Patent application number | Description | Published |
20080231271 | Magnetic resonance imaging apparatus and magnetic resonance imaging method - An MRI apparatus includes an imaging signal acquisition unit, a motion signal acquisition unit, a motion amount determination unit, a motion correction unit and an image reconstruction unit. The imaging signal acquisition unit acquires MR signals as imaging signals. The motion signal acquisition unit repetitively acquires MR signals having PE amount less than that of the imaging signals as motion signals. The motion amount determination unit obtains a motion amount using the motion signals. The motion correction unit performs correction processing of the imaging signals in accordance with the motion amount. The image reconstruction unit reconstructs an image using the imaging signals after the correction processing. | 09-25-2008 |
20080238422 | Magnetic resonance imaging apparatus and magnetic resonance imaging method - A magnetic resonance imaging apparatus includes a data acquisition unit and an image data generating unit. The data acquisition unit acquires data according to a sequence derived by adding a coherent control pulse on a Steady-State Free Precession pulse sequence for repeating plural radio frequency excitations with a constant interval. The coherent control pulse has a center at a substantially center time between adjacent radio frequency excitations and a zero-order moment of which amount is zero. The image data generating unit generates image data based on the data. | 10-02-2008 |
20090134871 | MAGNETIC RESONANCE IMAGING APPARATUS AND MAGNETIC RESONANCE IMAGING METHOD - A magnetic resonance imaging apparatus includes a data acquisition unit and an image generating unit. The data acquisition unit acquires MR data according to an imaging condition for obtaining a SSFP in flowing matter by applying excitation pulses having a same flip angle with a constant TR and gradient magnetic fields to an object. The image generating unit generates an image of the flowing matter based on the MR data. | 05-28-2009 |
20090148021 | MAGNETIC RESONANCE IMAGING APPARATUS AND MAGNETIC RESONANCE IMAGING METHOD - A magnetic resonance imaging apparatus includes a data acquisition unit, a correction unit, a sorting unit and n image reconstruction unit. The data acquires data for imaging and projection data. The correction unit performs motion correction of the data using the breath levels obtained based on the projection data. The data sorting unit sorts the data after the motion correction into a cardiac time phase order based on electrocardiographic information. The image reconstruction unit reconstructs three dimensional image data based on the sorted data after the motion correction. | 06-11-2009 |
20090160440 | MAGNETIC RESONANCE IMAGING APPARATUS AND MAGNETIC RESONANCE IMAGING METHOD - A magnetic resonance imaging apparatus includes an input unit, a data acquisition unit and an image generating unit. The input unit inputs information indicating a matter of which resonance frequency is a center frequency of an excitation pulse. The data acquisition unit acquires magnetic resonance data with obtaining a steady state free precession. Each of the plural excitation pulses has a transmission phase varying by a variation amount determined based on a difference between a resonance frequency and the center frequency. The image generating unit generates an image of the desired matter based on the magnetic resonance data. | 06-25-2009 |
20090251143 | Magnetic resonance imaging apparatus and magnetic resonance imaging method - A magnetic resonance imaging apparatus includes a data acquisition unit and an image data generating unit. The data acquisition unit acquires data according to a sequence derived by adding a coherent control pulse on a Steady-State Free Precession pulse sequence for repeating plural radio frequency excitations with a constant interval. The coherent control pulse has a center at a substantially center time between adjacent radio frequency excitations and a zero-order moment of which amount is zero. The image data generating unit generates image data based on the data. | 10-08-2009 |
20090253984 | MEDICAL IMAGING METHOD AND MEDICAL IMAGING SYSTEM - In a medical imaging method of taking a tomographic image of a sample into which a contrast medium is injected by the use of a medical imaging system, a monitoring operation is performed on the sample into which the contrast medium is injected and then an imaging scan for reconstructing the tomographic image is performed. The monitoring operation is to repeat the steps of: (1) performing a monitoring scan for collecting data representing a concentration distribution of the contrast medium in a monitoring region of the sample, (2) reconstructing a reconstructed image representing the concentration distribution of the contrast medium in the monitoring region from the data acquired by the monitoring scan, (3) calculating a maximum signal value from a reconstructed image newly reconstructed and the reconstructed image previously reconstructed every pixel and generating a monitoring image including the maximum signal value calculated every pixel whenever the reconstructed image is newly reconstructed, and (4) monitoring whether a start time of the imaging scan comes in, until the start time comes in. | 10-08-2009 |
