Abstract: A magnetic resonance imaging apparatus according to a present embodiment includes a gradient magnetic field coil and a gradient magnetic field power supply. The gradient magnetic field coil applies gradient magnetic field to an object, the gradient magnetic field coil including a plurality of channels. The gradient magnetic field power supply calculates a required power for each channel, and distributes maximum power to a channel requiring higher power than the required power of other channels with priority to the other channels, the maximum power being a limit value of total power to be supplied to the channels as a whole.
December 1, 2016
Date of Patent:
October 20, 2020
TOSHIBA MEDICAL SYSTEMS CORPORATION
Motohiro Miura, Masashi Hori, Sho Kawajiri
Abstract: In one embodiment, a magnetic resonance imaging apparatus configured to sequentially execute plural imaging sequences includes: processing circuitry configured to calculate a predicted value of Long MR Examination specific absorbed energy which is an accumulated SAR (Specific Absorption Ratio) value over the plural imaging sequences; and a display configured to display information on the predicted value with respect to a predetermined safety reference value of the Long MR Examination specific absorbed energy.
Abstract: A magnetic resonance imaging apparatus according to an embodiment includes a processor and a memory. The memory stores processor-executable instructions that cause the processor to perform an application region scan for acquiring data on an area covering a diaphragm in order to position an application region of a motion detection pulse and a multi-slice scan for acquiring first multi-slice data on an area covering a heart; and acquire a slice image of the heart that is positioned using the first multi-slice data, with application of the motion detection pulse. In acquiring the slice image, when breathing motion of a subject is continuously out of an allowable range for a given period, the processor corrects a position of the application region by calculation using the second multi-slice data acquired by performing the multi-slice scan again and a positional relationship obtained by the application region scan and the multi-slice scan.
Abstract: When a group of (pre-processed) projection data is stored into a projection-data storage unit, a Gaussian-based expansion-data creating unit creates a group of Gaussian-based expansion data that is expanded from each of the group of projection data through linear combination based on a plurality of Gaussian functions that is stored by a Gaussian-function storage unit and has different center points. A reconstruction-image creating unit then creates a reconstruction image by using the Gaussian-based expansion-data created by the Gaussian-based expansion-data creating unit, and stores the created reconstruction image into an image storage unit.
Abstract: An MRI apparatus includes, a generating unit configured to generate radio frequency pulses applied in a pulse sequence; a sequence control unit configured to apply a radio frequency pulse related to acquisition of an image signal and a corrective radio frequency pulse during execution of one TR of a pulse sequence; and a calculation unit configured to measure the corrective radio frequency pulse and calculate a correction value for the radio frequency pulse. Based on the correction value, the generating unit corrects a radio frequency pulse related to acquisition of an image signal to be applied during a following TR later than a TR during which the corrective radio frequency pulse is measured.
Abstract: A magnetic resonance imaging apparatus according to an embodiment includes a dividing unit, an acquiring unit, and a combining unit. The dividing unit is configured to divide an imaging region of a patient into at least two temporal or spatial ranges. Of the temporal or spatial ranges, the acquiring unit is configured to perform a data acquiring process on a first range by using a first readout sequence and to perform a data acquiring process on a second range by using a second readout sequence that is different from the first readout sequence in terms of one or both of the type of sequence and an imaging condition. The combining unit is configured to combine an image generated from data acquired by using the first readout sequence with an image generated from data acquired by using the second readout sequence.
Abstract: According to one embodiment, an MRI apparatus includes a bed, a digital processing circuit, a first antenna, first radio communication circuitry, a second antenna, second radio communication circuitry, and an image reconstruction circuit. An object is loaded on the bed. The digital processing circuit is disposed inside the bed, acquires analogue MR signals from an RF coil which receives MR signals emitted from the object, and digitizes the acquired MR signals. The first radio communication circuitry wirelessly transmits the MR signals digitized by the digital processing circuit, by using the first antenna. The second radio communication circuitry wirelessly receives the MR signals wirelessly transmitted from the first antenna, by using the second antenna. The image reconstruction circuit reconstructs image data based on the MR signals received by the second radio communication circuitry.
Abstract: An image processing apparatus according to an embodiment includes processing circuitry. The processing circuitry is configured to obtain one or more complex product signal values each indicating a signal value of a complex product and a complex ratio signal value indicating a signal value of a complex ratio calculated in units of pixels by using first data and second data successively acquired by implementing a gradient echo method after an Inversion Recovery (IR) pulse is applied and to derive a T1 value of each of the pixels from one of the complex product signal values selected on the basis of the obtained complex ratio signal value.
Abstract: An image processing apparatus according to an embodiment includes conversion circuitry, magnitude image generating circuitry and phase image generating circuitry. The conversion circuitry is configured to convert time-series k-space data into first time-series x-space data, the x-space representing a spatial position. The magnitude image generating circuitry is configured to generate a magnitude image from second time-series x-space data, the second time-series x-space data being acquired by applying a first filter to the first time-series x-space data. The phase image generating circuitry is configured to generate a phase image from third time-series x-space data, the third time-series x-space data being acquired by applying, to the first time-series x-space data, a second filter that is different from the first filter.
