Published in:
01-02-2012 | Head and Neck
Near-real time oculodynamic MRI: a feasibility study for evaluation of diplopia in comparison with clinical testing
Published in: European Radiology | Issue 2/2012
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Objective
To demonstrate feasibility of near-real-time oculodynamic magnetic resonance imaging (od-MRI) in depicting extraocular muscles and correlate quantitatively the motion degree in comparison with clinical testing in patients with diplopia.
Methods
In 30 od-MRIs eye movements were tracked in the horizontal and sagittal plane using a a TrueFISP sequence with high temporal resolution. Three physicians graded the visibility of extraocular muscles by a qualitative scale. In 12 cases, the maximal monocular excursions in the horizontal and vertical direction of both eyes were measured in od-MRIs and a clinical test and correlated by the Pearson test.
Results
The medial and lateral rectus muscles were visible in the axial plane in 93% of the cases. The oblique, superior and inferior rectus muscles were overall only in 14% visible. Horizontal (p = 0,015) and vertical (p = 0,029) movements of the right eye and vertical movement of the left eye (p = 0,026) measured by od-MRI correlated positively to the clinical measurements.
Conclusions
Od-MRI is a feasible technique. Visualization of the horizontal/vertical rectus muscles is better than for the superior/inferior oblique muscle. Od-MRI correlates well with clinical testing and may reproduce the extent of eye bulb motility and extraocular muscle structural or functional deteriorations.
Key Points
• Oculodynamic MRI technique helps clinicians to assess eye bulb motility disorders
• MRI evaluation of eye movement provides functional information in cases of diplopia
• Oculodynamic MRI reproduces excursion of extraocular muscles with good correlation with clinical testing
• Dynamic MRI sequence supplements static orbital protocol for evaluation of motility disorders