Effects of formalin fixation on polarimetric properties of brain tissue: fresh or fixed?
Mueller polarimetry
brain tissue
formalin fixation
image segmentation
neuropathology
neurosurgery
Journal
Neurophotonics
ISSN: 2329-423X
Titre abrégé: Neurophotonics
Pays: United States
ID NLM: 101632875
Informations de publication
Date de publication:
Apr 2023
Apr 2023
Historique:
received:
19
01
2023
revised:
16
03
2023
accepted:
01
05
2023
medline:
26
5
2023
pubmed:
26
5
2023
entrez:
26
5
2023
Statut:
ppublish
Résumé
Imaging Mueller polarimetry (IMP) appears as a promising technique for real-time delineation of healthy and neoplastic tissue during neurosurgery. The training of machine learning algorithms used for the image post-processing requires large data sets typically derived from the measurements of formalin-fixed brain sections. However, the success of the transfer of such algorithms from fixed to fresh brain tissue depends on the degree of alterations of polarimetric properties induced by formalin fixation (FF). Comprehensive studies were performed on the FF induced changes in fresh pig brain tissue polarimetric properties. Polarimetric properties of pig brain were assessed in 30 coronal thick sections before and after FF using a wide-field IMP system. The width of the uncertainty region between gray and white matter was also estimated. The depolarization increased by 5% in gray matter and remained constant in white matter following FF, whereas the linear retardance decreased by 27% in gray matter and by 28% in white matter after FF. The visual contrast between gray and white matter and fiber tracking remained preserved after FF. Tissue shrinkage induced by FF did not have a significant effect on the uncertainty region width. Similar polarimetric properties were observed in both fresh and fixed brain tissues, indicating a high potential for transfer learning.
Identifiants
pubmed: 37234458
doi: 10.1117/1.NPh.10.2.025009
pii: 23005GR
pmc: PMC10207713
doi:
Types de publication
Journal Article
Langues
eng
Pagination
025009Informations de copyright
© 2023 The Authors.
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