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THE EFFECT OF VARYING ECHO TIME USING T2‐WEIGHTED FSE SEQUENCES ON THE MAGIC ANGLE EFFECT IN THE COLLATERAL LIGAMENTS OF THE DISTAL INTERPHALANGEAL JOINT IN HORSES
Authors:Natasha M Werpy  Charles P Ho  E B Garcia  Christopher E Kawcak
Institution:1. Department of Radiology, University of Florida, , Gainesville, FL 32610;2. Steadman Philippon Research Institute, , Vail, CO 81657;3. Radiology Section, Louisiana State University Veterinary Teaching Hospital, , Baton Rouge, LA 70803;4. Equine Orthopaedic Research Center, Colorado State University Veterinary Teaching Hospital, , Fort Collins, CO 80523
Abstract:Eight skeletally mature equine cadaver distal forelimbs were imaged using T2‐weighted fast spin echo (FSE) sequences in a 1.0 T horizontal bore magnet. Each limb was parallel to the main magnetic field and with 16° angulation of the limb relative to the main magnetic field, which places one of the collateral ligaments of the distal interphalangeal joint at or near the magic angle. Each limb was imaged using an echo time (TE) of 80, 100, 120, and 140 ms. Reversal of the magic angle effect was achieved at echo time of 140 ms. However, given the alterations in tissue contrast and subjective decrease in the signal‐to‐noise ratio at this TE, it may be preferable to use a shorter TE for clinical imaging. A T2‐weighted FSE sequence with an echo time of 120 ms maintained image quality while subjectively minimizing the magic angle effect. A sequence with long TE can be used to aid in the differentiation of pathologic change from artifactual increases in signal intensity in collateral ligaments of the equine distal interphalangeal joint, but could decrease the sensitivity for small or low contrast lesions. Multiple factors should be considered when selecting the TE for a T2‐weighted FSE sequence that will be utilized in a musculoskeletal protocol including evaluation of equine feet.
Keywords:collateral ligament  equine  MRI
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