摘要:
The invention relates to a magnetic resonance imaging (MRI) system 1 comprising a magnet unit 4 that carries out an MRI sequence for generating MRI signals of a patient 2, excites a resonator device 8, 38 attached to the patient or to an object not being the patient and comprising a resonator element having piezoelectric properties and a coil element connected to the resonator element, and receives resonator device signals from the resonator device. A processor 5 reconstructs an MR image of the patient based on the MRI signals and determines a property of the patient or the object, to which the resonator device is attached, based on the received resonator device signals. This allows determining the property of the patient or the object by the MRI system without necessarily requiring, besides the resonator device, additional hardware, i.e. the property can be determined without requiring sophisticated additional hardware.
摘要:
The invention pertains to advances in real-time methods in nuclear magnetic resonance by offering: • a new real-time processing method for nuclear magnetic resonance (NMR) spectrum acquisition without external resonator(s), which remains stable despite magnetic field fluctuations, • a new processing method for nuclear magnetic resonance spectrum acquisition, which remains stable despite magnetic field fluctuations and resonator stability, • a new method of constructing predetermined magnets from appropriate magnetic material that allows for focusing the magnetic field in a target region, • a new dual frequency dynamic nuclear polarization (DNP) generator that polarizes the spin of electrons and acts as an NMR transmitter.
摘要:
A method and apparatus for estimating a flow rate of a phase of a multiphase fluid is disclosed. A first velocity distribution is obtained for a first set of nuclei in the fluid from a Nuclear Magnetic Resonance (NMR) signal received for the fluid in response to a first NMR excitation signal. A second velocity distribution is obtained for a second set of nuclei in the fluid from an NMR signal received for the fluid in response to a second NMR excitation signal. A velocity of the phase is estimated from the first velocity distribution and the second velocity distribution. The flow rate of the phase is estimated using the estimated velocity of the phase and an estimated volume fraction of the phase.
摘要:
Dargestellt und beschrieben ist ein Verfahren zum Betreiben eines kernmagnetischen Durchflussmessgeräts (1), wobei das kernmagnetische Durchflussmessgerät (1) ein Messrohr (2) mit einer Messstrecke (6) aufweist, ein Medium (8) durch das Messrohr (2) geströmt wird und das Medium (8) im Messrohr (2) magnetisiert wird. Der Erfindung liegt die Aufgabe zugrunde ein Verfahren anzugeben, bei dem die Abhängigkeit einer Bestimmung einer Geschwindigkeit des Mediums (8) durch das Messrohr (2) von Eigenschaften oder dem Zustand des Mediums (8) zumindest reduziert ist. Die Aufgabe ist dadurch gelöst, dass ein mit einer ersten Geschwindigkeit strömendes erstes Volumen (10) des magnetisierten Mediums (8) innerhalb der Messstrecke (6) zu kernmagnetischen Resonanzen angeregt wird und ein erster Signalverlauf gebildet wird, indem mindestens ein die kernmagnetischen Resonanzen des Mediums (8) im ersten Volumen (10) innerhalb der Messstrecke (6) charakterisierendes Signal bestimmt wird, dass anschließend ein mit einer zweiten Geschwindigkeit strömendes zweites Volumen (11) des magnetisierten Mediums (8) innerhalb der Messstrecke (6) zu kernmagnetischen Resonanzen angeregt wird und ein zweiter Signalverlauf gebildet wird, indem mindestens ein die kernmagnetischen Resonanzen des Mediums (8) im zweiten Volumen (11) innerhalb der Messstrecke (6) charakterisierendes Signal bestimmt wird, dass ein Quotientenverlauf bestimmt wird, indem jeweils ein Quotient aus dem mindestens einen Signal des ersten Signalverlaufs und aus dem mindestens einen Signal des zweiten Signalverlaufs bestimmt wird und dass die erste Geschwindigkeit und/oder die zweite Geschwindigkeit unter Verwendung des Quotientenverlaufs bestimmt werden bzw. wird.
摘要:
A method comprises acquiring navigation data during navigation scans at each of a plurality of points in time. A plurality of magnetic resonance imaging (MRI) k-space data corresponding to an imaged object are acquired at the plurality of points in time using Cartesian sampling, the k-space data including at least two spatial dimensions, a time. The respective motion state for each of the k-space data are computed based on the navigation data. At least one image is reconstructed from the plurality MRI k-space data using k-space data corresponding to at least two motion states and the same point in time to reconstruct the at least one image.
摘要:
A method, which is performed by an MRI apparatus, of scanning a blood vessel, includes: sequentially applying, according to a time-of-flight (TOF) method, radio frequency (RF) pulses respectively to first grouped slabs during a first repetition time (TR); sequentially acquiring MR signals respectively corresponding to the RF pulses applied during the first TR; sequentially applying, according to the TOF method, RF pulses respectively to second grouped slabs during a second TR; and sequentially acquiring MR signals respectively corresponding to the RF pulses applied during the second TR.
摘要:
The present invention relates to a method and to a system for configuring a magnetic field generating device (1) for directioning magnetic substances (300), comprising an image capturing device and a computer device, the image capturing device being electronically connected to the computer device, the image capturing device being configured to obtain at least one image of at least two dimensions of the body area (500) and locate, in said at least one image of two dimensions of the body area (500), a target area (400), the image capturing device generating at least one image of at least two dimensions of the target area (400) from said at least one image of at least two dimensions of the body area (500), the image capturing device being configured to send said at least one image of at least two dimensions of the target area (400) to the computer device, the computer device being configured to generate a three-dimensional geometry of the target area (400) from said at least one image of at least two dimensions of the target area (400), the computer device being further configured to generate a three-dimensional geometry of the magnetic field generating device (1) correlated to the three-dimensional geometry of the target area (400).