Abstract: According to one embodiment, a magnetic resonance imaging apparatus includes processing circuitry. The processing circuitry generates, from a first image influenced by a magnetic field distortion, a second image in which the influence of the distortion is corrected, receives a first area setting in the second image and calculates, by a method of the calculation depending on an imaging purpose, an excitation area in the imaging based on the first area.

Abstract: According to one embodiment, a magnetic resonance imaging apparatus includes processing circuitry. The processing circuitry generates, from a first image influenced by a magnetic field distortion, a second image in which the influence of the distortion is corrected, receives a first area setting in the second image and calculates, by a method of the calculation depending on an imaging purpose, an excitation area in the imaging based on the first area.

Abstract: According to one embodiment, an MRI apparatus (10) includes a profile data generation unit (68) and a judging unit (65). The profile data generation unit generates a plurality of profile data that respectively correspond to a plurality of coil elements and indicate reception intensity distributions of nuclear magnetic resonance signals. The profile data are generated on the basis of the nuclear magnetic resonance signals from an object detected by the plurality of coil elements of each of a first RF coil device (100) and a second RF coil device (120). The judging unit judges at least one coil element effective for magnetic resonance imaging in each of the first RF coil device and the second RF coil device, by performing analysis of the plurality of profile data in which the first RF coil device and the second RF coil device are separately analyzed.

Abstract: A magnetic resonance imaging apparatus according to an embodiment includes: an obtaining unit, a correction coefficient deriving unit, an amplification degree deriving unit, and a filtering processing unit. The obtaining unit obtains a distribution of a radio frequency magnetic field. The correction coefficient deriving unit derives, on a basis of the distribution of the radio frequency magnetic field, a transmission correction coefficient used for correcting a transmission unevenness. The amplification degree deriving unit derives, for each of pixels, an amplification degree by which noise components are amplified in the image due to the correction, on the basis of either the distribution of the radio frequency magnetic field or the transmission correction coefficient. The filtering processing unit performs a filtering process according to the amplification degree on each of the pixels in the image to which the correction is applied.

Abstract: According to one embodiment, an MRI apparatus includes a data acquiring unit and processing circuitry. The data acquiring unit acquires MR signals for imaging according to data acquiring conditions for acquiring MR signals multiple times following one excitation. The data acquiring unit also acquires reference MR signals for phase correction of real space data for imaging. The real space data are generated based on the MR signals for imaging. The processing circuitry is configured to calculate a phase error, in a real space region, of reference real space data and generate MR image data based on the MR signals for imaging with the phase correction of the real space data for imaging based on the calculated phase error. The reference real space data are generated based on the reference MR signals. The real space region is determined based on conditions of acquiring the reference MR signals or the like.

Abstract: According to one embodiment, an MRI apparatus includes a data acquiring unit and processing circuitry. The data acquiring unit acquires MR signals for imaging according to data acquiring conditions for acquiring MR signals multiple times following one excitation. The data acquiring unit also acquires reference MR signals for phase correction of real space data for imaging. The real space data are generated based on the MR signals for imaging. The processing circuitry is configured to calculate a phase error, in a real space region, of reference real space data and generate MR image data based on the MR signals for imaging with the phase correction of the real space data for imaging based on the calculated phase error. The reference real space data are generated based on the reference MR signals. The real space region is determined based on conditions of acquiring the reference MR signals or the like.

Abstract: A magnetic resonance imaging apparatus according to an embodiment includes: an obtaining unit, a correction coefficient deriving unit, an amplification degree deriving unit, and a filtering processing unit. The obtaining unit obtains a distribution of a radio frequency magnetic field. The correction coefficient deriving unit derives, on a basis of the distribution of the radio frequency magnetic field, a transmission correction coefficient used for correcting a transmission unevenness. The amplification degree deriving unit derives, for each of pixels, an amplification degree by which noise components are amplified in the image due to the correction, on the basis of either the distribution of the radio frequency magnetic field or the transmission correction coefficient. The filtering processing unit performs a filtering process according to the amplification degree on each of the pixels in the image to which the correction is applied.

Abstract: According to one embodiment, an MRI apparatus (10) includes a profile data generation unit (68) and a judging unit (65). The profile data generation unit generates a plurality of profile data that respectively correspond to a plurality of coil elements and indicate reception intensity distributions of nuclear magnetic resonance signals. The profile data are generated on the basis of the nuclear magnetic resonance signals from an object detected by the plurality of coil elements of each of a first RF coil device (100) and a second RF coil device (120). The judging unit judges at least one coil element effective for magnetic resonance imaging in each of the first RF coil device and the second RF coil device, by performing analysis of the plurality of profile data in which the first RF coil device and the second RF coil device are separately analyzed.

Abstract: In a magnetic resonance imaging apparatus according to an embodiment, an array coil is structured by arranging a plurality of coil elements each of which receives a magnetic resonance signal generated from a subject. An acquisition controlling unit acquires the magnetic resonance signals while changing a position to be selected and excited within the subject who has the array coil attached thereon. A large-area image generating unit generates a large-area image of the subject, based on the magnetic resonance signals acquired by the acquisition controlling unit. A position measuring unit measures positions of the coil elements, based on strengths of the magnetic resonance signals used for generating the large-area image and positions of the couchtop corresponding to the times when the magnetic resonance signals were acquired.

