MAGNETIC RESONANCE IMAGING OF THE NORMAL EYE AND ORBIT OF THE DOG AND CAT

Authors

  • Rhea V. Morgan DVM,

    Corresponding author
    1. Department of Urban Practice (Morgan, Daniel) and Pathobiology (Donnell), College of Veterinay Medicine, University of Tennessee, Knoxville, TN 37901.
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  • Gregory B. Daniel DVM, MS,

    1. Department of Urban Practice (Morgan, Daniel) and Pathobiology (Donnell), College of Veterinay Medicine, University of Tennessee, Knoxville, TN 37901.
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  • Robert L. Donnell DVM

    1. Department of Urban Practice (Morgan, Daniel) and Pathobiology (Donnell), College of Veterinay Medicine, University of Tennessee, Knoxville, TN 37901.
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  • This study was supported by a grant from the University of Tennessee College of Veterinary Medicine Centers of Excellence in Livestock Diseases and Animal Models.

Address reprint requests to Dr. Morgan, Department of Urban Practice, College of Veterinary Medicine, University of Tennessee, P.O. Box 1071, Knoxville, TN 37901.

Abstract

Magnetic resonance (MR) images of the normal eye and orbit of the dog and cat were acquired. T1-weighted, proton-density, and T2-weighed images were obtained in the oblique dorsal, straight sagittal, and oblique sagittal planes. Signal intensity for the various orbital structures differed among the three resonance techniques. T1-weighted images provided the greatest contrast of the retrobulbar structures. T-1 weighted images also had the highest signal to noise ratio, thereby providing the best anatomic detail. Anatomic components of the globe, retrobulbar structures and ocular adnexa were easily seen in all MR sections. The oblique dorsal and oblique sagittal planes were superior for evaluating the optic nerve in its entirety.

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