EFFECT OF DEEP DIGITAL FLEXOR TENDON ORIENTATION ON MAGNETIC RESONANCE IMAGING SIGNAL INTENSITY IN ISOLATED EQUINE LIMBS—THE MAGIC ANGLE EFFECT
Article first published online: 19 MAY 2005
Veterinary Radiology & Ultrasound
Volume 43, Issue 5, pages 428–430, September 2002
How to Cite
Busoni, V. and Snaps, F. (2002), EFFECT OF DEEP DIGITAL FLEXOR TENDON ORIENTATION ON MAGNETIC RESONANCE IMAGING SIGNAL INTENSITY IN ISOLATED EQUINE LIMBS—THE MAGIC ANGLE EFFECT. Veterinary Radiology & Ultrasound, 43: 428–430. doi: 10.1111/j.1740-8261.2002.tb01029.x
- Issue published online: 19 MAY 2005
- Article first published online: 19 MAY 2005
- Received August 15, 2001; accepted for publication January 10, 2002.
- deep digital flexor tendon;
- magnetic resonance imaging;
- magic angle
Ten normal equine isolated limbs were imaged using a knee coil in a 1.5 Tesla magnetic field, with short echo time sequences (TE < 15 ms). Magnetic resonance imaging was performed on each isolated limb in different positions, with and without extension of the metacarpophalangeal joint. Deep digital flexor tendon orientation ranged from 20 to 60 degrees in relation to the static magnetic field. Increased intratendinous signal intensity was observed when the angle between the deep digital flexor tendon and the constant magnetic field approached 55 degrees (“magic angle”). The increased signal intensity was independent from extension of the metacarpophalangeal joint. Recognition of the magic angle phenomenon is essential for proper evaluation of magnetic resonance imaging studies of the equine foot.