MRI : basic principles and applications by Brian M. Dale, Mark A. Brown, Richard C. Semelka

By Brian M. Dale, Mark A. Brown, Richard C. Semelka

This 5th variation of the main obtainable advent to MRI ideas and functions from popular academics within the box offers an comprehensible but finished update.

  • Accessible introductory consultant from well known lecturers within the field
  • Provides a concise but thorough advent for MRI targeting basic physics, pulse sequences, and medical purposes with out providing complex math
  • Takes a pragmatic method, together with updated protocols, and helps technical techniques with thorough causes and illustrations
  • Highlights sections which are without delay proper to radiology board exams
  • Presents new info at the most recent test innovations and functions together with three Tesla entire physique scanners, questions of safety, and the nephrotoxic results of gadolinium-based distinction media

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0 T. 6). 5 ppm chemical shift difference mentioned previously is an approximate difference. The fat resonance signal is a composite from all the protons within the fat molecule. , saturated versus unsaturated hydrocarbon chain, length of hydrocarbon chain) determines the exact resonant frequency for this composite signal. 5 ppm difference applies to the majority of fatty tissues found in the body. Chemical shift differences between protons in different molecular environments provide the basis for MR spectroscopy, which is described in more detail in Chapter 13.

7) Increased resolution is obtained by reducing the FOVPE or by increasing NPE . The FOV reduction is accomplished by increasing the gradient amplitude change from one GPE to the next. 9 Phase-encoding process. A spin at the edge of the FOV in the phase-encoding direction undergoes 90∘ of phase change Δ???? from one phase-encoding step to the next. Each point within the FOV undergoes progressively less phase change for the same gradient amplitude. A spin at isocenter never experiences any phase change.

Gradients are also applied for short periods of time during a scan and are referred to as gradient pulses. 1 can be reduced to a vector representation. Each gradient is centered around a point in the center of the magnet known as an isocenter. Variations to one side of the isocenter will have total magnetic field values Bi greater than that at the isocenter (B0 ) while locations on the other side will have Bi less than B0 . 1. MRI Basic Principles and Applications, Fifth Edition. Brian M. Dale, Mark A.

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