Abstract: According to one embodiment, an MRI apparatus includes a data acquiring part and a data processing part. The data acquiring part acquires first and second MR signals by applying at least one IR pulse under an application condition according to a relaxation time of a fluid. The first MR signals include MR signals, having negative values, from the fluid. The second MR signals include MR signals, having positive values, from the fluid. The data processing part generates first and second image data. The first image data depict the fluid as a lower signal region than that of a tissue. The second image data depict the fluid as a higher signal region than that of the tissue. The data processing part generates the first image data with a phase correction based on the second MR signals.

Abstract: In one embodiment, an MRI apparatus includes: an MRI scanner configured to acquire N+1 or more diffusion-weighted images by differently setting parameter values among the diffusion-weighted images, with regard to N types of parameters, wherein N is a natural number equal to or more than two; and processing circuitry configured to generate a computed diffusion-weighted image having an arbitrary value for at least one of the N types of parameters, based on relationship between signal values of the acquired diffusion-weighted images and the parameter values differently set among the acquired diffusion-weighted images.

Abstract: A magnetic resonance imaging diagnostic apparatus includes a generating unit which generates a slice gradient magnetic field, a phase-encode gradient magnetic field and a read-out gradient magnetic field that extend in a slice axis, a phase-encode axis and a read-out axis, respectively, a setting unit which sets a dephase amount for weighting a signal-level decrease resulting from flows in the arteries and veins present in a region of interest of a subject, with respect to at least one axis selected form the slice axis, phase-encode axis and read-out axes, and a control unit which controls the generating unit by using a pulse sequence for a gradient echo system, which includes a dephase gradient-magnetic-field pulse that corresponds to the dephase amount set by the setting unit for the at least one axis.

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: A magnetic resonance imaging diagnostic apparatus includes a generating unit which generates a slice gradient magnetic field, a phase-encode gradient magnetic field and a read-out gradient magnetic field that extend in a slice axis, a phase-encode axis and a read-out axis, respectively, a setting unit which sets a dephase amount for weighting a signal-level decrease resulting from flows in the arteries and veins present in a region of interest of a subject, with respect to at least one axis selected form the slice axis, phase-encode axis and read-out axes, and a control unit which controls the generating unit by using a pulse sequence for a gradient echo system, which includes a dephase gradient-magnetic-field pulse that corresponds to the dephase amount set by the setting unit for the at least one axis.

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: According to one embodiment, an MRI apparatus includes a data acquiring part and a data processing part. The data acquiring part acquires first and second MR signals by applying at least one IR pulse under an application condition according to a relaxation time of a fluid. The first MR signals include MR signals, having negative values, from the fluid. The second MR signals include MR signals, having positive values, from the fluid. The data processing part generates first and second image data. The first image data depict the fluid as a lower signal region than that of a tissue. The second image data depict the fluid as a higher signal region than that of the tissue. The data processing part generates the first image data with a phase correction based on the second MR signals.

Abstract: A magnetic resonance diagnostic apparatus includes a derivation unit to derive an apparent diffusion coefficient regarding a pixel position for each pixel position included in a region of interest in at least two original images obtained by imaging a same imaging region of a same subject using at least two b-factors that are different from each other, respectively, based on pixel values of each of at least two original images regarding the pixel positions, and a first estimation unit to estimate a pixel value obtained by using a b-factor that is different from the at least two b-factors, regarding each pixel position included in the region of interest, based on the apparent diffusion coefficient derived for each pixel position.

Abstract: A magnetic resonance imaging apparatus according to an embodiment includes an execution unit and a generation unit. The execution unit executes first data collection of collecting a data after a predetermined inversion time elapses from a timing in which a labeling pulse is applied to a fluid flowing into an imaging region of a subject and a second data collection of collecting a data without the application of the labeling pulse. The generation unit generates a differential image by using the first data collected by the first data collection and the second data collected by the second data collection. Here, the generation unit generates the differential image by a different differential method according to a relation between the inversion time and a longitudinal relaxation time of the fluid.

Abstract: A magnetic resonance diagnostic apparatus includes a derivation unit to derive an apparent diffusion coefficient regarding a pixel position for each pixel position included in a region of interest in at least two original images obtained by imaging a same imaging region of a same subject using at least two b-factors which are different from each other, respectively, based on pixel values of each of at least two original images regarding the pixel positions, and a first estimation unit to estimate a pixel value obtained by using a b-factor which is different from the at least two b-factors, regarding each pixel position included in the region of interest, based on the apparent diffusion coefficient derived for each pixel position.

