# US 12,216,189 B2 · Creating calibration data for processing recorded measurement data of an object to be examined using an MR system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,216,189 B2 - Document ID: US12216189B2 - Status: Granted - Kind: B2 - Application number: 17/950,653 - Filed: 2022-09-22 - Published: 2023-03-23 - Granted: 2025-02-04 - Earliest claimed: 2021-09-23 - Assignees: Siemens Healthineers AG - Applicants: Siemens Healthineers AG - Inventors: Mario Zeller; Adam Kettinger - Web page: https://patentgrep.com/patent/US12216189B2 ## CPC - G01R 33/4835: {of multiple slices} - G01R 33/58: Calibration of imaging systems, e.g. using test probes {, Phantoms; Calibration objects or fiducial markers such as active or passive RF coils surrounding an MR active material} - A61B 5/055: involving electronic [EMR] or nuclear [NMR] magnetic resonance, e.g. magnetic resonance imaging - A61B 5/4058: {for evaluating the central nervous system} - A61B 5/7207: {of noise induced by motion artifacts} - G01R 33/5611: {Parallel magnetic resonance imaging, e.g. sensitivity encoding [SENSE], simultaneous acquisition of spatial harmonics [SMASH], unaliasing by Fourier encoding of the overlaps using the temporal dimension [UNFOLD], k-t-broad-use linear acquisition speed-up technique [k-t-BLAST], k-t-SENSE (structural details of arrays of sub-coils G01R33/3415)} - G01R 33/5616: {using gradient refocusing, e.g. EPI} - G01R 33/56341: {Diffusion imaging} - G01R 33/56554: {caused by acquiring plural, differently encoded echo signals after one RF excitation, e.g. correction for readout gradients of alternating polarity in EPI} - A61B 2560/0223: of calibration, e.g. protocols for calibrating sensors - G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12) - A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D) ## Abstract A method for creating calibration data for processing accelerated measurement data of an object to be examined using a magnetic resonance system. The method includes recording measurement data sets using an acquisition acceleration method, recording calibration data sets, and determining processed measurement data sets from the accelerated measurement data sets using the calibration data sets so that effects of the acquisition acceleration method used are eliminated in the processed measurement data sets. The recording of the calibration data sets includes an application of at least one attenuation method for attenuating signals causing phase errors. ## Claims ### Claim 1 A method for creating calibration data for processing accelerated measurement data of an object to be examined using a magnetic resonance system, the method comprising: recording measurement data sets using an acquisition acceleration method; recording calibration data sets; and determining processed measurement data sets from the accelerated measurement data sets using the calibration data sets, so that effects of the acquisition acceleration method used are eliminated in the processed measurement data sets, wherein the recording of the calibration data sets comprises an application of at least one attenuation method for attenuating signals affected by phase errors. ### Claim 2 (depends on 1) The method as claimed in claim 1, wherein the at least one attenuation method comprises attenuating signals of spins in the object to be examined, which cause phase errors in the object to be examined due to a pulsating movement. ### Claim 3 (depends on 1) The method as claimed in claim 1, wherein the attenuation method comprises attenuating signals of spins in a cerebrospinal fluid. ### Claim 4 (depends on 1) The method as claimed in claim 1, wherein the measurement data sets are recorded in a context of a diffusion imaging method. ### Claim 5 (depends on 1) The method as claimed in claim 1, wherein the attenuation method comprises switching of diffusion gradients. ### Claim 6 (depends on 5) The method as claimed in claim 5, wherein the switched diffusion gradients do not exceed a maximum strength. ### Claim 7 (depends on 1) The method as claimed in claim 1, wherein the attenuation method comprises an inversion method which comprises irradiating an inversion pulse for an inversion time before recording of the calibration data sets. ### Claim 8 (depends on 1) The method as claimed in claim 1, wherein the calibration data sets for different subvolumes of the examination object to be measured are recorded in a nested manner. ### Claim 9 (depends on 1) The method as claimed in claim 1, wherein the attenuation method comprises switching of flow compensation gradients. ### Claim 10 (depends on 9) The method as claimed in claim 9, wherein the flow compensation gradients are switched at least in the direction of a direction of movement of spins causing the signals to be attenuated. ### Claim 11 (depends on 1) The method as claimed in claim 1, wherein the acquisition acceleration method is a GeneRalized Autocalibrating Partially Parallel Acquisition (GRAPPA) technique with which the measurement data sets are undersampled according to an acceleration factor, and the processing of the undersampled measurement data sets comprises completing the undersampled measurement data sets to form complete measurement data sets. ### Claim 12 (depends on 1) The method as claimed in claim 1, wherein the acquisition acceleration method is a Controlled Aliasing in Parallel Imaging Results in Higher Acceleration (CAIPIRINHA) technique with which the measurement data sets are recorded in a superimposed manner from at least two layers, and the processing of the measurement data sets recorded in the superimposed manner comprises a separation of the measurement data sets recorded in the superimposed manner into single-layer measurement data sets. ### Claim 13 (depends on 1) A magnetic resonance system, comprising: a magnet unit; a gradient unit; a radio-frequency unit; and a control facility having a radio-frequency transceiver controller and an attenuation unit, wherein the control facility is designed to carry out a method as claimed in claim 1 on the magnetic resonance system. ### Claim 14 (depends on 1) An non-transitory electronically readable data carrier with electronically readable control information stored thereon, which comprises a computer program such that when the data carrier is used in a control facility of a magnetic resonance system, the computer programs carries out the method as claimed in claim 1.