نتایج جستجو برای: shimming

تعداد نتایج: 517  

2009
P. R. Harvey C. Possanzini J. Simons

Introduction. Clinical 3T MRI systems capable of parallel RF transmission have recently been introduced [1]. With such functionality it has become possible to significantly minimize and even eliminate the RF uniformity issues encountered at these higher field strengths while simultaneously reducing SAR [2]. With the development of any parallel imaging technology the dominant question is “how do...

2003
William E. Hull

Introduction The efficiency of automation with large numbers of individual samples and the quality of the acquired spectra depend heavily on the efficiency and quality of adjustments made to the B0 field homogeneity (shimming) after each sample change. The adjustments required depend mainly on sample properties such as bulk magnetic susceptibility of the solvent, volume, and position within the...

Journal: :Physical Review Special Topics - Accelerators and Beams 2009

Journal: :Japanese Journal of Radiological Technology 1997

Journal: :IEEE Transactions on Instrumentation and Measurement 2014

2008
D. N. Splitthoff M. Zaitsev

Introduction: Due to the direct relationship between frequency and spatial location, a high field homogeneity is paramount for accurate imaging in MRI. In order to adjust the field, several orders of shim coils are usually available, along with a multitude of methods to detect the optimal settings, ranging from manual to automatic methods ([1]). Recently, a proof of concept has been presented o...

Journal: :Procedia Manufacturing 2021

In this work, two methods for predictive shimming based on laser scan technology and point cloud processing software have been presented. The first one is direct measurement method in PolyWorks, the second feature-based modelling SolidWorks. Firstly, both component-level assembly-level scans are collected by a scanner. Then, clouds post-processed registered PolyWorks. Thirdly, gap information (...

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