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Am J Vet Res. 2013 Feb;74(2):232-8. doi: 10.2460/ajvr.74.2.232.

Comparison of inversion recovery gradient echo with inversion recovery fast spin echo techniques for magnetic resonance imaging detection of navicular bone marrow lesions in horses.

Author information

1
Diagnostic Imaging Department, Faculty of Veterinary Medicine, University of Montreal, St-Hyacinthe, QC J2S 7C6, Canada. julien_olive_veto@hotmail.com

Abstract

OBJECTIVE:

To compare navicular bone marrow lesion (BML) conspicuity in the feet of horses as determined via 2 fat-suppressed MRI techniques, including standard short tau inversion recovery (STIR) and inversion recovery gradient echo (IRGE).

SAMPLE:

Feet (n = 150) of horses with lameness referable to the distal portion of the digit.

PROCEDURES:

STIR and IRGE sequences were obtained prospectively in all feet with a standing low-field equine MRI system. Presence of a BML was ascertained by identification of a characteristic combination of marrow alterations in T1-weighted, T2*-weighted, T2-weighted, and STIR images. Signal-to-noise and contrast-to-noise ratios were calculated on STIR and IRGE sequences in 56 feet with a navicular BML.

RESULTS:

Signal-to-noise and contrast-to-noise ratios of both sequences correlated linearly (r = 0.87 and r = 0.92, respectively) but were significantly higher for STIR images (mean ± SD, 22.6 ± 12.7 and 12.4 ± 11.4, respectively), compared with IRGE images (13.7 ± 8.0 and 5.9 ± 7.2, respectively).

CONCLUSIONS AND CLINICAL RELEVANCE:

Results suggested that the IRGE sequence revealed BMLs significantly less conspicuously, compared with the standard STIR sequence. The 2 techniques cannot be used interchangeably, and IRGE is therefore not recommended as the sole fat-suppressed sequence for routine equine standing MRI protocols.

PMID:
23363347
DOI:
10.2460/ajvr.74.2.232
[Indexed for MEDLINE]
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