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The human ear cannot distinguish between two sources of sound if they happen to reach within a specific time interval, typically 0.1 seconds apart. More than this, and they are perceived as separate sources.
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[Spin echo and gradient echo : Methodological duo of MRI].

J Leupold1, J Neubauer2, M Bock3

  • 1Klinik für Radiologie, Medizinphysik, Universitätsklinikum Freiburg, Medizinische Fakultät, Universität Freiburg, Breisacher Str. 60a, 79106, Freiburg, Deutschland. jochen.leupold@uniklinik-freiburg.de.

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Magnetic resonance imaging (MRI) uses pulse sequences to acquire anatomical, functional, and metabolic data. This article explains the physical properties of gradient and spin echo sequences for clinical applications.

Keywords:
ApplicationsContrastMagnetic resonance imagingPhysical propertiesPulse sequence

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Area of Science:

  • Medical imaging
  • Physics of magnetic resonance imaging

Background:

  • Clinical magnetic resonance imaging (MRI) provides anatomical, functional, and metabolic information.
  • Pulse sequences are fundamental to MRI data acquisition techniques.

Purpose of the Study:

  • To present the principal physical properties of gradient and spin echo pulse sequences.
  • To connect these physical properties to routine clinical applications of MRI.

Main Methods:

  • Explanation of the physical principles underlying gradient echo sequences.
  • Explanation of the physical principles underlying spin echo sequences.

Main Results:

  • Delineation of the distinct physical properties differentiating gradient and spin echo techniques.
  • Identification of specific clinical applications derived from these properties.

Conclusions:

  • Understanding the physical properties of pulse sequences is key to their clinical utility.
  • Gradient and spin echo sequences form the basis for diverse MRI applications.