Brain motion MRI magnification using eulerian video magnification technique and optical flow quantification

1. S
Seeing the Unseen,
Revealing and Quantifying Brain Motion
T Stefani, D Heitz, M Bintner, J Bonny
Presenting Author
Thomas Stefani, MD
brainmotion@stefani.md
Presentation 1232
Advanced Imaging for Best Assessement

2. Disclosure
S Nothing to disclose

3. Purpose
S Brain micro motion has been previously studied with MRI
S Low spatial/temporal resolution, sensibility
S No off the shelf sequence, no dynamic representation of
motion (Soellinger1)
S Investigate if phase-based EVM coupled with optical flow
post processing on routine cinematic (CINE) TrueFISP
sequence is capable of revealing and quantifying brain
micro motion.

4. Materials and Methods
S Monocentric retrospective study from january 2014 to june
2014.
S 5 healthy volunteers, 26 to 55 years of age
S Axial TrueFISP CINE (Reubelt2) (40 phases), lateral ventricles
plane
S 3T MRI
S EVM (Wadhwa3) – phase based Eulerian Video Magnification
S Post processing, ground truth validated
S 50 fold Magnifcation factor
S Motion quantification before and after EVM
S Optical flow method (Xavier4)
S ROIs : Scalp, Ventricles, Central and Peripheral Brain structures

5. Phase based Eulerian Video
Magnification (Wadhwa3)
Courtesy of
Wadhwa3

6. Results
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Ventricles Central Peripheral Scalp
Optical flow difference (voxel)
S Statistically significant
difference between
optical flow motion
before and after
magnification (p<0.05 T
test)
S Ventricles : 3,47 voxels
(SD 0.91)
S Central : 2.71 voxels
(SD 0.77)
S Peripheral : 2.26 voxels
(SD 0.69)
S Scalp : 1.7 voxels
(SD 0.23)

7. CINE TrueFISP– No magnification

8. 50 fold Magnification

9. Conclusion
S EVM permits to reveal and quantify brain motion with off
the shelf TrueFISP sequences
S Applications in neuroradiology needs to be investigated
S Hydrocephalus : NPH
S Tumor characterization : vascular tumors
S Motion reduction post processing : fMRI
S Tissue stiffness assessment (general diagnostic imaging)

10. References
1 - Soellinger, M., Rutz, A.K., Kozerke, S., Boesiger, P., 2009. 3D cine displacement-encoded
MRI of pulsatile brain motion. Magn. Reson. Med. 61, 153–162. doi:10.1002/mrm.21802
2 - Reubelt, D., Small, L.C., Hoffmann, M.H.K., Kapapa, T., Schmitz, B.L., 2009. MR imaging
and quantification of the movement of the lamina terminalis depending on the CSF dynamics.
AJNR Am. J. Neuroradiol. 30, 199–202. doi:10.3174/ajnr.A1306
3 - Wadhwa N, Rubinstein M, Durand F, et al. Phase-based video motion processing. ACM
Trans Graph 2013;32:1.
4 - Xavier, M., Lalande, A., Walker, P.M., Brunotte, F., Legrand, L., 2012. An adapted optical
flow algorithm for robust quantification of cardiac wall motion from standard cine-MR
examinations. IEEE Trans. Inf. Technol. Biomed. Publ. IEEE Eng. Med. Biol. Soc. 16, 859–868.
doi:10.1109/TITB.2012.2204893

11. Questions
S brainmotion@stefani.md