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EFFECTS OF IMAGE PLANE, PATIENT POSITIONING, AND FORAMINAL ZONE ON MAGNETIC RESONANCE IMAGING MEASUREMENTS OF CANINE

Claudia Zindl1, Russell L Tucker2, Jelena Jovanovik1

  • 1Fitzpatrick Referrals Ltd., Godalming, Surrey, GU7 2QQ, UK.

Veterinary Radiology & Ultrasound : the Official Journal of the American College of Veterinary Radiology and the International Veterinary Radiology Association
|November 19, 2016
PubMed
Summary

Oblique MRI views and hyperextension significantly reduce canine lumbosacral neuroforaminal dimensions. This highlights the dynamic nature of stenosis and aids in diagnosing nerve root impingement in dogs.

Keywords:
MRIdogshyperextended positionlumbosacral foraminal stenosissagittal oblique plane

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Area of Science:

  • Veterinary diagnostic imaging
  • Canine neurology
  • Comparative anatomy

Background:

  • Degenerative lumbosacral stenosis (DLSS) in dogs may involve dynamic compression of nerve roots.
  • Accurate diagnosis of stenosis, particularly L7 nerve root encroachment, is crucial for affected dogs.
  • Human studies suggest angled imaging improves stenosis diagnosis.

Purpose of the Study:

  • To evaluate the effect of imaging plane and spinal positioning on canine lumbosacral neuroforaminal dimensions.
  • To determine if oblique MRI views and hyperextension influence measurements relevant to DLSS.

Main Methods:

  • MRI evaluation of foraminal apertures in 30 dogs with clinical signs of lumbosacral disease.
  • Comparison of standard parasagittal vs. oblique planar orientations.
  • Assessment of neutral vs. hyperextended lumbosacral positioning.

Main Results:

  • Oblique plane acquisition yielded significantly smaller neuroforaminal areas than standard parasagittal views.
  • Hyperextension significantly reduced neuroforaminal dimensions compared to neutral positioning.
  • The combination of oblique imaging and hyperextension showed the most pronounced reduction in neuroforaminal dimensions.

Conclusions:

  • Canine spinal positioning during MRI significantly impacts neuroforaminal dimensions.
  • Oblique imaging planes are more sensitive for detecting subtle reductions in neuroforaminal dimensions.
  • Findings support the dynamic component of canine DLSS and aid in diagnosing L7 nerve root impingement.