Method to determine the actual flip angle and method to adjust the transmitter voltage in a magnetic resonance apparatus
AssigneeSiemens Aktiengesellschaft
InventorAlto Stemmer
Life of this patent
Estimating the term…
Abstract
In a method to determine the actual flip angle in magnetic resonance tomography with continuous table feed, at least one echo signal is generated by a pulse sequence from which an actual flip angle is produced with at least one RF pulse of the sequence, and a gradient scheme is used in the direction of the continuous travel of the examination subject, the gradient scheme being designed such that its first moment disappears at the points in time of each echo signals used for the determination of the flip angle. Such a pulse sequence is also used in a method for adjustment of the transmitter voltage for RF pulses given continuous travel of the examination subject in a magnetic resonance apparatus.
Claims13
A method for operating a magnetic resonance system, comprising:
- from a control unit, operating a magnetic resonance data acquisition unit with a pulse sequence that includes radiating at least one radio-frequency (RE) pulse in an examination subject during continuous travel of said examination subject through the magnetic resonance data acquisition unit, said at least one RF pulse causing nuclear spins in the examination subject, exhibiting a flip angle, forming at least one echo signal with the aid of said at least one RF pulse from signal that it is emitted from said nuclear spins, and said pulse sequence including a gradient scheme;
- and
- configuring said gradient scheme with respect to a direction of said continuous travel to cause a first moment of said gradient scheme in the direction of said continuous travel to disappear at a point in time of said echo signal.
A magnetic resonance apparatus comprising:
- a magnetic resonance data acquisition unit comprising a patient table that is movable through said data acquisition unit and that is configured to receive an examination subject therein;
- a control unit configured to operate said magnetic resonance data acquisition unit with a pulse sequence that includes radiating at least one radio-frequency (RF) pulse in an examination subject during continuous travel of said examination subject on the patient table through the magnetic resonance data acquisition unit, said at least one RF pulse causing nuclear spins in the examination subject exhibiting a flip angle, forming at least one echo signal with the aid of said at least one RF pulse from signal that it is emitted from said nuclear spins, and said pulse sequence including a gradient scheme;
- and
- said control unit being configured to operate said data acquisition unit with a gradient scheme configured with respect to a direction of said continuous travel to cause a first moment of said gradient scheme in the direction of said continuous travel to disappear at a point in time of said echo signal.
A non-transitory, computer-readable data storage medium encoded with programming instructions, said data storage medium being loadable into a computerized processor of magnetic resonance apparatus comprising a data acquisition unit with a continuously moving patient table, said programming instructions causing said computerized control unit to:
- operate the magnetic resonance data acquisition unit with a pulse sequence that includes radiating at least one radio-frequency (RF) pulse in an examination subject during continuous travel of said examination subject on the patient table through the magnetic resonance data acquisition unit, said at least one RF pulse causing e nuclear spins in said examination subject exhibiting a flip angle, forming at least one echo signal with the aid of said at least one RF pulse from signal that it is emitted from said nuclear spins, and said pulse sequence including a gradient scheme;
- and
- to operate said data acquisition unit with a gradient scheme configured with respect to a direction of said continuous travel to cause a first moment of said gradient scheme in the direction of said continuous travel to disappear at a point in time of said echo signal.
Dependencies are inferred from the claim text.