Steinbart, David, Yaakub, Siti N, Steinbrenner, Mirja, Guldin, Lynn S, Holtkamp, Martin, Keller, Simon S 
ORCID: 0000-0001-5247-9795, Weber, Bernd, Rueber, Theodor, Heckemann, Rolf, Ilyas-Feldmann, Maria et al (show 1 more authors)
(2023)
Automatic and manual segmentation of the piriform cortex: Method development and validation in patients with temporal lobe epilepsy and Alzheimer's disease.
HUMAN BRAIN MAPPING, 44 (8).
pp. 3196-3209.
Abstract
The piriform cortex (PC) is located at the junction of the temporal and frontal lobes. It is involved physiologically in olfaction as well as memory and plays an important role in epilepsy. Its study at scale is held back by the absence of automatic segmentation methods on MRI. We devised a manual segmentation protocol for PC volumes, integrated those manually derived images into the Hammers Atlas Database (n = 30) and used an extensively validated method (multi-atlas propagation with enhanced registration, MAPER) for automatic PC segmentation. We applied automated PC volumetry to patients with unilateral temporal lobe epilepsy with hippocampal sclerosis (TLE; n = 174 including n = 58 controls) and to the Alzheimer's Disease Neuroimaging Initiative cohort (ADNI; n = 151, of whom with mild cognitive impairment (MCI), n = 71; Alzheimer's disease (AD), n = 33; controls, n = 47). In controls, mean PC volume was 485 mm<sup>3</sup> on the right and 461 mm<sup>3</sup> on the left. Automatic and manual segmentations overlapped with a Jaccard coefficient (intersection/union) of ~0.5 and a mean absolute volume difference of ~22 mm<sup>3</sup> in healthy controls, ~0.40/ ~28 mm<sup>3</sup> in patients with TLE, and ~ 0.34/~29 mm<sup>3</sup> in patients with AD. In patients with TLE, PC atrophy lateralised to the side of hippocampal sclerosis (p < .001). In patients with MCI and AD, PC volumes were lower than those of controls bilaterally (p < .001). Overall, we have validated automatic PC volumetry in healthy controls and two types of pathology. The novel finding of early atrophy of PC at the stage of MCI possibly adds a novel biomarker. PC volumetry can now be applied at scale.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | Hammers Atlas Database, hippocampal sclerosis, MAPER, mild cognitive impairment, morphometry |
| Divisions: | Faculty of Health and Life Sciences Faculty of Health and Life Sciences > Institute of Systems, Molecular and Integrative Biology |
| Depositing User: | Symplectic Admin |
| Date Deposited: | 14 Apr 2023 10:39 |
| Last Modified: | 02 Feb 2024 06:46 |
| DOI: | 10.1002/hbm.26274 |
| Open Access URL: | https://onlinelibrary.wiley.com/doi/full/10.1002/h... |
| Related URLs: | |
| URI: | https://livrepository.liverpool.ac.uk/id/eprint/3169562 |
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