Abstract: Provided is a magnetic resonance imaging (MRI) apparatus including an acquisition unit configured to acquire an undersampled spectrum in a k-space and a reconstruction unit configured to generate a target image based on the undersampled spectrum, wherein the reconstruction unit includes: a first sub-reconstruction unit configured to perform initial reconstruction on data corresponding to unsampled positions in the k-space by using a Split Bregman algorithm or approximate sparse coding; a second sub-reconstruction unit configured to decompose the initially reconstructed spectrum in the k-space into multiple frequency bands to thereby generate a plurality of individual spectra and perform dictionary learning reconstruction on images respectively corresponding to the decomposed multiple frequency bands by alternating sparse approximation and reconstructing of measured frequencies; and an image generator configured to generate a target image by merging together the reconstructed images respectively corresponding

Abstract: A magnetic resonance imaging (MRI) apparatus and a method of controlling the same is disclosed. The MRI apparatus includes a magnetic field generator configured to apply a magnetic field to a head of a subject; a radio frequency (RF) coil configured to apply a pulse to the head to which the magnetic field is applied, and to receive a signal generated in the head; and a processor configured to apply a first inversion recovery pulse to the head by the RF coil, when a magnitude of longitudinal magnetization of one of white matter (WM) and gray matter (GM) of the head is in a first range, suppress a recovery signal corresponding to the longitudinal magnetization of at least one of the WM and GM among recovery signals generated according to the first inversion recovery pulse; and generate a cerebrospinal fluid (CSF) image for at least one slice based on a signal at a point where a magnitude of transverse magnetization generated in the other of the WM and GM of the head is in a second range.

Abstract: A magnetic resonance imaging apparatus includes: a radio frequency (RF) controller configured to control a period of an RF pulse to be applied to an object for a time period that includes a first obtaining time, during which a first inversion RF pulse is applied, and a second obtaining time; and a signal transceiver configured to sequentially receive, during the first obtaining time, a first RF signal for generating a first fluid attenuated inversion recovery (FLAIR) image regarding a first slice of the object and a second RF signal for generating at least one magnetic resonance (MR) image regarding a second slice of the object.

Abstract: An MRI apparatus includes a data acquirer configured to under-sample MR signals, respectively received from channel coils included in a radio frequency (RF) multi-coil, at non-uniform intervals to acquire pieces of data set; and an image processor configured to restore pieces of K-space data respectively corresponding to the channel coils by using a positional relationship based on a spatial distance between a reference data set among the acquired pieces of data set and at least two of data set among the acquired pieces of data set, in a K-space.

Abstract: An MRI apparatus includes: a receive coil assembly including channels, and configured to receive an MR signal from an object; a data generator configured to generate undersampled image data on a k-space based on the MR signal; and a reconstructed image generator configured to generate a first reconstructed image from the undersampled image data using a parallel imaging method, and a second reconstructed image from the undersampled image data using compressed sensing. According to the MRI apparatus, since image reconstruction is performed using random undersampled image data, a parallel imaging method, and compressed sensing, it is possible to increase a speed of image acquisition and, at the same time, to improve the quality of images.

Abstract: Provided are an apparatus and method for sampling magnetic resonance (MR) signals received from each of a plurality of channel coils included in a radio frequency (RF) multi-coil such that intervals between two acquired signals that are adjacent in a first axis direction of a 3D K-space are non-uniform; and restoring an MR image by using the received MR signals.

Abstract: Provided is a magnetic resonance imaging (MRI) apparatus including: a controller configured to determine a first slice and a second slice so that a difference between a slice number of the first slice of an object and a slice number of the second slice of the object is a predetermined interval value; and a radio frequency (RF) coil configured to transmit a preparation pulse signal including a frequency component enabling the first slice to be excited and transmit an RF signal including a plurality of frequency components so that both the first slice and the second slice are excited.

Abstract: There are provided a magnetic resonance imaging device and a method of controlling a MRI device. The MRI device includes an RF transmitting coil configured to transmit an RF to an object on a table; an object scanning unit including a position detecting unit configured to detect a position of the object and a thickness detecting unit configured to detect a thickness of the object, and configured to recognize a body shape of the object; and a control unit configured to regulate the RF to be transmitted, thereby compensating an RF field based on the recognized body shape of the object.

Abstract: A magnetic resonance imaging (MRI) apparatus includes a radio frequency (RF) controller configured to, for a repetition time period, control the MRI apparatus to apply, to an object, an RF preparation pulse having a coverage area covering two or more slices among a plurality of slices of the object, control the MRI apparatus to apply, to the object, RF pulses respectively corresponding to the plurality of slices, and move the coverage area. The MRI apparatus further includes a data acquirer configured to acquire magnetic resonance signals from the plurality of slices during the repetition time period.

Abstract: Provided are a magnetic resonance (MR) image processing apparatus and a method of reconstructing a MR image. The MR image processing apparatus includes a processor and a memory connected to the processor, wherein the processor is configured to acquire a partially sampled multi-coil k-space with respect to an object and obtain a reconstructed image of the object by reconstructing the partially sampled multi-coil k-space based on a pre-acquired first dictionary and a second dictionary acquired by using the first dictionary.

