Dynamic shim updating: A new approach towards optimized whole brain shimming Export

@article{citeulike:5911256, abstract = {The static magnetic field within two widely spaced axial slices of the human brain was mapped in five subjects following global shimming. This revealed a first order field shift in the anterior-posterior direction between the cerebellum and cerebrum, which has implications for functional and spectro-scopic magnetic resonance imaging. A new method is described called dynamic shim updating (DSU) to compensate for these field differences whereby the shim correction fields are updated in real time during multislice data acquisition to match the current imaging or spectroscopy slice. A hardware unit is presented to demonstrate the method using the first order shim corrections, which can be updated virtually instantaneously between slice acquisitions to give optimal shimming of each slice. The efficiency of the approach is demonstrated using field mapping and high speed MR imaging (echo-planar imaging), which are sensitive to field inhomogeneity.}, address = {Department of Surgery (Neurosurgery), Yale University, New Haven, Connecticut; Department of Medicine, Yale University, New Haven, Connecticut; Department of Molecular Biophysics and Biochemistry, Yale University, New Haven, Connecticut}, author = {Blamire, Andrew M. and Rothman, Douglas L. and Nixon, Terry}, citeulike-article-id = {5911256}, citeulike-linkout-0 = {http://dx.doi.org/10.1002/mrm.1910360125}, citeulike-linkout-1 = {http://www3.interscience.wiley.com/cgi-bin/abstract/112211808/ABSTRACT}, doi = {10.1002/mrm.1910360125}, issn = {1522-2594}, journal = {Magnetic Resonance in Medicine}, keywords = {dynamic-shimming, engineering, georgios, mrm}, number = {1}, pages = {159--165}, posted-at = {2009-10-08 20:41:55}, priority = {2}, title = {Dynamic shim updating: A new approach towards optimized whole brain shimming}, url = {http://dx.doi.org/10.1002/mrm.1910360125}, volume = {36}, year = {1996} }

TY - JOUR ID - citeulike:5911256 L3 - citeulike-article-id:5911256 N2 - The static magnetic field within two widely spaced axial slices of the human brain was mapped in five subjects following global shimming. This revealed a first order field shift in the anterior-posterior direction between the cerebellum and cerebrum, which has implications for functional and spectro-scopic magnetic resonance imaging. A new method is described called dynamic shim updating (DSU) to compensate for these field differences whereby the shim correction fields are updated in real time during multislice data acquisition to match the current imaging or spectroscopy slice. A hardware unit is presented to demonstrate the method using the first order shim corrections, which can be updated virtually instantaneously between slice acquisitions to give optimal shimming of each slice. The efficiency of the approach is demonstrated using field mapping and high speed MR imaging (echo-planar imaging), which are sensitive to field inhomogeneity. IS - 1 JF - Magnetic Resonance in Medicine SN - 1522-2594 AD - Department of Surgery (Neurosurgery), Yale University, New Haven, Connecticut; Department of Medicine, Yale University, New Haven, Connecticut; Department of Molecular Biophysics and Biochemistry, Yale University, New Haven, Connecticut EP - 165 TI - Dynamic shim updating: A new approach towards optimized whole brain shimming VL - 36 SP - 159 KW - dynamic-shimming KW - engineering KW - georgios KW - mrm AU - Blamire, Andrew AU - Rothman, Douglas AU - Nixon, Terry PY - 1996/// UR - http://dx.doi.org/10.1002/mrm.1910360125 ER -