Dynamic B0 shimming at 7 T
نویسندگان
چکیده
منابع مشابه
Dynamic Bo Shimming at 7 Tesla
Introduction Dynamic Shimming is a technique for obtaining optimal Bo field homogeneity over a volume by updating the shim coil and gradient currents for every slice in a multislice acquisition in real time [1, 2]. Dynamic shimming can produce better field homogeneity within each slice than global volume shimming methods. It can therefore reduce signal losses and geometric distortions and can b...
متن کاملCombination of a sodium birdcage coil with a tunable patch antenna for B0 shimming and anatomical localization at 9.4 T
Table 1. Parameters for the AWSOS sequence. Combination of a sodium birdcage coil with a tunable patch antenna for B0 shimming and anatomical localization at 9.4 T Christian C. Mirkes, Jens Hoffmann, G. Shajan, Rolf Pohmann, and Klaus Scheffler High-Field MR Center, Max Planck Institute for Biological Cybernetics, Tübingen, Germany, Department for Biomedical Magnetic Resonance, University of Tü...
متن کاملAnatomy-specific B0-Shimming Strategies for Robust Clinical Imaging
Inadequate B0-shimming regularly results in suboptimal clinical image quality for several imaging and spectroscopic techniques. Linear shimming is generally a standard commercial offering, and higher-order shimming hardware is also available; however, these tools can be highly operator-dependent. While sporadic recommendations are in the literature, in practice, shimming strategies are typicall...
متن کاملA method for the dynamic correction of B0-related distortions in single-echo EPI at 7 T
We propose a method to calculate field maps from the phase of each EPI in an fMRI time series. These field maps can be used to correct the corresponding magnitude images for distortion caused by inhomogeneity in the static magnetic field. In contrast to conventional static distortion correction, in which one 'snapshot' field map is applied to all subsequent fMRI time points, our method also cap...
متن کاملB 1 shimming with a standard 2 channel headcoil at 7 T : possibilities & limitations
Purpose: To study the possibilities and limitations of RF phase and amplitude shimming with a standard 2 channel head coil at 7T. Introduction One of the main problems in high field MRI is the reduced SNR and loss in contrast due to inhomogeneous B1 RF transmit fields. Spatial homogeneity is of primary importance for diagnostic imaging. At 3T the homogeneity problem is mainly limited to regions...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Magnetic Resonance Imaging
سال: 2011
ISSN: 0730-725X
DOI: 10.1016/j.mri.2011.01.002