Papers and Information on Magnetic Resonance Imaging

Readings in MRI This is a short list of reference papers for the student interested in learning about the basics of Magnetic Resonance Imaging. It is a highly opinionated selection...
Determinants of MR Image Quality Also see the related slide set	Basic MR Physics Also see the related slide set
Introduction to Rapid MR Imaging There exist a great variety of methods for decreasing MR scan time, all of which have both good and bad points. This article, based on one written for Diagnostic Imaging, is written for the general reader with a clinical background. It reviews some of the techniques, their applications, and some of their key advantages and limitations. Includes sample MR images from many methods. Also see the related slide set
Motion Compensation in MR Imaging For the past several years methods have been known which compensate for motion-induced distortions in Magnetic Resonance (MR) imaging. This paper summarizes some of that literature and attempts to put it into easily digestible form. This is a relatively technical paper (i.e., there is a lot of math) that presents a formal analysis of the effects of motion on MR images and discusses the use of special gradient switching techniques to reduce the artifacts. In addition, a computationally simple method is demonstrated for the analysis of a variety of time-varying gradient waveforms and the complete solution for a second order motion compensation scheme is given. The general schemes for motion compensation used by all MR manufacturers are similar, though the acronyms used to describe them differ. Siemens uses the term, "GMR" (gradient moment rephasing), General Electric describes the technology simply as "Flow Compensation", where Picker describes the "MAST" (motion artifact suppression technique). The implementations differ somewhat between manufacturers, some companies null only the lower order terms (see below) whereas others use more sophisticated higher order moment nulling.
Basics of Functional Magnetic Resonance Imaging Appeared originally as "Localization of Brain Function by Magnetic Resonance Imaging" in Trends in Neurosciences	A Sampler of MR Artifacts This is an annotated set of images demonstrating common and subtle artifacts that occur in MRI
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©1997-1999 Mark S. Cohen, Ph.D.