May 2005
Volume 46, Issue 13
Free
ARVO Annual Meeting Abstract  |   May 2005
Deformation of Retrobulbar Fat Analysis With Optical Flow Technique
Author Affiliations & Notes
  • R. Root
    Man–Machine–Systems, ME, Radiology,
    Delft University of Technology, Delft, The Netherlands
  • T.R. de Graaf
    Man–Machine–Systems, ME, Radiology,
    Delft University of Technology, Delft, The Netherlands
  • C.P. Botha
    Visualisation, EWI, Ophthalmology,
    Delft University of Technology, Delft, The Netherlands
  • P. Wielopolski
    Man–Machine–Systems, ME, Radiology,
    Erasmus Medical Centre, Rotterdam, The Netherlands
  • S. Schutte
    Man–Machine–Systems, ME, Radiology,
    Delft University of Technology, Delft, The Netherlands
  • F.C. T. van der Helm
    Man–Machine–Systems, ME, Radiology,
    Delft University of Technology, Delft, The Netherlands
  • H.J. Simonsz
    Visualisation, EWI, Ophthalmology,
    Erasmus Medical Centre, Rotterdam, The Netherlands
  • Footnotes
    Commercial Relationships  R. Root, None; T.R. de Graaf, None; C.P. Botha, None; P. Wielopolski, None; S. Schutte, None; F.C.T. van der Helm, None; H.J. Simonsz, None.
  • Footnotes
    Support  None.
Investigative Ophthalmology & Visual Science May 2005, Vol.46, 4676. doi:
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      R. Root, T.R. de Graaf, C.P. Botha, P. Wielopolski, S. Schutte, F.C. T. van der Helm, H.J. Simonsz; Deformation of Retrobulbar Fat Analysis With Optical Flow Technique . Invest. Ophthalmol. Vis. Sci. 2005;46(13):4676.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract 
 
Abstract:
 

 

The rectus muscles pull the eye back into the orbit and, hence, the retrobulbar fat bears the eye. In order to understand its function, the deformation of the orbital fat was investigated with MRI with an optical flow technique. Together with assessment of material properties of the fat, its deformation must be known for development of the finite element analysis model of orbital mechanics introduced by Schutte et al. (ARVO, 2003).

 

 

Seven T1–weighted scans of 84 slices each were made of the eyes during seven horizontal gaze directions with a 1.5T MRI scanner. Deformation of the fat was analysed with an optical flow technique. Vectorfields describing the non–rigid deformation in 3D were generated for 6 steps between 7 gaze directions. Regions of interest were: between muscle and posterior sclera, around the optic nerve head and the apex.

 

 

The region between muscle and sclera could not be resolved in sufficient detail. The optic nerve moved through the fat with little attachment to it. Motion of the fat around the optic nerve head was apparent. In the apex, the motion of the fat was primarily transverse (fig).

 

 

The retrobulbar fat bears the eye. Despite this, its attachment to the rectus muscles and to the optic nerve seemed loose.

 

 

 
Keywords: eye movements • imaging methods (CT, FA, ICG, MRI, OCT, RTA, SLO, ultrasound) • orbit 
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