Patent application number | Description | Published |
20090171186 | MRI APPARATUS AND MAGNETIC RESONANCE IMAGING METHOD - An MRI apparatus acquires a blood signal about blood from a subject having the blood flowing from a first region to a second region via an imaging region. The apparatus includes a first longitudinal magnetization inverting device for inverting a longitudinal magnetization direction of the blood in the first region during a first inversion period, a second longitudinal magnetization inverting device that inverts a longitudinal magnetization direction of the blood in process of longitudinal magnetization recovery and inverts a longitudinal magnetization direction of tissues in the imaging region and the second region during a second inversion period after the first inversion period, and a data acquisition device that acquires a blood signal about blood flowing from the first region to the imaging region during a data acquisition period after the second inversion period. | 07-02-2009 |
20090221905 | MRI apparatus - An MRI apparatus for imaging a subject so as to emphasize, more than a background tissue, a bodily fluid flowing through an imaging region of the subject, the apparatus includes a transmission coil for transmitting an RF pulse to the subject, a first transmission coil control device for controlling the transmission coil so that the transmission coil transmits a first inversion pulse for inverting longitudinal magnetization components of the bodily fluid and the background tissue to negative values from the positive values, a second transmission coil control device for controlling the transmission coil so that the transmission coil transmits a second inversion pulse for inverting the longitudinal magnetization component of the background tissue to the positive value from the negative value inverted by the first inversion pulse, a third transmission coil control device for controlling the transmission coil so that the transmission coil transmits a third inversion pulse for inverting the longitudinal magnetization component of the background tissue to the negative value from the positive value inverted by the second inversion pulse and a fourth transmission coil control device for controlling the transmission coil so that the transmission coil transmits an excitation pulse for acquiring data about the bodily fluid. | 09-03-2009 |
20100198046 | MAGNETIC RESONANCE IMAGING APPARATUS AND PROGRAM - A magnetic resonance imaging apparatus includes a gradient coil for applying a gradient pulse, a transmitting coil for transmitting an RF pulse, and a coil control device for controlling the gradient coil and the transmitting coil in such a manner that a pulse sequence for (A) making an absolute value of longitudinal magnetization of a first background tissue and an absolute value of longitudinal magnetization of a second background tissue longer in T1 value than the first background tissue smaller than an absolute value of longitudinal magnetization of body fluid of a subject, (B) acquiring magnetic resonance signals from the subject, and (C) flipping transverse magnetization of the second background tissue to longitudinal magnetization is repeatedly executed. | 08-05-2010 |
20100219830 | MAGNETIC RESONANCE IMAGING APPARATUS, METHOD AND PROGRAM OF MAGNETIC RESONANCE IMAGING - A magnetic resonance imaging apparatus includes a gradient coil, a transmission coil, an electrocardiographic signal detecting device detecting an electrocardiographic signal from a subject, a controlling device controlling the gradient coil and the transmission coil so that a pulse sequence including a preparation pulse and a data acquisition sequence for acquiring data from a subject utilizing a magnetic resonance phenomenon is repeatedly carried out, and a cardiac phase computing device computing the cardiac phase of the subject based on the electrocardiographic signal. The controlling device determines whether or not to re-acquire data once acquired from the subject based on the cardiac phase of the subject at an arbitrary time in a period during which the pulse sequence is carried out or the cardiac phase of the subject at a time after the pulse sequence is terminated. | 09-02-2010 |
20110074412 | MAGNETIC RESONANCE IMAGING APPARATUS AND METHOD - A magnetic resonance imaging apparatus includes z segments which divide a ky-kz plane. The z segments includes data located therein. The ky-kz plane is divided into z center-in regions and z center-out regions by a plurality of lines extending radially from a center of the ky-kz plane. The z center-in regions have data located therein in accordance with first trajectories which proceed toward the center of the ky-kz plane. The z center-out regions have data located therein in accordance with second trajectories which proceed in a direction spaced away from the center of the ky-kz plane. Each of the z segments has one center-in region of the z center-in regions and one center-out region of the z center-out regions. Each of the z segments is defined in which after data have been located in said one center-in region in accordance with the first trajectory, data are located in said one center-out region in accordance with the second trajectory. At least one of the z segments is defined in which an angle of said one center-in region at the center of the ky-kz plane is wider than an angle of said one center-out region at the center of the ky-kz plane. | 03-31-2011 |
20120161765 | MAGNETIC RESONANCE IMAGING APPARATUS AND METHOD - A magnetic resonance imaging apparatus configured to carry out a pulse sequence in synchronization with a biosignal is provided. The pulse sequence includes an RF pulse, and a data acquisition sequence for acquiring data when a wait time has passed after the RF pulse, wherein the wait time has a variable value that can be varied based on the biosignal. | 06-28-2012 |
20130027036 | MAGNETIC RESONANCE IMAGING APPARATUS AND METHOD - A magnetic resonance imaging apparatus configured to carry out a pulse sequence in synchronization with a biosignal is provided. The pulse sequence includes an RF pulse, and a data acquisition sequence for acquiring data when a wait time has passed after the RF pulse, wherein the wait time has a variable value that can be varied based on the biosignal. | 01-31-2013 |
20130053685 | MAGNETIC RESONANCE SYSTEM AND PROGRAM - A magnetic resonance system is provided. The magnetic resonance system includes a unit configured to acquire magnetic resonance signals from a region including liquid in a subject using a first sequence having a flow compensation gradient field for changing a phase of a spin according to a flow rate, and acquire magnetic resonance signals from the region using a second sequence free of the flow compensation gradient field. The magnetic resonance system further includes a biological signal generating unit configured to generate biological signals of the subject, based on the magnetic resonance signals acquired by the first sequence and the magnetic resonance signals acquired by the second sequence. | 02-28-2013 |