Magnetic Resonance Imaging of the Sellar and Juxtasellar Region

  • Michael Mu Huo Teng
  • Klaus Sartor

Abstract

Magnetic resonance imaging (MRI) is a tomographic method that utilizes the physical phenomenon of nuclear magnetic resonance (NMR). Most MR imagers operate at field strengths of between 0.15 and 1.5 Tesla (T), the superconducting magnets with field strengths above 0.3 T generally possessing better image quality. The imaging process is roughly as follows: first the patient is moved into the magnet. After a short tuning procedure bursts of radiofrequency (RF) waves, emitted from an RF coil inside the magnet, are radiated into the patient’s body. The purpose of this is to excite the hydrogen nuclei or protons in the tissue. For this to be successful, the RF needs to match exactly the frequency with which the protons spin around the (z) axis of the magnetic field. Only then, at Larmor-frequency, resonance, i.e., energy transfer, occurs.

Keywords

Lymphoma Adenoma Germin Meningioma Reso 

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Copyright information

© Springer-Verlag Berlin Heidelberg 1986

Authors and Affiliations

  • Michael Mu Huo Teng
    • 1
    • 2
  • Klaus Sartor
    • 3
  1. 1.Department of Radiology, Veterans General HospitalNational Yang-Ming Medical CollegeTaipeiTaiwan
  2. 2.National Defense Medical CenterTaipeiTaiwan
  3. 3.Mallinckrodt Institute of RadiologyWashington University School of MedicineSt. LouisUSA

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