Design of a cylindrical passive shim insert for human brain imaging at high field (original) (raw)

2009

Abstract

Introduction: Local susceptibility-induced field variations can lead to inhomogeneities that cause artifacts such as image distortion and signal loss. In addition to active shimming, localized passive shimming has been used to reduce field deviations over desired regions of interest for high field MRI [1, 2]. For passive shimming, it is advantageous to position shim elements away from the subject to reduce discomfort. Positions for the shim elements can be computed using methods introduced by Romeo and Hoult [4]. Determining the correct magnetic susceptibility and dimensions for the shim pieces is essential for generation of the desired shim fields. In this work, we introduce a method to determine the requisite magnetic susceptibility and dimensions for the shim elements and verify the accuracy of our technique using simulation.

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