3160 Mitigate B 1 + inhomogeneity by the combination of RF shimming and B 1 + remapping using nonlinear gradient coils
نویسندگان
چکیده
Mitigate B1+ inhomogeneity by the combination of RF shimming and B1+ remapping using nonlinear gradient coils Yi-Cheng Hsu, Ying-Hua Chu, Riccardo Lattanzi, Daniel K Sodickson, and Fa-Hsuan Lin Institute of Biomedical Engineering, National Taiwan University, Taipei, Taiwan, The Bernard and Irene Schwartz Center for Biomedical Imaging, Department of Radiology, New York University School of Medicine, NY, United States, Aalto University, Finland
منابع مشابه
B ‐ mapping and B inhomogeneity correction at high field THÈSE NO 6582 ( 2015 ) ÉCOLE POLYTECHNIQUE FÉDÉRALE DE LAUSANNE
Magnetic resonance imaging is a modern imaging technique that allows anatomical images used in many medical diagnosis to be acquired in a completely non-invasive way. MR images acquired at the highest strength of the main magnetic field B0 are of interest since they highly benefit from the increased signal to noise ratio which is proportional to B0. At ultra high field strengths (B0 ≥ 7 Tesla) ...
متن کاملExploring the limits of RF shimming for high-field MRI of the human head.
Several methods have been proposed for overcoming the effects of radiofrequency (RF) magnetic field inhomogeneity in high-field MRI. Some of these methods rely at least in part on the ability to independently control magnitude and phase of different drives in either one multielement RF coil or in different RF coils in a transmit array. The adjustment of these drive magnitudes and phases alone t...
متن کاملAssessment of the Characteristics of MRI Coils in Terms of RF Non-Homogeneity Using Routine Spin Echo Sequences
Introduction: One of the major causes of image non-uniformity in MRI is due to the existence of non-homogeneity in RF receive and transmit. This can be the most effective source of error in quantitative studies in MRI imaging. Part of this non-homogeneity demonstrates the characteristics of RF coil and part of it is due to the interaction of RF field with the material being imaged...
متن کاملOuter Volume Suppression (OVS) for Single Voxel Spectroscopy (SVS) at 7 Tesla using interleaved B1 shim settings
Introduction High-field magnetic resonance spectroscopy (MRS) has the potential to provide enhanced neurochemical information based on increased sensitivity and higher spectral resolution. However, problems arising in high-field magnetic resonance imaging (MRI), such as more pronounced B0 and B1 inhomogeneities, may decrease spectral resolution and ultimately the quantification accuracy. A mult...
متن کاملSlab selective, regularized RF shimming
Introduction RF shimming is a well-known technique, where amplitudes and phases of a transmit RF coil array are optimized to obtain a homogeneous B1 profile, i.e., to compensate wave propagation effects at main fields of 3T or above (see, e.g., [1]). Among other anatomies, legs are particularly prone to wave propagation effects due to their bi-cylindrical geometry, resulting in significant sign...
متن کامل