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Finite element analysis for normal pressure hydrocephalus: The effects of the integration of sulci

 Hakseung Kim  ;  Dae-Hyeon Park  ;  Seong Yi  ;  Eun-Jin Jeong  ;  Byung C. Yoon  ;  Marek Czosnyka  ;  Michael P.F. Sutcliffe  ;  Dong-Joo Kim 
 MEDICAL IMAGE ANALYSIS, Vol.24(1) : 235-244, 2015 
Journal Title
Issue Date
Cerebral Cortex/pathology* ; Cerebral Cortex/physiopathology* ; Computer Simulation ; Elastic Modulus ; Finite Element Analysis ; Humans ; Hydrocephalus, Normal Pressure/pathology* ; Hydrocephalus, Normal Pressure/physiopathology* ; Image Interpretation, Computer-Assisted/methods ; Intracranial Pressure ; Magnetic Resonance Imaging/methods* ; Models, Neurological* ; Reproducibility of Results ; Sensitivity and Specificity ; Stress, Mechanical
Bi-phase ; Biomechanics ; Finite element mode ; Normal pressure hydrocephalus ; Transmantle pressure gradient
Finite element analysis (FEA) is increasingly used to investigate the brain under various pathological changes. Although FEA has been used to study hydrocephalus for decades, previous studies have primarily focused on ventriculomegaly. The present study aimed to investigate the pathologic changes regarding sulcal deformation in normal pressure hydrocephalus (NPH). Two finite element (FE) models-an anatomical brain geometric (ABG) model and the conventional simplified brain geometric (SBG) model-of NPH were constructed. The models were constructed with identical boundary conditions but with different geometries. The ABG model contained details of the sulci geometry, whereas these details were omitted from the SBG model. The resulting pathologic changes were assessed via four biomechanical parameters: pore pressure, von Mises stress, pressure, and void ratio. NPH was induced by increasing the transmantle pressure gradient (TPG) from 0 to a maximum of 2.0 mmHg. Both models successfully simulated the major features of NPH (i.e., ventriculomegaly and periventricular lucency). The changes in the biomechanical parameters with increasing TPG were similar between the models. However, the SBG model underestimated the degree of stress across the cerebral mantle by 150% compared with the ABG model. The SBG model also overestimates the degree of ventriculomegaly (increases of 194.5% and 154.1% at TPG = 2.0 mmHg for the SBG and ABG models, respectively). Including the sulci geometry in a FEA for NPH clearly affects the overall results. The conventional SBG model is inferior to the ABG model, which accurately simulated sulcal deformation and the consequent effects on cortical or subcortical structures. The inclusion of sulci in future FEA for the brain is strongly advised, especially for models used to investigate space-occupying lesions.
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1. College of Medicine (의과대학) > Dept. of Neurosurgery (신경외과학교실) > 1. Journal Papers
Yonsei Authors
Yi, Seong(이성)
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