Title:
マルチチャンネルRF励起を用いるMR撮像
Document Type and Number:
Japanese Patent JP2013506484
Kind Code:
A
Abstract:
The invention relates to a method of magnetic resonance imaging comprising the following steps:
a) subjecting a body of a patient placed within an examination volume of a magnetic resonance apparatus to an absolute field mapping sequence comprising RF pulses that are generated via an array of RF antennas having spatial transmit and receive sensitivity profiles, wherein a first set of phases and amplitudes of the RF feeding of each individual RF antenna is used,
b) acquiring MR signals, from which the spatial distribution of the RF field transmitted during the absolute field mapping sequence is derived,
c) subjecting the body to a relative field mapping sequence comprising RF pulses that are generated by using a second set of phases and amplitudes of the RF feeding of the RF antennas,
d) acquiring MR signals, from which a relative map of the spatial distribution of the RF field transmitted during the relative field mapping sequence is derived,
e) determining the spatial transmit sensitivity profile of at least one individual RF antenna from the spatial RF field distribution determined in step b) and from the relative map derived in step d). The invention is based on the recognition that, when the RF antennas are symmetrically arranged with respect to an axis or a plane of symmetry, a mirror image RF antenna can be attributed to each RF antenna of the array, so that the spatial transmit sensitivity profile of each RF antenna can be determined from the spatial receive sensitivity profile of the respective mirror image RF antenna, and vice versa.
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Inventors:
Fuderel Miha
Rosein Thomas Hendrik
Caschel Ulrich
Neerke Kai
Harvey Paul Royston
Rosein Thomas Hendrik
Caschel Ulrich
Neerke Kai
Harvey Paul Royston
Application Number:
JP2012531531A
Publication Date:
February 28, 2013
Filing Date:
September 27, 2010
Export Citation:
Assignee:
Koninklijke Philips Electronics N.V.
International Classes:
A61B5/055
Domestic Patent References:
| JP2007503239A | 2007-02-22 | |||
| JP2005152655A | 2005-06-16 | |||
| JP2007503239A | 2007-02-22 | |||
| JP2005152655A | 2005-06-16 |
Foreign References:
| US8938281B2 | 2015-01-20 |
Attorney, Agent or Firm:
Susumu Tsugaru
Fueda Shusen
Takahiro Igarashi
Fueda Shusen
Takahiro Igarashi