Patent application number | Description | Published |
20080224701 | Magnetic resonance imaging apparatus and radio freqeuncy coil unit - A radio frequency coil unit includes a plurality of surface coils and a distributing/combining unit. The plurality of surface coils are arranged in a body-axis direction. The distributing/combining unit distributes and combines reception signals output from the plurality of surface coils to generate a new reception signal. | 09-18-2008 |
20080231278 | RADIO-FREQUENCY COIL AND MAGNETIC RESONANCE IMAGING APPARATUS - A radio-frequency coil has a first element and a second element both being adjacently arranged so as to nip a division/join portion. The first element has a first main loop portion provided along an arrangement plain surface and a first sub-loop portion provided along a surface substantially perpendicular to the arrangement plain surface. The second element has a second main loop portion provided along the arrangement plain surface and a second sub-loop portion provided facing the first sub-loop. The first sub-loop portion and the second sub-loop portion generate an induced electromotive force such that, among magnetic fields generated when a current flows in one coil, a summation of the magnetic fields, which interlink with the other coil, becomes zero. | 09-25-2008 |
20080272783 | MAGNETIC RESONANCE IMAGING APPARATUS AND MAGNETIC RESONANCE IMAGING METHOD - A magnetic resonance imaging apparatus that applies a gradient magnetic field and a radio-frequency magnetic field to a subject in a static magnetic field to image the subject based on magnetic resonance signals emitted from the subject, includes a unit which generates K transmission radio-frequency pulse signals required to produce the radio-frequency magnetic field, an allocation unit which allocates the K transmission radio-frequency pulse signals to K in M transmission signal paths, a connection unit to which at most M radio-frequency coils are attachable and which selectively connects the M transmission signal paths and M reception signal paths to the radio-frequency coils, a selection unit which selects N in magnetic resonance signals which are respectively received by the at most M radio-frequency coils and transmitted through the at most M reception signal paths, and a unit which performs reception processing for each of the selected N magnetic resonance signals. | 11-06-2008 |
20090058420 | Magnetic resonance apparatus and control method for the same - A magnetic resonance apparatus includes a coil which receives a magnetic resonance signal from a subject, a transmitting unit which transmits the magnetic resonance signal received by the coil with a radio signal of a frequency band different from that of the magnetic resonance signal, an unit which extracts the magnetic resonance signal from the radio signal, a battery which supplies power to the transmitting unit, a switch unit which turns on and off power supply from the battery to the transmitting unit, a unit which wirelessly transmits a startup signal and a stop signal, a receiving unit which receives the startup signal and the stop signal that have been wirelessly transmitted, and a unit which controls the switch unit to turn on the power supply when the receiving unit receives the startup signal and turn off the power supply when the receiving unit receives the stop signal. | 03-05-2009 |
20090267600 | Array coil and magnetic resonance imaging apparatus - ABSTRACT OF THE DISCLOSURE An array coil including at least three conductive elements arranged at predetermined intervals, each of the conductive elements being in the form of a loop, and a plurality of switches that enable the conductive elements to be connected together according to a plurality of connecting patterns. | 10-29-2009 |
20090322330 | MAGNETIC RESONANCE IMAGING APPARATUS AND MAGNETIC RESONANCE IMAGING METHOD - A magnetic resonance imaging apparatus includes an imaging condition acquisition unit and an imaging unit. The imaging condition acquisition unit acquires at least one of an amplitude and a phase of a radio frequency transmission signal so as to reduce a deviation of data in at least one region of interest set in an object. The imaging unit acquires image data by imaging according to an imaging condition including at least the one of the amplitude and the phase. | 12-31-2009 |
