| Predicate |
Object |
| assignee |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_01a96e8bbea00eeaa0b50c2a0c000dba
http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_9414eb8baa5e3ff1d70c9b21b4cdb1ba |
| classificationCPCAdditional |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G01R33-243 |
| classificationCPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G01R33-4828
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G01R33-56509
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G01R33-5616
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G01R33-56563
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G01R33-56341 |
| classificationIPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G01R33-565 |
| filingDate |
2014-07-11^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_777eea8c94d645623c5644a9214421c7
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_8343f9ca8a963edb98ceab7c85000ee4
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_9cd28ab75b8c716810465bb51a36e3bb |
| publicationDate |
2016-01-13^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber |
GB-2528123-A |
| titleOfInvention |
Correcting for main magnetic field drift in MRI scanners |
| abstract |
Two 3D interleaved navigator pulse sequences (echo planar pulse sequences) with low flip angle and different echo times are used between imaging of consecutive voxels. A magnetic field map is obtained by complex division of the resultant pair of navigator images. This is used to obtain parameters to adjust the MRI frequency to compensate for B0 drift and shim to compensate for B0 inhomogeneity. Comparison with reference navigator images can also correct for subject motion. The system central frequency is adjusted by adjusting a phase and frequency for a Numerically Controlled Oscillator (NCO) for all radiofrequency (RF) excitation pulses, and for Analogue-to-Digital converter (ADC) pulses for both the parent scanning sequence and the two navigator pulse sequences. |
| priorityDate |
2014-07-11^^<http://www.w3.org/2001/XMLSchema#date> |
| type |
http://data.epo.org/linked-data/def/patent/Publication |