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MAGNETIC RESONANCE IMAGING—A GENERAL OVERVIEW OF PRINCIPLES AND EXAMPLES IN VETERINARY NEURODIAGNOSIS
Author(s) -
Thomson Christine E.,
Kornegay Joe N.,
Burn Robert A.,
Drayer Burton P.,
Hadley Donald M.,
Levesque Donald C.,
Gainsburg Larry A.,
Lane Stephen B.,
Sharp Nicholas J.H.,
Wheeler Simon J.
Publication year - 1993
Publication title -
veterinary radiology and ultrasound
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.541
H-Index - 60
eISSN - 1740-8261
pISSN - 1058-8183
DOI - 10.1111/j.1740-8261.1993.tb01986.x
Subject(s) - magnetic resonance imaging , medicine , nuclear magnetic resonance , excited state , radio frequency , radiofrequency coil , magnetic field , signal (programming language) , biomedical engineering , radiology , physics , atomic physics , computer science , telecommunications , quantum mechanics , programming language
Magnetic resonance imaging (MRI), a noninvasive technique that provides accurate, detailed, anatomic images, has had a major impact in the diagnosis of human disease. This technique is based upon the inherent magnetic properties of certain nuclei. Induction of the nuclei into a low energy state is achieved by placing them in a static magnetic field. The nuclei may then be excited into a high energy state by application of a radio frequency pulse. When the second field is stopped, the nuclei return to ground state and emit the absorbed energy in the form of a radio signal. This signal is received by a coil that generally surrounds the specimen and converted to an anatomic image through a process of computer‐assisted reconstruction. Contrast is altered by applying the second pulse in different sequences (saturation recovery, inversion recovery, and spin echo) and using enhancing agents such as gadolinium. In this paper, we present an overview of the general principles of MRI and some clinical examples in dogs and cats with central nervous system disease.