Abstract: A magnetic resonance diagnostic apparatus includes a derivation unit to derive an apparent diffusion coefficient regarding a pixel position for each pixel position included in a region of interest in at least two original images obtained by imaging a same imaging region of a same subject using at least two b-factors that are different from each other, respectively, based on pixel values of each of at least two original images regarding the pixel positions, and a first estimation unit to estimate a pixel value obtained by using a b-factor that is different from the at least two b-factors, regarding each pixel position included in the region of interest, based on the apparent diffusion coefficient derived for each pixel position.

Abstract: According to one embodiment, a magnetic resonance imaging apparatus includes an imaging unit and data processing condition setting unit. The imaging unit is configured to acquire magnetic resonance data corresponding to a sampling region asymmetric in a wave number direction in k-space from an object to generate image data based on the magnetic resonance data by data processing including phase correction and filter processing for obtaining a complex conjugate. The data processing condition setting unit is configured to set a condition for the data processing according to an imaging condition influencing a phase distribution used for the phase correction or the phase distribution.

Abstract: A magnetization vector is detected for each pixel position in an imaging region including at least part of a subject, the magnetization vector being excited to have a phase difference between a flow portion and a static portion or between a normal portion and an abnormal portion. A pixel value at each pixel position is determined as a value proportional to an absolute value of the amplitude of the magnetization vector detected for each of the pixel positions. On the basis of a real part or phase of the magnetization vector detected for each of the pixel positions, the determined pixel value is corrected so that the difference of the pixel value increases between (a) the flow portion or the abnormal portion and (b) the static portion or the normal portion.

Abstract: Provided is an MRI apparatus. In the MRI apparatus, a data collection unit repetitively performs a tag mode of applying an RF wave to at least an upstream portion of an imaging area to perform fluid labeling of a fluid flown into the imaging area and, after a lapse of an inversion time from application of the RF wave, performing magnetic resonance data collection, while changing the inversion time. An image reconstruction unit reconstructs a plurality of tag images corresponding to a plurality of different inversion times based on the magnetic resonance data collected in the tag mode. A reference image generation unit generates a reference image based on the plurality of the tag images. A fluid image generation unit generates a subtraction image between each of the tag images and the reference image as a fluid image.

Abstract: A magnetization vector is detected for each pixel position in an imaging region including at least part of a subject, the magnetization vector being excited to have a phase difference between a flow portion and a static portion or between a normal portion and an abnormal portion. A pixel value at each pixel position is determined as a value proportional to an absolute value of the amplitude of the magnetization vector detected for each of the pixel positions. On s the basis of a real part or phase of the magnetization vector detected for each of the pixel positions, the determined pixel value is corrected so that the difference of the pixel value increases between (a) the flow portion or the abnormal portion and (b) the static portion or the normal portion.

Abstract: An image data correcting device has a movement information acquiring section, a correcting section and a synthesizing section. The movement information acquiring section acquires movement information showing spatial distribution of the magnitude of a movement in the real space of an image pickup part of a detected body. The correcting section makes a correction different from that of a second area in a first area of image data collected by a scan of magnetic resonance imaging on the basis of the movement information. The synthesizing section synthesizes respective image data of the first area and the second area corrected by the correcting section.

Abstract: A magnetic resonance imaging (MRI) apparatus acquires magnetic resonance (MR) data associated with a plurality of different delay times according to a pulse sequence in which a region-selective saturation pulse is first applied, a region-non-selective inversion recovery pulse is then applied, and then the magnetic resonance data is acquired, the delay time being defined as a period from the saturation pulse application time to the start of MR data acquisition. A plurality of blood flow image data respectively associated with the plurality of different delay times are created using the acquired MR data.

Abstract: According to one embodiment, a magnetic resonance imaging apparatus includes a correction data acquisition unit configured to perform diffusion weighted imaging to a phantom having a known apparent diffusion coefficient and measure an apparent diffusion coefficient of the phantom to acquire correction data from a measured apparent diffusion coefficient and the known apparent diffusion coefficient, and an image generating unit configured to perform diffusion weighted imaging to an object with a same parameter setting as that of the diffusion weighted imaging to the phantom to generate an apparent diffusion coefficient image from a diffusion weighted imaging data of the object and the correction data.

Abstract: A data processing system configured to process acquired image data (e.g., as part of a diagnostic imaging apparatus) uses a signal-power estimating unit for estimating signal power by using reference data containing data different from processing-target data and a data processing unit for processing the processing-target data by using a WF (wiener_filter) based on the signal power estimated by the signal-power estimating unit.

Abstract: A data processing apparatus includes a SNR distribution data generating unit, a filter processing unit, a weighting function generating unit and a corrected data generating unit. The SNR distribution data generating unit generates SNR distribution data of processing target data based on the processing target data. The filter processing unit generates filter processed data obtained by performing filter processing to the processing target data to improve a SNR of the processing target data. The weighting function generating unit generates a weighting function based on the SNR distribution data. The corrected data generating unit generates corrected data by performing weighted calculation between the processing target data and the filter processed data using the weighting function.