20110038520 | MAGNETIC RESONANCE IMAGING APPARATUS AND CONTROLLING METHOD THEREOF - In a magnetic resonance imaging apparatus according to the present embodiment, the sequence execution control unit alternately executes an imaging sequence of collecting data for generating a diagnostic image and a navigator sequence of collecting data for generating a navigator image that is an image for motion detection. The slice position detecting unit analyzes the navigator image generated from the data collected in the navigator sequence each time the navigator sequence is executed, and thereby detects the position of a mark indicating a slice excited by the imaging sequence executed prior to the navigator sequence. The respiratory motion estimating unit estimates the motion of a portion due to the subject's respiration, based on the detected position of the mark. | 02-17-2011 |
20120119740 | MAGNETIC RESONANCE IMAGING APPARATUS AND MAGNETIC RESONANCE IMAGING METHOD - According to one embodiment, a magnetic resonance imaging apparatus includes a spectrum acquisition unit, a resonance frequency acquisition unit and an imaging unit. The spectrum acquisition unit is configured to acquire frequency spectra of magnetic resonance signals from an object with changing a suppression effect or an enhancing effect of signals from a specific material. The resonance frequency acquisition unit is configured to obtain a resonance frequency of the specific material or another material based on an index representing a difference in intensities of signals from the specific material or the another material between the frequency spectra. The imaging unit is configured to perform imaging using a radio frequency pulse of which center frequency is set to the resonance frequency of the specific material or the another material. | 05-17-2012 |
20120187948 | MAGNETIC RESONANCE IMAGING APPARATUS - 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. | 07-26-2012 |
20120235676 | MAGNETIC RESONANCE IMAGING APPARATUS AND MAGNETIC RESONANCE IMAGING METHOD - According to one embodiment, a magnetic resonance imaging apparatus includes a data acquisition unit, an eddy magnetic field measuring unit and an imaging unit. The data acquisition unit is configured to acquire magnetic resonance signals at mutually different timings with applying a gradient magnetic field for generating an eddy magnetic field. The eddy magnetic field measuring unit is configured to acquire eddy magnetic field information including a time constant of the eddy magnetic field based on phase information of the magnetic resonance signals acquired at the timings. The imaging unit is configured to perform imaging under an imaging condition or a data processing condition according to the eddy magnetic field information. | 09-20-2012 |
20120313943 | IMAGE PROCESSING SYSTEM AND METHOD THEREOF - An image processing system according to an embodiment includes a first image creating unit, a second image creating unit, and a display controller. The first image creating unit creates a first image by performing a rendering processing on volume data which is three-dimensional medical image data. The second image creating unit creates a second image having a different stereoscopic effect from the first image by performing the rendering processing on the volume data. The display controller that controls to display the first image and the second image in a designated region that is designated in a display surface of a display unit and a background region other than the designated region, respectively. | 12-13-2012 |
20140117987 | MAGNETIC RESONANCE IMAGING APPARATUS AND MAGNETIC RESONANCE IMAGING METHOD - According to one embodiment, a magnetic resonance imaging apparatus includes a data acquiring unit and a data processing unit. The data acquiring unit is configured to acquire magnetic resonance signals according to an imaging condition for applying a first off-resonance radio frequency pulse after an application of an excitation pulse and before a readout of the magnetic resonance signals, and applying a second off-resonance radio frequency pulse after the readout of the magnetic resonance signals and before an application of a following excitation pulse. The first off-resonance radio frequency pulse generates a phase shift in the magnetic resonance signals. The second off-resonance radio frequency pulse compensates the phase shift. The data processing unit is configured to obtain information to be obtained by data processing of the magnetic resonance signals. | 05-01-2014 |