Kabushiki Kaisha Toshiba

Canon Medical Systems Corporation

Toshiba Medical Systems Corporation

Hiroshi Takai

Nobuyuki Konuma

Kensuke Shinoda

Yoshimori Kassai

Hitoshi Kanazawa

Kazuya Okamoto

Shuhei Nitta

Kazuto Nakabayashi

Nobuyasu Ichinose

Yuichi Yamashita

Naho Imamura

Mitsue Miyazaki

Takahiro Ohmure

Masahito Nambu

Yoshiteru Watanabe

Yoshinari Morita

Kazuya Tanoue

Masaaki Nagashima

Takashi Shigeta

Junichi Kachi

Takahiro Tamura

A medical information processing apparatus according to an embodiment includes processing circuitry. The processing circuitry calculates noise intensity from first data acquired during a first scan. The processing circuitry calculates a denoising intensity used for a denoising process based on the noise intensity and the difference between an imaging condition for the first scan and an imaging condition for a second scan, the denoising process being applied to second data obtained by the second scan.

Medical information processing apparatus and medical information processing method

According to one embodiment, a medical information processing apparatus includes processing circuitry configured to derive an index value with respect to noise included in data associated with magnetic resonance signals collected by each of a plurality of reception coils, adjust a degree to which noise is removed from the data associated with the magnetic resonance signals based on the derived index value, remove noise from the data associated with the magnetic resonance signals based on the adjusted degree, and perform compositing of the data associated with the magnetic resonance signals from which noise has been removed.

Medical information processing apparatus, medical information processing method, and storage medium

A medical image processing apparatus of embodiments includes processing circuitry. The processing circuitry is configured to acquire a data and a g-factor map. The data is generated as a result of a reception by an RF coil. The processing circuitry is configured to determine strength of denoise performed on the data on the basis of the g-factor map and perform the denoise on the data.

Medical information processing apparatus, magnetic resonance imaging apparatus, and medical information processing method

An image reconstruction method according to an embodiment includes: collecting first k-space data at a first time and second k-space data having an undersampled pattern different from an undersampled pattern of the first k-space data at a second time different from the first time; generating intermediate data by converting data including the first k-space data and the second k-space data; generating, by inversely converting the intermediate data, third k-space data and fourth k-space data that correspond to the first k-space data and the second k-space data, respectively, and in each of which at least part of a region undersampled through the corresponding undersampled pattern is filled; and generating a magnetic resonance image at a time different from any of the first time and the second time by converting k-space data obtained by combining at least part of the third k-space data and at least part of the fourth k-space data.

Image reconstruction method

According to one embodiment, a magnetic resonance imaging apparatus includes processing circuitry. The processing circuitry acquires a first resonance frequency distribution of a first tissue and a second resonance frequency distribution of a second tissue which is different from the first tissue. The processing circuitry calculates a center frequency of a frequency-selective pulse that suppresses or emphasizes either one of the first tissue and the second tissue in accordance with the first and second resonance frequency distributions. The processing circuitry collects a magnetic resonance signal after the frequency-selective pulse is applied at the calculated center frequency.

Magnetic resonance imaging apparatus and magnetic resonance imaging method

According to one embodiment, a magnetic resonance imaging apparatus includes processing circuitry. The processing circuitry calculates a static magnetic field correction amount based on a static magnetic field distribution of a first imaging range narrower than a second imaging range. The processing circuitry collects a magnetic resonance (MR) image of the second imaging range under a static magnetic field which is corrected based on the static magnetic field correction amount. The processing circuitry corrects distortion of the collected MR image.

Magnetic resonance imaging apparatus and magnetic resonance imaging method for correcting distortion of a collected magnetic resonance image

An MRI apparatus includes imaging control circuitry that performs shimming imaging for collecting a first MR signal, and multi-slice imaging for collecting a second MR signal along with radiation of a non-region-selective prepulse, and processing circuitry that generates static magnetic field distributions of the slices, determines a first center frequency of an RF pulse corresponding to each slice and a second center frequency of the prepulse based on the static magnetic field distribution, and determines an order of slices for collecting the second MR signal in accordance with the first and/or second center frequencies, wherein the imaging control circuitry performs the multi-slice imaging in accordance with the order and the first and second center frequencies.

Magnetic resonance imaging apparatus and multi-slice imaging method

A magnetic resonance imaging apparatus according to the present embodiment includes sequence control circuitry. The sequence control circuitry collect first MR data in a first cardiac cycle by excitation of a first region including a first slice, and collects reference data used for phase correction of second MR data on a second slice not included in the first region before and after the collection of the first MR data in the first cardiac cycle.

A magnetic resonance imaging apparatus includes an interface, processing circuitry, and imaging control circuitry. The interface inputs, to a locator image, a position-indicating region indicating a position in a displayed cross section. The processing circuitry determines a collection direction relating to multi-slice imaging based on a static magnetic field distribution relating to the position-indicating region and the position-indicating region. The imaging control circuitry performs the multi-slice imaging in the collection direction to a plurality of slices in an imaging region which includes at least the position-indicating region.

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.

Magnetic resonance imaging apparatus and magnetic resonance imaging method for correcting transmission unevenness due to RF pulse

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.

A magnetic resonance imaging system uses a first RF coil for acquiring a magnetic resonance signal from a subject, and a device for estimating a cardiac phase of the subject based on the magnetic resonance signal acquired by the first RF coil. The first RF coil, for example, can be an RF coil exclusive to cardiac phase estimation. The magnetic resonance imaging system also uses a second RF coil for acquiring a magnetic resonance signal based on the estimated cardiac phase, and a device for reconstructing a magnetic resonance image of the subject based on the magnetic resonance signal acquired by the second RF coil. Thus, MRA can be performed by estimating a cardiac phase.

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Nasushiobara, Japan

Hiroshi Takai