Dynamic MRI of the orbit
Piccirelli M, Baltes C, Luechinger R, Bergamin O, Soellinger M, Rutz A, Boesiger P
Swiss Federal Institute of Technology & University of Zrich, University Hospital of Zrich
In clinical routine, static MRI serves for detecting mechanical disorders of the orbit. In complex cases there is a need for understanding the dynamics of eye movements and therefore for valuable MRI recording techniques. Using k-t BLAST for dynamic and high-resolution 3D-TFE sequence, the scan time was shortened to be acceptable for subjects without reducing the sharpness of the extraocular muscles. CSPAMM and CDENSE motion encoded images provided information of the movement of homogeneous orbital regions like the vitreous humor and the extraocular muscles. CDENSE showed higher motion sensitivity compared to CSPAMM, but at the cost of greater noise sensitivity.