Abstract
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 2.0mmHg.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=2.0mmHg 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.
| Original language | English |
|---|---|
| Pages (from-to) | 235-244 |
| Number of pages | 10 |
| Journal | Medical Image Analysis |
| Volume | 24 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 2015 Aug 1 |
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Keywords
- Bi-phase
- Biomechanics
- Finite element model
- Normal pressure hydrocephalus
- Transmantle pressure gradient
ASJC Scopus subject areas
- Computer Graphics and Computer-Aided Design
- Computer Vision and Pattern Recognition
- Radiology Nuclear Medicine and imaging
- Health Informatics
- Radiological and Ultrasound Technology
Cite this
Finite element analysis for normal pressure hydrocephalus : The effects of the integration of sulci. / Kim, Hakseung; Park, Dae Hyeon; Yi, Seong; Jeong, Eun Jin; Yoon, Byung C.; Czosnyka, Marek; Sutcliffe, Michael P F; Kim, Dong Ju.
In: Medical Image Analysis, Vol. 24, No. 1, 01.08.2015, p. 235-244.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Finite element analysis for normal pressure hydrocephalus
T2 - The effects of the integration of sulci
AU - Kim, Hakseung
AU - Park, Dae Hyeon
AU - Yi, Seong
AU - Jeong, Eun Jin
AU - Yoon, Byung C.
AU - Czosnyka, Marek
AU - Sutcliffe, Michael P F
AU - Kim, Dong Ju
PY - 2015/8/1
Y1 - 2015/8/1
N2 - 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 2.0mmHg.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=2.0mmHg 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.
AB - 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 2.0mmHg.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=2.0mmHg 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.
KW - Bi-phase
KW - Biomechanics
KW - Finite element model
KW - Normal pressure hydrocephalus
KW - Transmantle pressure gradient
UR - http://www.scopus.com/inward/record.url?scp=84938059776&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84938059776&partnerID=8YFLogxK
U2 - 10.1016/j.media.2015.05.006
DO - 10.1016/j.media.2015.05.006
M3 - Article
VL - 24
SP - 235
EP - 244
JO - Medical Image Analysis
JF - Medical Image Analysis
SN - 1361-8415
IS - 1
ER -