92 results about "Magnetic resonance sequence" patented technology

In a method and apparatus for identifying an organ structure of an examined object in magnetic resonance image data, magnetic resonance measurement data for the organ structure of the examined object are acquired by operation of a magnetic resonance scanner using a magnetic resonance sequence that specifies a sampling scheme of k-space. Magnetic resonance image data are reconstructed from the magnetic resonance measurement data. The organ structure is identified in the magnetic resonance image data. The sampling scheme of k-space is selected so as to support the subsequent identification of the organ structure in the magnetic resonance image data reconstructed from the magnetic resonance measurement data.

A magnetic resonance sequence model that is a formal description of a measurement sequence is used to automate measurement sequence programming. The sequence model allows a system-independent specification of the measurement sequence for execution in a magnetic resonance scanner. The sequence model is as formal as possible; it is limited to the minimum required information for description of a measurement sequence without limiting the flexibility in the sequence programming. A method for formal description of the measurement sequence describes the measurement sequence by a number of parameters to be parameterized. The parameterization of the measurement sequence can ensue automatically from the formalized description of the measurement sequence, except for a set of parameters that are still be determined. For automatic generation of an executable measurement sequence, the method determines the parameters to be determined using a solver, under consideration of boundary conditions, so that a consistent set of parameters is created that completely describes the measurement sequence. This complete description of parameter values of the measurement sequence is then be translated automatically into a programming language that can be directly executed in the magnetic resonance scanner.

A magnetic resonance method comprises: performing (C1) a magnetic resonance procedure on a calibration subject including an implant device; detecting (C2) a pick-up coil (PUC) signal at least during a radio frequency transmit phase of operation (C1); performing (C3) three dimensional temperature mapping of the calibration subject using a magnetic resonance sequence configured to detect any temperature change induced in any part of the implant device by operation (C1); generating (C4) an unsafe condition criterion (30) for the detected PUC signal based on correlating a PUC signal characteristic detected by operation (C2) with a temperature change detected by operation (C3); performing (M5) the magnetic resonance procedure on a subject containing an implant device; detecting (M6) a PUC signal at least during a radio frequency transmit phase of operation (M5); and monitoring (M7) for an unsafe condition indicated by the PUC signal detected in operation (M6) satisfying the unsafe condition criterion (30).

In a method and magnetic resonance apparatus to acquire magnetic resonance data with a diffusion-weighted magnetic resonance sequence wherein the magnetic resonance apparatus as a gradient coil arrangement with three gradient coils designed to generate a gradient in gradient directions orthogonal to one another, the readout gradient is flipped relative to at least one of the gradient directions such that at least two gradient coils contribute to a possible slew rate of a readout gradient pulse, and such that a phase coding gradient that is constant over the readout time period is selected.