MICCAI 2013 - LNCS 8149-8151

Patient-Specific Biomechanical Modeling of Ventricular Enlargement in Hydrocephalus from Longitudinal Magnetic Resonance Imaging

Yasheng Chen¹, Zheng Fan², Songbai Ji⁵, Joseph Muenzer^{3, 4}, Hongyu An¹, and Weili Lin¹

¹Biomedical Research Imaging Center, Dept. of Radiology, University of North Carolina at Chapel Hill, NC, 27599, USA
yasheng_chen@med.unc.edu
hongyuan@med.unc.edu
weili_lin@med.unc.edu

²Biomedical Research Imaging Center, Dept. of Neurology, University of North Carolina at Chapel Hill, NC, 27599, USA
zheng_fan@med.unc.edu

³Biomedical Research Imaging Center, Dept. of Pediatrics, University of North Carolina at Chapel Hill, NC, 27599, USA

⁴Biomedical Research Imaging Center, Dept. of Genetics, University of North Carolina at Chapel Hill, NC, 27599, USA
joseph_muenzer@med.unc.edu

⁵Thayer School of Engineering, Dartmouth College, Hanover, NH 03755, USA
songbai.ji@dartmouth.edu

Abstract. Ogden type of hyperelastic constitutive law has recently emerged in modeling ventricular enlargement in hydrocephalic brain with finite element method, but this material property for brain tissue has not been investigated in a patient-specific setting in hydrocephalus. Consequently, the accuracy of the simulated ventricular enlargement using this hyperelastic tissue property remains unknown. In this study, we evaluated this brain material model in four patients with communicating hydrocephalus under a small trans-mantle pressure difference (TPMD) between brain ventricle and subarachnoid space (<1mmHg). Based upon changes in ventricular geometries obtained with sequential MRI, we found that this hyper-elastic model has a great flexibility and accuracy in modeling ventricular enlargement (with errors less than 1mm). Our study supports the utility of this hyperelastic constitutive law for future hydrocephalus modeling and suggests that the observed ventricular enlargement in these patients may be caused by a slight increase in TMPD.

Keywords: Brain finite element modeling, Brain mechanics, Hydrocephalus, Hyper-elastic brain modeling, Finite element analysis, Ventricular enlargement

LNCS 8151, p. 291 ff.

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