Kabushiki Kaisha Toshiba

Toshiba Medical Systems Corporation

Canon Medical Systems Corporation

Canon Medical Systems Coprporation

Naoyuki Furudate

Yutaka Machii

Sho Kawajiri

Motohiro Miura

Isao Tatebayashi

Naoyuki Takabayashi

Masaaki Umeda

Masaaki Nagashima

Satoshi Sugiura

Hiroshi Kusahara

Hiroki Kondo

Yuki Takai

Junichi Kachi

Ryohei Takayanagi

Sayo Syukuri

Yukihiko Tomoda

According to one embodiment, a magnetic resonance imaging apparatus includes a processing circuit. The processing circuit is configured to predict, based on an imaging sequence of magnetic resonance imaging and a relationship between a driving frequency of a gradient field coil and one of a magnet internal pressure and a magnet temperature of a static field magnet, the one of the magnet internal pressure and the magnet temperature at the time of execution of the imaging sequence, adjusts the imaging sequence based on a prediction result, and execute the adjusted imaging sequence.

Magnetic resonance imaging apparatus

A magnetic resonance imaging apparatus according to an embodiment includes processing circuitry configured, on a basis of one or both of (A) a parameter related to applying one of inversion and flip pulses and (B) an intensity of a slice selecting gradient magnetic field applied together with the one of the pulses in relation to selecting a slice to which the one of the pulses is applied, to determine one or both of (A) a parameter related to applying the other of the inversion and (B) flip pulses; and an intensity of the slice selecting gradient magnetic field applied together with the other of the pulses in relation to selecting a slice to which the other of the pulses is applied.

Magnetic resonance imaging apparatus, imaging parameter determining method, and non-volatile computer-readable storage medium storing therein imaging parameter determining program

A magnetic resonance imaging apparatus according to an embodiment includes a temperature sensor and a processing circuit. The temperature sensor acquires a temperature. The processing circuit calculates, based on information on an imaging sequence in which magnetic resonance imaging is to be performed, an estimated value of consumption energy of a gradient coil in a case when the imaging sequence is executed and calculates, based on the temperature acquired by the temperature sensor and the estimated value of the consumption energy, an estimated value of a temperature of the gradient coil, the temperature of the gradient coil undergoing changes as the imaging sequence is executed.

Magnetic resonance imaging apparatus and magnetic resonance imaging method

A magnetic resonance imaging apparatus includes a processor and a memory. The memory stores processor-executable instructions that, when executed by the processor, cause the processor to receive a breath holdable time of a subject and adjust a parameter value of an imaging parameter included in imaging condition for imaging of the subject, according to the breath holdable time.

Magnetic resonance imaging apparatus and console device thereof

According to one embodiment, a magnetic resonance imaging apparatus includes a gradient coil, power supply circuitry, and control circuitry. The gradient coil generates a gradient magnetic field. The power supply circuitry supply power to the gradient coil, the power being required by the gradient. The control circuitry temporarily change an upper limit value of power to be supplied by the power supply circuitry to a second value higher than a first value as a rated value based on the power required by the gradient coil.

Magnetic resonance imaging apparatus and gradient power supply apparatus

A magnetic resonance imaging apparatus according to an embodiment includes a processing circuit and a sequence control circuit. The processing circuit calculates, based on an imaging sequence to be executed in magnetic resonance imaging, a value of a current flowing through a closed circuit by using an equivalent circuit and determines, prior to an execution of the imaging sequence, based on the value of the current, whether it is acceptable to execute the imaging sequence. The sequence control circuit executes the imaging sequence. The equivalent circuit is an equivalent circuit for a circuit that includes a gradient coil and that has a first circuit and a second circuit. The first circuit is connected to a power supply and has self-inductance. The second circuit includes at least one closed circuit having mutual inductance with the first circuit.

Magnetic resonance imaging apparatus to calculate current in an equivalent circuit including a gradient coil

According to one embodiment, a magnetic resonance imaging apparatus includes a gradient magnetic field power supply, a voltmeter, and processing circuitry. The gradient magnetic field power supply includes an amplifier amplifying an input signal based on information of a gradient magnetic field waveform and outputting the amplified input signal to a gradient coil, a power supply device supplying power to the amplifier, and a capacitor bank supplying power, together with the power supply device, to the amplifier. The voltmeter measures a voltage of the capacitor bank. The processing circuitry calculates frequency characteristics of an impedance of the gradient coil, based on a voltage variation of the capacitor bank which was measured by the voltmeter, and controls imaging in accordance with the calculated frequency characteristics.

