signal whose frequency is periodically increased/decreased at a predetermined rate of change; a mixer to generate a beat signal by multiplying a received signal being transmitted by the transmitter and reflected back from an object to be detected and the transmitting signal; a frequency detector to detect a frequency of the beat signal; and a controller to control the rate of change of the frequency of the transmitting signal so that the frequency of the beat signal detected by the frequency detector becomes equal to or larger than a cut-off frequency of a flicker noise caused by the mixer.

Radar device and control method of radar device

A radio receiver comprises a first amplifier to amplify a received radio signal; a quadrature demodulator to demodulate the radio signal amplified by said first amplifier and thereby generate a baseband signal; a second amplifier to amplify the baseband signal; a demodulator to demodulate the baseband signal amplified by said second amplifier; and a gain controller to control timing of a change in a gain of said second amplifier, in case that changing the gain of said first amplifier and the gain of said second amplifier, on the basis of a gain of said first amplifier before and after the change.

Growing community of inventors

Yokohama, Japan

Takahiro Sekiguchi