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.
Formerly Fellow in Neuroradiology and Instructor, Mallinckrodt Institute of Radiology, Washington University School of Medicine, St. Louis, Missouri/USA
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© 1986 Springer-Verlag Berlin Heidelberg
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Teng, M.M.H., Sartor, K. (1986). Magnetic Resonance Imaging of the Sellar and Juxtasellar Region. In: Computed Tomography of the Pituitary Gland. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-70375-1_19
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DOI: https://doi.org/10.1007/978-3-642-70375-1_19
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-642-70377-5
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