An MRI prep scan acquires plural sets of echo signals at a plurality of cardiac time phases which are mutually different from each other for each slice and used to generate a plurality of respectively corresponding prep images. Reference information is acquired and displayed for determining a first cardiac time phase and a second cardiac time phase on the basis of the prep images. The first and second cardiac time phases are set in response to an operator's specification. An imaging scan section for acquiring imaging echo signals by performing an imaging scan is performed upon each of the first and second cardiac time phases to acquire imaging echo signals. A first image is generated based on an echo signal of the first cardiac time phase and a second image is generated based on an echo signal of the second cardiac time phase. A differential image is acquired by calculating a difference between the first image and the second image.

Magnetic resonance imaging system and magnetic resonance imaging method

A magnetic resonance imaging apparatus according to an embodiment includes a controller and a generator. The controller divides a plurality of slice regions that are sequentially arranged into a first group including two non-sequential slice regions and a second group including a slice region positioned between the two non-sequential slice regions and acquires data from the slice regions for each of the groups. When acquiring data from at least one of the two non-sequential slice regions, the controller acquires the data after applying a pre-sat pulse to a position between the two non-sequential slice regions. When acquiring data from the slice region positioned between the two non-sequential slice regions, the controller acquires the data after applying a pre-sat pulse to a position of at least one of the two non-sequential slice regions.

A magnetic resonance imaging system is provided for obtaining MR images by scanning a region of the object previously located on an object's positioning image. The system comprises a displaying unit, inputting unit, approximating unit, and locating unit. The displaying unit displays a plurality of tomographic images of the object as the positioning image, each of the tomographic images including an indication of a target of interest thereon. The inputting unit enables information about a running state of the target in a direction along the target to be supplied toward each of the tomographic images. The approximating unit calculates three-dimensionally an approximated curve indicating the running state of the target in the direction on the basis of the supplied information about the running state. The locating unit locates the region substantially perpendicular to the approximated curve.

Magnetic resonance imaging using technique of positioning multi-slabs to be imaged

According to one embodiment, a magnetic resonance imaging apparatus includes an imaging condition setting unit and an imaging unit. The imaging condition setting unit is configured to display a setting screen of a radio frequency prepulse on a display unit to set imaging conditions including application timings of radio frequency prepulses according to input information from an input device through the setting screen. The setting screen displays an application timing of a radio frequency excitation pulse and the application timings of the radio frequency prepulses on a time axis. The imaging unit is configured to perform imaging of an object according to the imaging condition.

According to one embodiment, a magnetic resonance imaging apparatus includes an imaging condition setting unit, a verification image generating unit and an imaging unit. The imaging condition setting unit is configured to set an imaging condition for applying radio frequency pre-pulses to adjust a contrast. The radio frequency pre-pulses includes a region selective radio frequency pulse. The verification image generating unit is configured to generate and display an image for verifying the contrast based on application conditions including an application region and an application number of the radio frequency pre-pulses. The imaging unit is configured to perform magnetic resonance imaging according to the imaging condition.

Magnetic resonance imaging apparatus and magnetic resonance method

A Magnetic Resonance Imaging (MRI) apparatus according to an embodiment can execute a plurality of kinds of protocols varying in image contrast, and includes a storage unit and an output unit. The storage unit stores imaging conditions about the plurality of kinds of protocols. The output unit outputs onto a display unit an edit screen for receiving edit of a parameter that is an element of the imaging conditions. The edit screen is output by being separated into a common part that receives edit of parameter common to a plurality of kinds of protocols varying in image contrast, and an individual part that individually receives edit of parameter with respect to each protocol.

An operator designates a reference plane on a medical image or a region of a patient, and a setting unit specifies whether the reference plane is an axial plane, a sagittal plane, or a coronal plane. The setting unit also specifies vertical, horizontal, and anteroposterior directions on the reference plane based on an anatomical characteristic of the region. Information about relationship between a patient coordinate system and a region coordinate system is stored in association with the medical image in a first storage unit.

Growing community of inventors

Otawara, Japan

Naoyuki Furudate