Automatic segmentation technique combined with neurite orientation dispersion and density imaging for observing volume and microstructure changes of hippocampal subregion in patients with hippocampal sclerosis medial temporal lobe epilepsy
10.13929/j.issn.1003-3289.2024.06.009
- VernacularTitle:自动分割技术联合神经突方向离散度及密度成像观察海马硬化型内侧颞叶癫痫患者海马亚区体积与微结构改变
- Author:
Wenrui YANG
1
;
Xucong WANG
;
Jian LI
;
Mengnan YAN
;
Jinqin LI
;
Yanling ZHANG
;
Bing CHEN
Author Information
1. 宁夏医科大学总医院放射科,宁夏银川 750004
- Keywords:
epilepsy,temporal lobe;
magnetic resonance imaging;
hippocampal;
microstructure
- From:
Chinese Journal of Medical Imaging Technology
2024;40(6):838-842
- CountryChina
- Language:Chinese
-
Abstract:
Objective To explore the value of automatic segmentation technique combined with neurite dispersion and density imaging(NODDI)for displaying volume and microstructure changes of hippocampal subregion in patients with hippocampal sclerosis medial temporal lobe epilepsy(mTLE-HS).Methods MRI data of 33 patients with left mTLE-HS(mTLE-HS group)and 35 healthy adults(control group)were retrospectively analyzed.The hippocampal subregions were automatically segmented using FreeSurfer software,the volume of cornu Ammonis(CA)1,CA2-3,CA4,granulose cell-dentate gyrus(GC-DG)and subiculum were measured,then the NODDI parameters of each subregion were obtained through post-processing.The intra-and inter-groups hippocampal subregion volumes and NODDI parameters were compared,and the correlations of parameters being significantly different with the onset age and disease courses were analyzed.Results The volume of hippocampal subregions in mTLE-HS group were all lower than those in control group(all P＜0.05).In mTLE-HS group,the neurite density index(NDI)of left CA1 and CA4 subregions were both lower,while the free-water isotropic volume fraction(fiso)of the left CA1 subregion was higher than those of the right side(all P＜0.05).The orientation dispersion index(ODI)of left CA1,CA2-3 and CA4 subregions,as well as NDI of left CA1,CA4 and GC-DG subregions in mTLE-HS group were all lower than those in control group(all P＜0.05),while fiso of left CA1,GC-DG and subiculum subregions in mTLE-HS group were all higher than those in control group(all P＜0.05).The volume of left hippocampal subregions in patients with mTLE-HS were all moderately positively correlated with the onset age(r=0.540-0.667,all P＜0.001)but weakly negatively correlated with disease courses(r=-0.492--0.386,all P＜0.05).NDI of left CA4 and GC-DG subregions in patients with mTLE-HS were both weakly negatively correlated with disease courses(r=-0.418,-0.388,both P＜0.05).Conclusion Automatic segmentation technique combined with NODDI could be used to display the volume and microstructure changes of mTLE-HS.NDI might be a biomarker of mTLE-HS being sensitive to progressive neuronal damage.
