Assessment of factors that confound MRI and neuropathological correlation of human postmortem brain tissue.
In spite of considerable technical advance in MRI techniques, the optical resolution of these methods are still limited. Consequently, the delineation of cytoarchitectonic fields based on probabilistic maps and brain volume changes, as well as small-scale changes seen in MRI scans need to be verified by neuronanatomical/neuropathological diagnostic tools. To attend the current interdisciplinary needs of the scientific community, brain banks have to broaden their scope in order to provide high quality tissue suitable for neuroimaging- neuropathology/anatomy correlation studies. The Brain Bank of the Brazilian Aging Brain Research Group (BBBABSG) of the University of Sao Paulo Medical School (USPMS) collaborates with researchers interested in neuroimaging-neuropathological correlation studies providing brains submitted to postmortem MRI in-situ. In this paper we describe and discuss the parameters established by the BBBABSG to select and to handle brains for fine-scale neuroimaging-neuropathological correlation studies, and to exclude inappropriate/unsuitable autopsy brains. We tried to assess the impact of the postmortem time and storage of the corpse on the quality of the MRI scans and to establish fixation protocols that are the most appropriate to these correlation studies. After investigation of a total of 36 brains, postmortem interval and low body temperature proved to be the main factors determining the quality of routine MRI protocols. Perfusion fixation of the brains after autopsy by mannitol 20% followed by formalin 20% was the best method for preserving the original brain shape and volume, and for allowing further routine and immunohistochemical staining. Taken to together, these parameters offer a methodological progress in screening and processing of human postmortem tissue in order to guarantee high quality material for unbiased correlation studies and to avoid expenditures by post-imaging analyses and histological processing of brain tissue.
Department of Pathology, University of São Paulo Medical School, São Paulo, Brazil.
Lea T
LT
Grinberg
Edson
E
Amaro
Stefan
S
Teipel
Denis Dionizio
DD
dos Santos
Carlos Augusto
CA
Pasqualucci
Renata E P
RE
Leite
Celia Regina
CR
Camargo
Jaqueline Alba
JA
Gonçalves
Ariadne Gonçalves
AG
Sanches
Miriam
M
Santana
Renata E L
RE
Ferretti
Wilson
W
Jacob-Filho
Ricardo
R
Nitrini
Helmut
H
Heinsen
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001921:Brain / Q000473:pathology*; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D011180:Postmortem Changes; D013048:Specimen Handling / Q000379:methods; D013997:Time Factors; D014015:Tissue Banks; D016707:Tissue Fixation / Q000379:methods; D014021:Tissue Preservation / Q000379:methods