Abstract: According to one embodiment, a gradient coil unit for a magnetic resonance imaging apparatus includes gradient coils for forming gradient magnetic fields in mutually orthogonal three axis directions. At least one of the gradient coils includes a conductor part along a coil pattern and a holding part holding the coil pattern. A passage of a coolant is formed inside at least one of the conductor part and the holding part. The passage has a non-constant cross section.
Abstract: A magnetic resonance imaging apparatus according to an embodiment includes a static field magnet, a gradient coil and a shim housing box. The static field magnet generates a static magnetic field in a space within a substantially cylindrical hollow. The gradient coil is provided inside the static field magnet and generates a gradient magnetic field. The shim housing box is capable of housing a metallic shim, the shim housing box being formed into a shape such that an attractive force of the static magnetic field applied to the shim housing box under magnetic excitation becomes smaller than a predetermined threshold.
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 gradient coil according to an embodiment includes a saddle coil conductor part that is formed of a conductive material to have a substantially cylindrical shape. The conductor part includes a first region on which a spiral shaped first pattern is formed and a second region on which a second pattern different from the spiral shaped first pattern is formed.
Abstract: A magnetic resonance imaging (MRI) system, method and/or computer readable medium is configured to effect improved parallel MR imaging with reduced unfolding artifacts by using either or both of: (a) an unfolded “intermediate” diagnostic image to create a more accurate mask for use in further processing raw image data for final unfolded diagnostic images; and/or (b) an extension of coil sensitivity maps by replication (rather than curve-fitted extrapolation) for use in final unfolding of diagnostic images.
Abstract: A magnetic resonance imaging apparatus according to an embodiment includes a processor and memory. The memory stores processor-executable instructions that, when executed by the processor, cause the processor to extract, based on a plurality of sagittal images at least including an intervertebral disk of a subject, an intervertebral disk region spanning across the plurality of sagittal images from spines visualized in the plurality of sagittal images; and set an imaging region of an intervertebral disk image based on the intervertebral disk region.
Abstract: A method and apparatus is provided to decompose spectral computed tomography (CT) projection data into material components using singles-counts and total-counts projection data. The singles-counts projection data more accurately solves the material decomposition problem, but can produce multiple results only one of which is correct. The total-counts projection data generates a unique result, but is less precise. The total-counts projection data is used to disambiguate the multiple results of the singles-counts projection data providing a unique results that is also precise.
Abstract: An image processing apparatus according to an embodiment includes processing circuitry. The processing circuitry is configured to detect a region of body fluid flowing in a subject from time-series images acquired by scanning an imaging area including a tagged region to which a tagging pulse is applied and imaging the imaging area; generate a plurality of display images in which the detected body fluid region is displayed in a display mode determined based on a positional relation between the body fluid region and a boundary line, the boundary line determined based on the tagged region; and output time-series display images including the plurality of display images to be displayed on a display.
Abstract: According to one embodiment, a position detection unit detects position information of an ultrasonic probe including ultrasonic transducers, with reference to a reference position. A transmission/reception unit supplies a driving signal to each transducer and generates a reception signal based on a reception echo signal generated by the transducer. Based on the reception signal, a three-dimensional data generation unit generates first three-dimensional data, in which a region corresponding to a living body tissue is specified by a specifying unit. A setting unit sets a first viewpoint based on the position information and specified region. An image generation unit generates a rendering image by rendering processing using the first viewpoint and first three-dimensional data.
December 14, 2012
Date of Patent:
October 29, 2019
TOSHIBA MEDICAL SYSTEMS CORPORATION
Go Tanaka, Kazutoshi Sadamitsu, Koichiro Kurita, Eiji Goto, Itsuki Kuga, Junho Cha
Abstract: A magnetic resonance imaging apparatus according to an embodiment includes a first acquiring unit, a second acquiring unit, and a combining unit. The first acquiring unit is configured to acquire data by executing a pulse sequence based on a first radio-frequency pulse transmission condition. The second acquiring unit is configured to acquire data by executing a pulse sequence based on a second radio-frequency pulse transmission condition that is different from the first radio-frequency pulse transmission condition. The combining unit is configured to perform a combining process either on the data acquired by the first acquiring unit and the data acquired by the second acquiring unit or on data obtained by reconstructing the data acquired by the first acquiring unit and data obtained by reconstructing the data acquired by the second acquiring unit.
Abstract: Magnetic resonance imaging (MRI) systems and methods to effect MRI data acquisition with reduced noise in fast spin echo (FSE) and spin echo (SE) implementations are described. The improved MRI data acquisition is performed by acquiring k-space data while maintaining a constant or near constant slice select gradient amplitude throughout a sequence kernel. The acquired k-space data can then be used to generate an MR image.