MRI and Its Hardware

  • Marinus T. Vlaardingerbroek
  • Jacques A. den Boer


There are several textbooks on magnetic resonance, giving an excellent treatment of the basic concepts of MR physics, see for example [1, 2]. So in this chapter we shall restrict ourselves to summarizing these basic physics concepts and we refer the reader to other books for qualitative descriptions [3–7] and to the detailed technical treatment in [8]. Since magnetic resonance imaging (MRI) is the topic of this textbook, there will be no discussion on MR spectroscopy and, furthermore, only imaging on the basis of proton spin will be considered. Taking these restrictions into account in Sect. 1.1 we summarize the basic physics concepts of magnetization, precession, excitation, and relaxation. The signal obtained from precessing spins is the free induction decay, which will be turned into a spin echo, as is described in Sect. 1.2. Then the methods to determine the position of certain spins in the object on the basis of gradient fields will be discussed. As a first example of an imaging method the “Spin-Echo” measuring sequence is described. This Spin-Echo sequence is the oldest imaging method used [9], it is followed by an overwhelming amount of newer methods [10], the underlying theory of which is the topic of this book.


Gradient Field Eddy Current Magnetization Vector Selection Gradient Gradient Coil 
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Copyright information

© Springer-Verlag Berlin Heidelberg 2003

Authors and Affiliations

  • Marinus T. Vlaardingerbroek
    • 1
  • Jacques A. den Boer
    • 2
  1. 1.The Netherlands
  2. 2.The Netherlands

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