provide a simple electrical equivalent circuit that lends itself to circuit analysis. The magnetic structure shown in Figure 1 will be the first demonstration of this technique. This simple inductor is built upon a ferrite core, with air gaps to store the required inductive energy created by simply shimming the two core halves apart (not usually a good practice, but inexpensive). Purpose: I. To...

In proton magnetic resonance (MR) spectroscopy (1H-MRS) of the breast cancer, choline peak could be detected. The purpose this study was to evaluate influences tumor volume, full width at half maximum (FWHM) water (FWHM), and T2* value (T2* value) on detection rate peaks 3.0 T-MRI. We measured FWHM in 109 cases, we evaluated effect volume peaks. 1H-MRS cancer T-MRI, improved as larger. As a shi...

Purpose: To show the effect and the increased scan efficiency offered by DREAM-based B1 + shimming in fast whole body fat/water imaging at 3T. Introduction: High field whole-body imaging is a promising technique for quantitative MRI. However, at 3T and above, wave propagation effects can have serious effects on RF field homogeneity (B1 ). This results in spatially varying image contrast and SNR...

Background Balanced-SSFP is widely used because of its inherent highcontrast and high-SNR efficiency, and therefore is an obvious choice for neonatal cardiac applications. Typically, multiple averages are needed due to the high-spatial and temporal resolutions required, especially for the smallest preterm infants. Therefore, prolonged intensive scans are required placing high demands on scanner...

We demonstrate that N,N-Diethylmethylamine (DEMA) is a useful compound for shimming the magnetic field when doing NMR experiments at room temperature and 130 K, near the temperature used in many dynamic nuclear polarization (DNP) experiments. The resonance assigned to the N-methyl carbon in DEMA at 14.7 T and 140 K has a full-width-half-max linewidth of <4 Hz and has a spin-lattice relaxation t...

Fig.2: Simulated field maps along with inslice B1 field statistics and SEE. B1 in homogeneous solutions is scaled by the indicated factors for better visualization. RF Shimming Capabilities at 9.4 Tesla using a 16-channel Dual-Row Array Jens Hoffmann, G. Shajan, Klaus Scheffler, and Rolf Pohmann High-Field Magnetic Resonance Center, Max Planck Institute for Biological Cybernetics, Tuebingen, Ba...

This report investigates the general problem of phase unwrapping for arbitrary n-dimensional phasemaps. A cost function-based approach is outlined which leads to an integer programming problem. To solve this problem a best-pair-first region merging approach is adopted as the optimisation method. The algorithm has been implemented and tested with 3D MRI medical data for fMRI applications in EPI ...