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• Clinical Article •
Application of three-dimensional pseudo-continuous arterial spin labeling combined with automatic segmentation technology in hippocampal sclerotic medial temporal lobe epilepsy
YAN Mengnan  LI Jian  WANG Yiting  BAI Yucai  LI Jinqin  CHEN Bing 

YAN M N, LI J, WANG Y T, et al. Application of three-dimensional pseudo-continuous arterial spin labeling combined with automatic segmentation technology in hippocampal sclerotic medial temporal lobe epilepsy[J]. Chin J Magn Reson Imaging, 2023, 14(9): 26-32. DOI:10.12015/issn.1674-8034.2023.09.005.


[Abstract] Objective To study the application value of three-dimensional pseudo-continuous arterial spin labeling (3D-pCASL) combined with automatic hippocampal segmentation technology in hippocampal sclerotic medial temporal lobe epilepsy (MTLE-HS).Materials and Methods A retrospective analysis was made of 40 cases of patients with unilateral MTLE-HS diagnosed with hippocampal sclerosis (HS) by pathology or MRI from January 2021 to December 2022, and 30 healthy volunteers matched with sex and age were included as the control group. All patients were scanned with axial T1 weighted three-dimensional magnetization intensity preparation gradient echo (3D-T1WI-MPRAGE) sequence and 3D-pCASL sequence on 3.0 T MRI. We used FreeSurfer software to segment the hippocampal subregions of 3D-T1WI images. By fusing the segmented hippocampal subregions with perfusion quantitative maps, we registered and measured the subarea cerebral blood flow (CBF). Compare the differences in CBF values in the hippocampus subregion between the left and right sides of the control group, and the affected and contralateral sides of the MTLE-HS group through paired t-tests. Independent samples t-test was used to compare the variability of CBF values in hippocampal subregions between the control group and the affected side of the MTLE-HS group, and between the control group and the contralateral side of the MTLE-HS group. The diagnostic efficacy of CBF value in each subregion in detecting MTLE-HS was evaluated by using the receiver operating characteristic (ROC) curve and the area under the curve (AUC).Results There was no significant difference in the CBF values of the left and right hippocampal subregions CA1, CA2-3, CA4, granular cell layer of dentate gyrus (GC-DG) in the control group (P＞0.05). In the MTLE-HS group, there was no statistical difference in CBF values between the affected and contralateral CA1 (t=1.075, P=0.289), but there were significant differences in other subregions (all P＜0.001). The CBF values of the affected and contralateral sides of MTLE-HS group were significantly different from those of the control group (P＜0.001). ROC curve analysis results showed that the AUC of CBF values in hippocampal CA1, CA2-3, CA4 and GC-DG subregions were 0.746, 0.831, 0.837 and 0.830.Conclusions For patients with focal medial temporal lobe epilepsy, the measurement of blood perfusion in the hippocampal subregion is of certain significance to accurately locate the epileptogenic zone and its affected area before surgery, and provide imaging basis for understanding the blood perfusion changes in the MTLE-HS subregion before surgery.
[Keywords] medial temporal lobe epilepsy；hippocampal sclerosis；magnetic resonance imaging；arterial spin labeling；hippocampus subregion；automatic segmentation

YAN Mengnan1   LI Jian2   WANG Yiting1   BAI Yucai1   LI Jinqin1   CHEN Bing2*  

1 Clinical Medical College, Ningxia Medical University, Yinchuan 750004, China

2 Department of Radiology, General Hospital of Ningxia Medical University, Yinchuan 750003, China

Corresponding author: Chen B, E-mail: chenbing135501@163.com

Conflicts of interest   None.

ACKNOWLEDGMENTS Key R & D Program of Ningxia Hui Autonomous Region (No. 2020BEG03026); Natural Science Foundation of Ningxia (No. 2023AAC03611).
Received  2023-03-21
Accepted  2023-08-04
DOI: 10.12015/issn.1674-8034.2023.09.005
YAN M N, LI J, WANG Y T, et al. Application of three-dimensional pseudo-continuous arterial spin labeling combined with automatic segmentation technology in hippocampal sclerotic medial temporal lobe epilepsy[J]. Chin J Magn Reson Imaging, 2023, 14(9): 26-32. DOI:10.12015/issn.1674-8034.2023.09.005.

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