Patent application number | Description | Published |
20100119136 | MAGNETIC RESONANCE IMAGING APPARATUS AND IMAGE CLASSIFICATION METHOD - A plurality of images obtained by multi-station imaging are classified. | 05-13-2010 |
20100260403 | MAGNETIC RESONANCE IMAGING APPARATUS AND MAGNETIC RESONANCE IMAGING METHOD - An image in which an area of interest on an image is optimally susceptibility-emphasized is obtained in susceptibility-emphasized imaging. A measuring order of plural echo signals is controlled in accordance with the size of a desired area of interest of an examinee. Preferably, a target frequency in a K space is determined in accordance with the size of the area of interest, and the measuring order of plural echo signals is controlled so that an echo signal corresponding to the target frequency is measured at a target echo signal or in the neighborhood of the target echo time. | 10-14-2010 |
20100290682 | Magnetic Resonance Imaging Apparatus - An imaging pulse sequence includes; a tagging sequence for modulating nuclear magnetization of an object to be imaged; and an imaging sequence for non-measurement of a part of k-space data. | 11-18-2010 |
20110074418 | MAGNETIC RESONANCE IMAGING APPARATUS AND METHOD OF ASSISTING SETTING OF IMAGING PARAMETER - An object is to enhance usability of parameter check when an imaging parameter is changed in multistation imaging, and easily obtain a desired image with high quality. In the multistation imaging, it is determined in a lump before imaging whether an image having desired quality is obtained by using the changed value of the imaging parameter, and the result is presented to an operator. The determination is executed in the order of “possible or impossible” determination of execution of imaging itself and “possible or impossible” determination of combination of obtained images. When it is determined that it is impossible to execute the imaging itself, the determination processing is finished. At this time, a recommended value may be presented. | 03-31-2011 |
20110237931 | MAGNETIC RESONANCE IMAGING APPARATUS AND SYNCHRONOUS IMAGING METHOD - An imaging time is shortened by maintaining a desired image contrast in imaging synchronized with the periodic body movement information regarding the subject. In order to do so, in synchronous measurement of an echo signal synchronized with the trigger information detected from the periodic body movement information regarding the subject with periodic body movement, at least one of a first period before a measurement period of an echo signal and a second period after the measurement period of the echo signal is set, a K space is divided into a plurality of partial regions, and at least one of the first and second periods is set to be different in measurement of an echo signal corresponding to a partial region at a low spatial frequency side and measurement of an echo signal corresponding to a partial region at a high spatial frequency side. | 09-29-2011 |
20120093384 | MAGNETIC RESONANCE IMAGING APPARATUS AND IMAGING SLICE DETERMINATION METHOD - In order to provide a technique for accurately realizing an examination, which is for acquiring a plurality of images of the same examination section, without a complicated operation and an extension of an examination time, body movement information of a subject is acquired immediately before each imaging in an examination, and it is determined whether or not there is a change in the position of the subject by comparing it with body movement information immediately before reference imaging. Only when there is a change in the position of the subject, an imaging slice setting image is acquired again. Then, a recommended imaging slice is calculated using the newest imaging slice setting image. | 04-19-2012 |
20120176132 | MAGNETIC RESONANCE IMAGING APPARATUS AND IRRADIATION FREQUENCY ADJUSTING METHOD - A high-quality image is obtained using a two-dimensional selective excitation method even if the static magnetic field is not uniform. Therefore, non-uniformity of a static magnetic field of a region to be focused in particular in a selective excitation region excited by 2DRF is measured, and a result of the measurement is reflected in an imaging sequence using the 2DRF. For example, a resonance frequency of magnetization obtained from the measurement result is set as an irradiation frequency of the 2DRF. In addition, a shim gradient magnetic field is applied so as to correct the non-uniformity of the magnetization obtained from the measurement result. These are applied only in the imaging sequence using the 2DRF, and an irradiation frequency and a shim gradient magnetic field set in a conventional method are used in other imaging sequences. | 07-12-2012 |
20120194190 | MAGNETIC RESONANCE IMAGING APPARATUS AND METHOD FOR ADJUSTING EXCITATION REGION - In imaging using 2-dimensional selective excitation pulses, regardless of applications thereof, a technique for obtaining a high quality image is provided. | 08-02-2012 |
