AAEP Annual Convention Las Vegas 2009
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Magic Angle Effect in Normal Collateral Ligaments of the Distal Interphalangeal Joint in Horses Imaged with a High-Field Magnetic Resonance Imaging System

Author(s):

N.M. Werpy, C.P. Ho, C.E. Kawcak

In: AAEP Annual Convention - Las Vegas, 2009 by American Association of Equine Practitioners
Updated:
DEC 09, 2009
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1. Introduction
The signal intensity of normal collateral ligaments of the distal interphalangeal (DIP) joint were imaged using short- and long-time echo sequences with the limbs at different angles relative to the main magnet in a high-field magnetic resonance (MR) system. The purpose of this study was to evaluate these images to show the influence of the magic angle effect on the signal intensity of these ligaments.

2. Methods and Materials
Feet were imaged in a neutral position with the long axis of the limb parallel to the main magnetic field using T1-weighted spoiled gradient echo (SPGR), T2*-weighted gradient echo (GRE), proton-density turbo spin echo (TSE), short tau inversion recovery (STIR), and T2-weighted fast-spin echo (FSE) sequences using an ONI 1.0-Tesla Pegasusa  and a 1.5-Tesla GE Signa magnet.b  The limbs were angled at 4, 8, 12, 16, and 20° away from the central axis of the main magnetic field and imaged using the same protocol. [...]

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Affiliation of the authors at the time of publication

Gail Holmes Equine Orthopaedic Research Center, Colorado State University Veterinary Teaching Hospital, Fort Collins, Colorado 80523, USA

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