20090322335 | MAGNETIC RESONANCE DIAGNOSTIC APPARATUS, MAGNETIC RESONANCE DIAGNOSTIC MAIN UNIT AND COIL UNIT - An magnetic resonance diagnostic apparatus which includes a main unit and a coil unit, the magnetic resonance diagnostic apparatus including a sampling clock generating unit which generates a sampling clock signal, a sampling clock transmitting unit wirelessly transmits the sampling clock signal, a sampling clock receiving unit which receives the transmitted sampling clock signal, a receiving coil which outputs an electrical magnetic resonance signal in response to a magnetic resonance signal emitted from a subject as electromagnetic radiation, a digitization unit which digitizes, synchronously with the received sampling clock signal, the outputted magnetic resonance signal, a resonance signal transmitting unit which wirelessly transmits the digitized magnetic resonance signal, a resonance signal receiving unit which receives the transmitted magnetic resonance signal, and a reconstruction unit which processes, synchronously with the generated sampling clock signal, the received magnetic resonance signal and thereby reconstructs an image of the subject. | 12-31-2009 |
20100244838 | RF coil assembly for MRI using differently shaped and/or sized coils - A radio frequency coil assembly is provided that includes a first radio frequency coil for receiving a magnetic resonance signal from a tested body; a second radio frequency coil for receiving a magnetic resonance signal from the tested body; and a third radio frequency coil for receiving a magnetic resonance signal from the tested body and having a shape that is different from that of at least one of the first and second radio frequency coils so as to increase local sensitivity in an image-picked-up region. | 09-30-2010 |
20110101977 | MAGNETIC RESONANCE IMAGING APPARATUS AND MAGNETIC RESONANCE IMAGING METHOD - According to one embodiment, an MRI apparatus includes a probe unit and a control/imaging unit. The probe unit includes an probe, an converter, an compressor and a transmitter. The control/imaging unit includes a receiver, an expander and an 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. | 05-05-2011 |
20110101980 | MAGNETIC RESONANCE IMAGING APPARATUS - According to one embodiment, a magnetic resonance imaging apparatus includes; an imaging area setting unit configured to set an imaging area for a patient according to an imaging condition; an excitation angle determination unit configured to collect magnetic resonance signals from the imaging area by a pre-scan and to determine, on the basis of the collected magnetic resonance signal, an optimal excitation angle of a radio-frequency magnetic field for use in an imaging scan; and an imaging unit configured to acquire imaging data by carrying out the imaging scan of the set imaging area for the patient applying the radio-frequency magnetic field with the determined optimal excitation angle. | 05-05-2011 |
20110109316 | MAGNETIC RESONANCE IMAGING APPARATUS, PHASE COMPARATOR, CONTROL UNIT AND COIL UNIT - 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. | 05-12-2011 |
20110227571 | MAGNETIC RESONANCE IMAGING APPARATUS - 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. | 09-22-2011 |
20110227574 | MAGNETIC RESONANCE IMAGING APPARATUS - 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. | 09-22-2011 |
20110298459 | MAGNETIC RESONANCE IMAGING APPARATUS AND MAGNETIC RESONANCE IMAGING METHOD - A magnetic resonance imaging apparatus includes an imaging condition acquisition unit and an imaging unit. The imaging condition acquisition unit acquires at least one of optimum amplitude and optimum phase of a radio frequency transmission signal so as to reduce a deviation of data in at least one region of interest set in an object. The imaging unit acquires image data by imaging according to an imaging condition including at least one of optimum amplitude and optimum phase. | 12-08-2011 |
20120153954 | RF COIL DEVICE AND MAGNETIC RESONANCE IMAGING APPARATUS - In one embodiment, an RF coil device ( | 06-21-2012 |
20120153957 | RF COIL ASSEMBLY FOR MRI USING DIFFERENTLY SHAPED AND/OR SIZED COILS - A radio frequency coil assembly is provided that includes a first radio frequency coil for receiving a magnetic resonance signal from a tested body; a second radio frequency coil for receiving a magnetic resonance signal from the tested body; and a third radio frequency coil for receiving a magnetic resonance signal from the tested body and having a shape that is different from that of at least one of the first and second radio frequency coils so as to increase local sensitivity in an image-picked-up region. | 06-21-2012 |