Abstract: An MRI apparatus includes a data processor for obtaining first k space data including a first unacquired line by undersampling an MR signal based on a first value of an MR parameter, and for obtaining second k space data including a second unacquired line by undersampling an MR signal based on a second value of the MR parameter; and an image processor for interpolating a portion of first unacquired line data in the first k space data based on the second k space data, and a portion of second unacquired line data in the second k space data based on the first k space data.

Abstract: A magnetic resonance imaging (MRI) apparatus, including a processor and a memory connected to the processor, wherein the processor is configured to control a radio frequency (RF) coil to apply a first pulse sequence to a first slice from among a plurality of slices of an object during a first RR interval of a heart, and acquire a first magnetic resonance (MR) signal corresponding to the first pulse sequence from the RF coil, control the RF coil to apply a second pulse sequence to a second slice from among the plurality of slices during a second RR interval of the heart, and acquire a second MR signal corresponding to the second pulse sequence from the RF coil, reconstruct a first MR image from the first MR signal, and reconstruct a second MR image from the second MR signal.

Abstract: The MRI apparatus includes a data processor, which time-serially performs undersampling on MR signals respectively received by coil channels included in a radio frequency (RF) multi-coil to acquire undersampled K-t space data, and an image processor that acquires a time-space correlation coefficient, based on noise information of the coil channels, and restores pieces of unacquired line data from the undersampled K-t space data by using the time-space correlation coefficient to acquire restored K-t space data, thereby increasing an accuracy of the time-space correlation coefficient to improve a quality of an image.

Abstract: A magnetic resonance imaging (MRI) apparatus and method are provided. The MRI apparatus includes a first interpolator configured to generate a plurality of first interpolation data by performing calibration on a plurality of undersampled K-space data obtained from a plurality of channel coils in a radio frequency (RF) multi-coil, respectively, and a second interpolator configured to generate a plurality of second interpolation data by performing calibration on a plurality of filtered data obtained by filtering the first interpolation data using a plurality of high-pass filters.

Abstract: A magnetic resonance imaging (MRI) apparatus includes a radio frequency (RF) controller configured to, for a repetition time period, control the MRI apparatus to apply, to an object, an RF preparation pulse having a coverage area covering two or more slices among a plurality of slices of the object, control the MRI apparatus to apply, to the object, RF pulses respectively corresponding to the plurality of slices, and move the coverage area. The MRI apparatus further includes a data acquirer configured to acquire magnetic resonance signals from the plurality of slices during the repetition time period.

Abstract: A method and an apparatus are provided for reconstructing a plurality of magnetic resonance (MR) images of an object. The method includes synthesizing first MR images of the object to generate a synthesized first MR image, acquiring a k-space data set of the synthesized first MR image, and determining a weighting coefficient representing a relationship between the acquired k-space data set and a k-space data set of a respective one of the first MR images, for each of the first MR images. The method further includes obtaining a multi-band MR image of the object by applying a multi-band radio frequency signal to the object, and reconstructing second MR images from the obtained multi-band MR image, based on the determined weighting coefficient for each of the first MR images.

Abstract: A magnetic resonance imaging (MRI) apparatus, including a scanner configured to emit at least one radio frequency (RF) signal to an object during one repetition time (TR), and to receive echo signals emitted from the object; and a controller configured to transmit one or more control signals to the scanner to control the scanner, wherein the controller may be further configured to control the scanner to emit an RF excitation pulse and a refocusing pulse to the object during the one TR, control the scanner to receive a first echo signal corresponding to a first line of a k-space before an echo time (TE), and to receive a second echo signal corresponding to a second line of the k-space after the TE, and reconstruct a magnetic resonance (MR) image based on the k-space.

Abstract: Provided is a magnetic resonance imaging (MRI) apparatus including an acquisition unit configured to acquire an undersampled spectrum in a k-space and a reconstruction unit configured to generate a target image based on the undersampled spectrum, wherein the reconstruction unit includes: a first sub-reconstruction unit configured to perform initial reconstruction on data corresponding to unsampled positions in the k-space by using a Split Bregman algorithm or approximate sparse coding; a second sub-reconstruction unit configured to decompose the initially reconstructed spectrum in the k-space into multiple frequency bands to thereby generate a plurality of individual spectra and perform dictionary learning reconstruction on images respectively corresponding to the decomposed multiple frequency bands by alternating sparse approximation and reconstructing of measured frequencies; and an image generator configured to generate a target image by merging together the reconstructed images respectively corresponding

Abstract: Provided are an apparatus and method for sampling magnetic resonance (MR) signals received from each of a plurality of channel coils included in a radio frequency (RF) multi-coil such that intervals between two acquired signals that are adjacent in a first axis direction of a 3D K-space are non-uniform; and restoring an MR image by using the received MR signals.

Abstract: A magnetic resonance imaging apparatus includes: a radio frequency (RF) controller configured to control a period of an RF pulse to be applied to an object for a time period that includes a first obtaining time, during which a first inversion RF pulse is applied, and a second obtaining time; and a signal transceiver configured to sequentially receive, during the first obtaining time, a first RF signal for generating a first fluid attenuated inversion recovery (FLAIR) image regarding a first slice of the object and a second RF signal for generating at least one magnetic resonance (MR) image regarding a second slice of the object.