Abstract: An MRI apparatus for performing an MRI examination to an object by sequentially applying an imaging method group, which is constituted by time-sequentially arranging a plurality of different imaging methods, to each of the imaging methods, has an imaging method group setting unit, a performing order setting unit and an imaging condition setting unit. The imaging method group setting unit sets the imaging method group. The performing order setting unit sets a performing order as a performing order of the imaging methods constituting the imaging method group. The imaging condition setting unit sets an imaging condition to each of the imaging methods.

Abstract: An MRI apparatus for performing an MRI examination to an object by sequentially applying an imaging method group, which is constituted by time-sequentially arranging a plurality of different imaging methods, to each of the imaging methods, has an imaging method group setting unit, a performing order setting unit and an imaging condition setting unit. The imaging method group setting unit sets the imaging method group. The performing order setting unit sets a performing order as a performing order of the imaging methods constituting the imaging method group. The imaging condition setting unit sets an imaging condition to each of the imaging methods.

Abstract: A diagnostic imaging system includes a scanner, a plurality of computers, and a control unit. The scanner scans a subject to obtain data. The control unit switches between a multiprocessing mode and a parallel processing mode, the multiprocessing mode allowing the same process in any of a medical-image forming process based on the data obtained and the subsequent processes to be executed by two or more computers of the plurality of computers, and the parallel processing mode allowing a plurality of different processes in the medical-image forming process and the subsequent processes to be executed concurrently by two or more computers of the plurality of computers.

Abstract: A liquid crystal power supply is provided which generates a high-precision drive power supply voltage supplied to a driver circuit by using a low-precision reference voltage generating circuit. The power supply circuit includes a DC/DC converter which generates a voltage having a size based on an oscillation signal from a power supply voltage and outputs the generated voltage as a drive power supply voltage; a stabilized power supply circuit which generates a highest-level reference potential for generating a gray-scale voltage in a driver circuit; a comparison unit which outputs a difference voltage according to a difference between the drive power supply voltage and the highest-level reference potential; an internal reference voltage generating unit; an error amplifying unit which amplifies a difference between the reference voltage and the difference voltage; and a PWM conversion unit which outputs an oscillation signal in response to the amplified difference.

Abstract: A display device capable of reducing screen flickering or flickers is dislcosed. More particularly, a technology for preventing an occurrence of flickers in the liquid-crystal display device of an active matrix type is disclosed. In a first frame, a drive voltage of a polarity determined in units of row based on a random number is applied. In a sequential second frame, a drive voltage of a polarity reverse to the polarity in the first frame is applied. The patterns of the polarities are alternately repeated.

Abstract: A liquid crystal power supply is provided which generates a high-precision drive power supply voltage supplied to a driver circuit by using a low-precision reference voltage generating circuit. The power supply circuit includes a DC/DC converter which generates a voltage having a size based on an oscillation signal from a power supply voltage and outputs the generated voltage as a drive power supply voltage; a stabilized power supply circuit which generates a highest-level reference potential for generating a gray-scale voltage in a driver circuit; a comparison unit which outputs a difference voltage according to a difference between the drive power supply voltage and the highest-level reference potential; an internal reference voltage generating unit; an error amplifying unit which amplifies a difference between the reference voltage and the difference voltage; and a PWM conversion unit which outputs an oscillation signal in response to the amplified difference.

Abstract: A voltage supply circuit includes transistors that are inserted between a plurality of output terminals. Reference voltages, required for respective nodes, are outputted by controlling the conductance of the transistors. Differential amplifier circuits are connected to the transistors, and outputs from the output terminals are inputted to the differential amplifier circuits. The differential amplifier circuits controls the conductance of the transistors based on differences between reference voltages and the outputs of the output terminals. Power to the differential amplifier circuits is supplied from the respective power source circuits, and is provided independently of the outputs from the transistors.

Abstract: The invention is intended to reduce the weight of the entire unit, make it compact and prevent the emitted light from being in dark and bright stripes in a light guide unit for a back light of a liquid crystal display device. Further, this invention allows a prism sheet having a larger apex angle to be used. To this end, the light guide unit comprises a plurality of light guide films laminated on the light guide member. The sloped surface which is opposite to the incident surface of the light guide unit is formed with grooves each having an inclination of an angle related to Brewster angle. A prism sheet is further disposed with the side having apexes oriented to the light guide unit to deflect the light emitted from the light guide unit.

Abstract: Abnormal states in a high-voltage cable connected to a backlight of a liquid crystal display are detected. This invention includes: a secondary winding of a transformer; a discharge tube connected to the secondary winding of the transformer; means connected to the discharge tube for detecting a tube current; means connected to the secondary winding of the transformer for detecting a transformer current; and abnormal-state detection means for comparing a value of the tube current detected by the tube current detection means with a value of the transformer current detected by the transformer current detection means and interrupting a power supply if a difference greater than a predetermined value is detected. Thus, a case of lighting delayed due to the darkness effect can also be dealt with.

Abstract: In order to detect a fault which would result in heating or fuming of a discharge tube lighting circuit and to break the lighting circuit, input voltage and current are measured and multiplied to compute the input power. The discharge tube 3 is extinguished when an input power reaches a predetermined value.

Abstract: A power supply apparatus which stabilizes the output by feeding it back is provided which suppresses variations of the output for abrupt variations of the input. The power supply apparatus comprises output sensing means for sensing output current and output voltage, first output control means for controlling the output with the increment or decrement of the value obtained from said output sensing means, second output control means for controlling the output from an absolute value of the input voltage, and selection means for selecting either said first output control means or said second output control means.