20130234710 | PET-MRI APPARATUS - In a PET (Positron Emission Tomography)-MRI (Magnetic Resonance Imaging) apparatus of an embodiment, a transmitting radio frequency coil applies a radio frequency magnetic field on a subject placed in a static magnetic field. A detector is formed in a ring shape, disposed on a side adjacent to an outer circumference of the transmitting radio frequency coil, includes at least two PET detectors disposed with a space therebetween in an axial direction of a bore so as to interpose the magnetic field center of the static magnetic field therebetween, and detects gamma rays emitted from positron emitting radionuclides injected into the subject. Radio frequency shields are each formed in an approximately cylindrical shape, disposed between the transmitting radio frequency coil and the detector, and shield the radio frequency magnetic field generated by the transmitting radio frequency coil. | 09-12-2013 |
20130241555 | PET-MRI APPARATUS - In a PET (Positron Emission Tomography)-MRI (Magnetic Resonance Imaging) apparatus of an embodiment, a magnet that is a seamless structure generates a static magnetic field in a bore having a cylindrical shape. First detectors and second detectors are each formed in a ring shape and detect gamma rays emitted from positron emitting radionuclides injected into a subject. The first detectors and the second detectors are disposed with a space therebetween in an axial direction of the bore so as to interpose the magnetic field center of the static magnetic field therebetween. | 09-19-2013 |
20130296689 | PET-MRI APPARATUS - A PET-MRI apparatus according to an embodiment includes a static magnetic field magnet, a gradient coil, a high-frequency coil, an MR image reconstruction unit, a PET detector, and a PET image reconstruction unit. The high-frequency coil applies a high-frequency magnetic field to a subject placed in the static magnetic field and detects a magnetic resonance signal emitted from the subject in response to application of the high-frequency magnetic field and a gradient magnetic field. The PET detector has a ring shape and detects a gamma ray emitted from a positron-emitting radionuclide injected into the subject. The coil conductor of the high-frequency coil is made up of a first high-frequency shield that covers the outer surface of the PET detector. | 11-07-2013 |
20140021954 | MAGNETIC RESONANCE IMAGING APPARATUS AND RF COIL DEVICE - According to one embodiment, an MRI apparatus ( | 01-23-2014 |
20140062485 | MAGNETIC RESONANCE IMAGING APPARATUS AND RADIO COMMUNICATION DEVICE - According to one embodiment, an MRI apparatus ( | 03-06-2014 |
20140132266 | MAGNETIC RESONANCE IMAGING APPARATUS AND TRANSMISSION CONTROL METHOD - According to one embodiment, a magnetic resonance imaging apparatus provided with a plurality of transmission channels includes a signal processing unit and a control unit. The signal processing unit acquires a radio frequency magnetic field emitted from each of the plurality of transmission channels through a receiver coil mounted on an object and measure a phase of the radio frequency magnetic field. The control unit determines a phase difference between the plurality of transmission channels based on the phase of the radio frequency magnetic field of each of the plurality of transmission channels measured by the signal processing unit. The control unit controls a phase of a radio frequency pulse inputted to each of the plurality of transmission channels, based on the phase difference. | 05-15-2014 |
20140218035 | MAGNETIC RESONANCE IMAGING APPARATUS AND RF COIL DEVICE - According to one embodiment, an MRI apparatus ( | 08-07-2014 |
20140343400 | MEDICAL IMAGE DIAGNOSIS APPARATUS AND PET-MRI APPARATUS - A medical image diagnosis apparatus according to an embodiment includes: a first image taking unit, a second image taking unit, a position specifying unit, and a moving controlling unit. The first image taking unit performs an image taking process by implementing PET while using a first PET detector and a second PET detector. The position specifying unit specifies positions of the first PET detector and the second PET detector, on the basis of a medical image taken by the second image taking unit. The moving controlling unit controls moving of the first PET detector and the second PET detector in accordance with the specified positions. The first image taking unit and the second image taking unit each perform the image taking process after the first PET detector and the second PET detector have been moved. | 11-20-2014 |