http://rdf.ncbi.nlm.nih.gov/pubchem/patent/WO-2017178796-A1
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_2a75f69690de838337a47aeebfdecc43 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G01R33-286 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G01R33-287 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G01R33-288 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G01R33-5612 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G01R33-3664 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G01R33-365 |
| classificationIPCAdditional | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G01R33-561 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G01R33-36 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G01R33-44 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G01R33-54 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G01R33-56 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G01R33-32 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G01R33-28 |
| filingDate | 2017-04-06-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_e6e60b3c9d4538dde734c82a55d8e5ca http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_bcf9f77ba472828f4a1eb2d9c9611e97 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_c835b79832cd57026307c27aac309265 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_d4e92fc7f670d646014372cd9e4e11bb |
| publicationDate | 2017-10-19-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | WO-2017178796-A1 |
| titleOfInvention | Parallel transmit rf power control for nmr imaging of a subject and invasive conductive objects |
| abstract | Parallel transmit Magnetic Resonance MR scanner used to image a conductive object such as an interventional device like a guidewire within a subject. This is achieved by determining which Radio Frequency RF transmission modes produced by the parallel RF transmission elements couple with the conductive object and then transmitting at significantly reduced power so as to prevent excessive heating of the conductive object to an extent that would damage the surrounding tissue of the subject, for example, the coupling RF transmission modes may be generated at less than 30%, preferably around 10% of the normal power levels that would conventionally be used for MR imaging. However, even at these low power levels sufficient electric currents are induced in the conductive device to cause detectable MR signals; the location of the conductive object within the subject can thus be visualised. By fast alternate, or simultaneous, iterative application of low-power coupling mode and normal-power non-coupling modes, both the subject and the conductive object can be imaged. During the calibration step of determining which RF transmission modes couples with the conductive object, instead of physically measuring the current induced in the conductive object using sensors, imaging the conductive object using additional very short series of flip angle RF pulses (vLFA) gives a good approximation of the coupling matrix. |
| priorityDate | 2016-04-13-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
| Predicate | Subject |
|---|---|
| isDiscussedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/compound/CID6918037 http://rdf.ncbi.nlm.nih.gov/pubchem/substance/SID452547071 |
Total number of triples: 27.