MRI Principles, Hardware Components and Quantification

Chapter 1 MRI Principles, Hardware Components and Quantification Hervé SAINT-JALMES, Hervé SAINT-JALMES LTSI, Inserm, Université de Rennes, FranceSearch for more papers by this authorHélène RATINEY, Hélène RATINEY CREATIS, CNRS, Inserm, INSA Lyon, Université Claude Bernard Lyon 1, FranceSearch for more papers by this authorOlivier BEUF, Olivier BEUF CREATIS, CNRS, Inserm, INSA Lyon, Université Claude Bernard Lyon 1, FranceSearch for more papers by this author Hervé SAINT-JALMES, Hervé SAINT-JALMES LTSI, Inserm, Université de Rennes, FranceSearch for more papers by this authorHélène RATINEY, Hélène RATINEY CREATIS, CNRS, Inserm, INSA Lyon, Université Claude Bernard Lyon 1, FranceSearch for more papers by this authorOlivier BEUF, Olivier BEUF CREATIS, CNRS, Inserm, INSA Lyon, Université Claude Bernard Lyon 1, FranceSearch for more papers by this author Hélène Ratiney, Hélène RatineySearch for more papers by this authorOlivier Beuf, Olivier BeufSearch for more papers by this author Book Author(s):Hélène Ratiney, Hélène RatineySearch for more papers by this authorOlivier Beuf, Olivier BeufSearch for more papers by this author First published: 19 April 2024 https://doi.org/10.1002/9781394284030.ch1 AboutPDFPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShareShare a linkShare onEmailFacebookTwitterLinkedInRedditWechat Summary This chapter describes magnetic resonance imaging (MRI) principles and the main components of an MRI scanner, in particular those responsible for the generation of magnetic fields and signal acquisition. The static magnetic field is employed both for polarizing the sample and imposing the frequency of excitation and signal acquisition. These two aspects determine the specifications and constraints of the magnet. The chapter explains how the magnetization relaxation to equilibrium can be modulated to obtain information on spatial localization or tissue composition. It discusses the principles of encoding an nuclear magnetic resonance (NMR) image performed using gradients of magnetic fields in a rather succinct way. In order to perform the spatial encoding of information, additional magnetic fields have to be superposed to the main static magnetic field. The NMR signal measured by a magnetic flux detector is obtained after the steps of amplification, demodulation, sampling and digitization via analog or digital converters. References Abragam , A. ( 1961 ). The Principles of Nuclear Magnetism . 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