Abstract: Magnetic resonance imaging (MRI) systems and methods determine slice leakage and/or residual aliasing in the image domain in accelerated MRI imaging. Implementations process one slice of MRI image domain data by input to a sensitivity encoding (SENSE) un-aliasing matrix built from predetermined RF signal reception sensitivity maps, thereby producing as matrix output SENSE-decoded MRI image domain data for one pass through image slice and at least one extra slice, and determine inter-slice leakage and/or in-plane residual aliasing based on content of the at least one extra output slice from the SENSE-decoded MRI image domain data.
Abstract: In one embodiment, an ultrasonic diagnostic apparatus includes a probe configured to be equipped with plural transducers arranged in a first direction and a second direction perpendicular to the first direction and be able to perform a two-dimensional scan in the first and second directions; a moving device configured to support the probe and mechanically move the probe in the second direction; a receiving circuit configured to generate first reception signals for respective moving positions of the probe in the second direction by performing receiving phase-compensation and summation processing on respective reflected signals received by the plurality of transducers at each of the moving positions; and processing circuitry configured to generate a second reception signal by performing moving aperture synthesis on the first reception signals generated for the respective moving positions of the probe based on positional information of the probe and generate image data from the second reception signal.
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 detect cross-sectional positions of a plurality of cross-sectional images to be acquired in an imaging scan from volume data; acquire the cross-sectional images in sequence based on the cross-sectional positions by executing the imaging scan; and after the first cross-sectional image is acquired in the imaging scan, generate a display image, and display the display image on a display, the display image being an image in which a cross-sectional position of a second cross-sectional image which is detected from the volume data is superimposed on the first cross-sectional image, the second cross-sectional image being a cross-sectional image before being acquired and intersecting with the first cross-sectional image.
Abstract: A magnetic resonance imaging (MRI) apparatus according to an exemplary embodiment includes a sequence controller and a data processor. The sequence controller executes a pulse sequence using a combination of multiple types of labeling methods to acquire magnetic resonance signals. The data processor generates multiple types of labeled images based on the magnetic resonance signals.
Abstract: A magnetic resonance imaging apparatus includes a high-frequency coil and a coil supporting unit. The high frequency coil is disposed inside a gradient coil and that generates a high-frequency magnetic field in a static magnetic field. The coil supporting unit is formed with a substantially cylindrical shape and that supports the high-frequency coil. The coil supporting unit has a certain range including a magnetic field center and formed in parallel with an axial direction. Both ends of the coil supporting unit each have an internal circumference greater than the internal circumference of the certain range.
Abstract: According to one embodiment, an MRI apparatus includes a data acquisition unit and an image generation unit. The data acquisition unit acquires MR data from an object. The MR data correspond to a sampling region asymmetric in a wave number direction in a k-space. The image generation unit generates amplitude image data, in a real space, based on first k-space data after zero padding to a non-sampling region of the MR data and generates MR image data by data processing of the amplitude image data or convolution processing of the amplitude image data. The data processing converts the amplitude image data into second k-space data, performs filtering of the second k-space data and converts the second k-space data after the filtering into real space data. The convolution processing uses a function in the real space. The function is derived by converting a window function for the filtering.
Abstract: Embodiments and processes of computer tomography perform tasks associated with denoising a reconstructed image using an anisotropic diffusion filter and adaptively weighting an iterative instance of the diffused image based upon the product of a weight value and a difference between the iterative instance of the diffused image and the original image. In general, the adaptive weighting is a negative feedback in the iterative steps.
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: 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: 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: 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: 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: 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: 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, 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: 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.