منابع مشابه
Shimming Permanent Magnet of MRI Scanner
In this paper an approach of ferromagnetic shimming for permanent MRI magnet is presented. It is designed to reduce unhomogeneity of magnetostatic field of permanent magnet to meet the stringent requirement for MRI applications. An optimal configuration of ferromagnetic pieces is generated through calculation according to the initial field map and the demanded final homogeneity specifications. ...
متن کاملStudy on Shimming Method for Open Perma- Nent Magnet of Mri
The shimming method used for producing high field homogeneity of the open permanent main magnet for magnetic resonance imaging (MRI) is researched in this paper. The central shimming method based on integer programming is proposed, which fulfills the combination of optimal theory and the practical manual shimming. The formulation of shimming is solved by using Lingo software and the numerical a...
متن کاملAn Analytical Approach towards Passive Ferromagnetic Shimming Design for a High-Resolution NMR Magnet.
This paper presents a warm bore ferromagnetic shimming design for a high resolution NMR magnet based on spherical harmonic coefficient reduction techniques. The passive ferromagnetic shimming along with the active shimming is a critically important step to improve magnetic field homogeneity for an NMR Magnet. Here, the technique is applied to an NMR magnet already designed and built at the MIT'...
متن کاملShimming and MRS
Adjustment of the static magnetic field homogeneity, commonly known as the B0 shimming or simply shimming, is essential for magnetic resonance spectroscopy because it determines the spectral resolution which is critical for reliable metabolite quantification. Inhomogeneities in the B0 field, resulting primarily from susceptibility differences between air and tissue, are scaled with the B0 field...
متن کاملShimming and MRSI
INTRODUCTION With the advent of high field 3T and ultrahigh field 7T MR systems, significant improvements in a variety of brain imaging modalities were anticipated. Although improvements in SNR have been demonstrated at 3T and 7T [1, 2], limitations due to increased static field (B0) inhomogeneity have also been noted. One modality particularly affected by poor B0 homogeneity is magnetic resona...
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ژورنال
عنوان ژورنال: Review of Scientific Instruments
سال: 1981
ISSN: 0034-6748,1089-7623
DOI: 10.1063/1.1136547