20120212223 | MAGNETIC RESONANCE IMAGING APPARATUS AND TWO-DIMENSIONAL EXCITATION ADJUSTMENT METHOD - An MRI apparatus and a two-dimensional excitation adjustment method capable of performing appropriately two-dimensional excitation of a region, in which materials with different resonance frequencies are present, according to imaging conditions are provided. In order to do so, when performing the two-dimensional excitation of a two-dimensional excitation region of an object formed by a first material with a first resonance frequency and a second material with a second resonance frequency, an irradiation frequency of a high-frequency magnetic field for the two-dimensional excitation is set on the basis of the imaging conditions related to the two-dimensional excitation and the first and second resonance frequencies so that desired regions of the first and second materials are excited in a two-dimensional manner. | 08-23-2012 |
20120281901 | MAGNETIC RESONANCE IMAGING APPARATUS AND BLOOD VESSEL IMAGE CAPTURING METHOD - In order to acquire a non-contrast MRA image in which blurring of the blood vessel is suppressed to improve the visualization ability even if there is an influence of T2 attenuation in echo data, the imaging sequence for measuring the echo data along the measurement trajectories non-parallel to two directions perpendicular to the readout direction in the three-dimensional K space is executed in synchronization with the periodic body motion information of an object. In this case, the repetition time (TR) of the imaging sequence is set to be a plurality of periods of the periodic body motion information. | 11-08-2012 |
20130034287 | MAGNETIC RESONANCE IMAGING APPARATUS AND BLOOD VESSEL IMAGE CAPTURING METHOD - There is provided an MRI apparatus and a blood vessel image capturing method capable of improving the separability of an artery and a vein. In order to do so, using an imaging sequence obtained by combining a first sequence portion for measuring a first echo signal used for acquisition of a blood vessel image of a desired region of an object with a second sequence portion for measuring a second echo signal used for acquisition of blood flow information of the object, the object is imaged by one examination scan. In addition, blood flow information is acquired using the second echo signal, and at least one of an artery and a vein is extracted in an image, which is reconstructed using the first echo signal, using the acquired blood flow information. | 02-07-2013 |
20130106417 | MAGNETIC RESONANCE IMAGING APPARATUS AND RF PULSE CONTROL METHOD | 05-02-2013 |
20130265053 | MAGNETIC RESONANCE IMAGING APPARATUS, AND IMAGING PARAMETER OPTIMIZING METHOD - Disclosed is a technique which allows easy optimization of imaging conditions in imaging using two-dimensional excitation as a pre-pulse. To this end, a parameter which specifies the excitation region of the two-dimensional excitation is shifted, a value (optimum value) when a predefined index is ideal for each application to be applied is decided in a subsequent main imaging sequence, and the optimum value is set to the value of the parameter, whereby optimization is performed. A two-dimensional excitation pre-pulse which is excited under optimum excitation conditions is used to optimize the parameter in the main imaging sequence. | 10-10-2013 |
20130266199 | MAGNETIC RESONANCE IMAGING APPARATUS AND FLUID IMAGING METHOD - In imaging for labeling only the fluid of a specific region, a high-quality image is acquired in a short time. In order to achieve this, the optimal number of segments N is determined from the flow velocity V and the size φ of a specific region to be labeled when performing imaging by labeling only the fluid of the specific region using a two-dimensional selective excitation pulse as a pre-pulse. In addition, the k-space ordering is determined according to the arrival timing of the fluid to the imaging region. In addition, the optimal flip angle (FA) is determined depending on the type of pre-pulse. | 10-10-2013 |
20140132268 | MAGNETIC RESONANCE IMAGING APPARATUS AND IMAGING POSITION SETTING ASSISSTING METHOD - In order to provide a magnetic resonance imaging apparatus capable of maximizing the effect of an automatic positioning function without increasing the load on an operator even in imaging of an examination part having a plurality of examination sections, when setting an imaging position of an examination part having a plurality of examination sections, automatic positioning processing for automatically detecting all examination sections of the examination part on a scanogram image acquired in advance is performed first. A stack is displayed at a position, which is detected by this automatic positioning processing, on the scanogram image. | 05-15-2014 |
20140327440 | MAGNETIC RESONANCE IMAGING APPARATUS AND REGION-IMAGING METHOD - In order to reduce image quality deterioration due to static magnetic field inhomogeneity according to imaging conditions without increasing an operator workload, shimming current where static magnetic field inhomogeneity of a selected region is reduced is calculated, shimming is performed for the selected region using the calculated local Bo shimming current, and then an increment (RF-Phase) in an irradiation phase of an RF pulse that excites the selected region in a state where static magnetic field inhomogeneity of the selected region is reduced or a post-adjustment excitation frequency (f0′) that is an excitation frequency is calculated. These increments (RF-Phase) in an irradiation phase and post-adjustment excitation frequency (f0′) that is an excitation frequency correspond with each other in amount. | 11-06-2014 |