Patent classifications
G01R33/4838
Method and system of automatic selection for the suppression of a tissue component
In a method for automatic control of an examination sequence in magnetic resonance (MR) system during recording of MR signals in an examination segment of a person being examined, which has two tissue components with two different MR resonant frequencies, an examination sequence for examination of the examination segment is determined. Further, whether the examination sequence includes an imaging sequence in which one of the two tissue components is to be suppressed and for which at least two different suppression options exist to reduce the one of the two tissue components during the recording of the MR signals is determined. In response to the determination that the examination sequencing included the imaging sequence, the method can include determining a sequence parameter of the examination for the imaging sequence; and selecting one of the at least two suppression options as a function of the sequence parameter determined for the imaging sequence.
Saturation-prepared recording of MR image data
A method is provided for the saturation-prepared recording of MR image data. The method includes establishment of at least two measurement slices in an examination volume of an examination object, wherein the examination volume has adjacent slices which each adjoin at least one of the at least two measurement slices; output of a saturation module including at least one saturation pulse for saturating a magnetization of the adjacent slices; output of an excitation pulse for exciting a magnetization of at least one of the at least two measurement slices; readout of an MR signal of the examination volume; reconstruction of the MR image data from the at least two measurement slices based on the MR signal; and provision of the MR image data. The disclosure further relates to a magnetic resonance system and a computer program product.
Correction of TOF MR data
A method for correcting TOF MR data, including providing a coil sensitivity map for an examination region of an examination object, providing the TOF MR data of the examination region, and generating corrected TOF MR image data comprising multiplying the TOF MR data by an inverse of the coil sensitivity map.
MAGNETIC RESONANCE IMAGING APPARATUS AND MAGNETIC RESONANCE IMAGING METHOD
A magnetic resonance imaging apparatus includes sequence controlling circuitry and processing circuitry. The sequence controlling circuitry executes (i) a first pulse sequence in which a spatially selective Inversion recovery (IR) pulse and a spatially non-selective IR pulse are applied, and (ii) a second pulse sequence in which the spatially non-selective IR pulse is applied without applying the spatially selective IR pulse, while varying the first TI period, with respect to a plurality of first TI periods. The sequence controlling circuitry executes (iii) the third pulse sequence in which the spatially selective IR pulse and the spatially non- selective IR pulse are applied, and (iv) the fourth pulse sequence in which the spatially non-selective IR pulse is applied without applying the spatially selective IR pulse. The processing circuitry generates a magnetic resonance image of an imaged region based on data obtained from the third pulse sequence and the fourth pulse sequence.
Excitation region setting method and magnetic resonance imaging apparatus
An excitation region setting method according to an embodiment includes: receiving a designation of a first region from a user, the first region being designated in a distortion-corrected image that is a magnetic resonance image in which an effect of a distortion of a magnetic field has been corrected; calculating an actual excitation region where a subject is to be excited, based on the designated first region and the effect of the distortion of the magnetic field; and correcting imaging conditions including at least one of an orientation of a slice plane that defines the actual excitation region, or a frequency of a high-frequency magnetic field applied to the subject, in such a manner that the calculated actual excitation region becomes closer to an ideal excitation region represented as the first region.
MAGNETIC RESONANCE APPARATUS
A magnetic resonance imaging apparatus comprises a scanning unit for performing a pulse sequence PS including a MT (Magnetization Transfer) pulse b for lessening signals from the cerebral parenchyma (white matter and gray matter). The scanning unit performs the pulse sequence PS in periods of time P1 and P3 in the pulse sequence PS so that the MT pulse b is applied every repetition time TR, while it performs the pulse sequence PS in a period of time P2 in the pulse sequence PS so that no MT pulse b is applied.
Reduced Field-of-View Perfusion Imaging With High Spatiotemporal Resolution
Some aspects of the present disclosure relate a method for magnetic resonance imaging, which can include acquiring, by applying an imaging pulse sequence, magnetic resonance data associated with a region of interest of a subject. The imaging pulse sequence can include a plurality of RF pulses configured to generate a desired image contrast, and an outer-volume suppression (OVS) module to attenuate the signal outside the region of interest. The method can further include reconstructing, from the acquired magnetic resonance data, a plurality of reduced field of view (rFOV) magnetic resonance images corresponding to the region of interest.
Magnetic resonance imaging apparatus and magnetic resonance imaging method
An IR pulse is applied to a tag region B that is disposed at the upstream side of the ascending aorta relative to a tag region A at a timing with a second predetermined delay time TD2 (for example, 600 ms) from the application time of an IR pulse to the tag region A to thereby perform tagging. By this tagging, it is possible to suppress the MR signals derived from the substantial portions and the blood within the tag region B. Subsequently, an imaging scan is performed after a predetermined time lapse TIA (for example, 1200 ms) from the application time of the IR pulse to the tag region A or after a predetermined time lapse TIB (for example, 600 ms) from the application time of the IR pulse to the tag region B.
Method and apparatus for magnetic resonance imaging
In a method and apparatus for magnetic resonance imaging, in order to enable improved saturation of magnetic resonance signals during an acquisition sequence, the acquisition sequence includes a readout block set with multiple readout blocks, a readout saturation pulse set with multiple readout saturation pulses, and an intermediate saturation pulse set with one or more intermediate saturation pulses, wherein the readout saturation pulse set is disjoint from the intermediate saturation pulse set, at least one readout block of the readout block set includes a readout saturation pulse of the readout saturation pulse set, and at least one intermediate saturation pulse of the intermediate saturation pulse set takes place between two successive readout blocks of the readout block set.
SYSTEM AND METHOD FOR MEASURING VELOCITY PROFILES
Method of determining a velocity profile of a fluid flowing through a conduit, the method including applying a saturation pulse on spins of magnetic field-sensitive nuclei in the fluid, measuring a signal of the fluid to determine position of the magnetic field-sensitive nuclei, the measurement carried out at a recovery time ‘TR’ and at a distance ‘d’ within the conduit, determining within the conduit a radial distance ‘r’ characterized by a local minimum in the measured signal, wherein the radial distance ‘r’ is measured from the center of the conduit, and determining a velocity profile of the fluid at the radial distance, based on the magnetic field-sensitive nuclei.