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Use of MRI for measuring structures in frozen postmortem brain
D Longson1, C E Hutchinson, C A Doyle
1School of Biological Sciences, University of Manchester, UK.
Abstract:
A method was developed for magnetic resonance imaging (MRI) of human autopsy brains stored long-term at -70 degrees C. Scanning brains at temperatures between -70 and -8 degrees C gave minimal MRI signals consistent with protons having limited freedom of movement at low temperature. Raising brain temperature improved the signal such that scanning at -1 degree C generated images with good in-plane resolution, grey/white matter contrast, and fine detail of cortical sulcal/gyral patterns. To validate the method, volume and area measurements were made using computerized image analysis on stored digital images of 14 brains from adult subjects of both genders and various ages. The data confirmed that brain volume was inversely correlated with age, and female subjects had smaller brains. This is a valuable new method for acquiring morphometric data from previously unscanned pathologic brains that are to be used for neurochemical and molecular investigations.
Insights
Researchers developed a new magnetic resonance imaging (MRI) method for preserved human autopsy brains. This technique enables detailed brain imaging and morphometric analysis of previously inaccessible pathology specimens.
Area of Science:
- Neuroimaging
- Pathology
- Biomedical Engineering
Background:
- Long-term storage of human autopsy brains at -70°C presents challenges for traditional imaging techniques.
- Limited proton mobility at low temperatures results in minimal magnetic resonance imaging (MRI) signals.
- Developing methods to image preserved brain tissue is crucial for post-mortem neuropathological and molecular studies.
Purpose of the Study:
- To establish a reliable method for magnetic resonance imaging (MRI) of human autopsy brains stored long-term at -70°C.
- To optimize scanning parameters for improved image quality and morphometric data acquisition from preserved brain tissue.
- To validate the developed MRI method through quantitative analysis of brain volume and area.
Main Methods:
- A novel magnetic resonance imaging (MRI) protocol was developed for human autopsy brains preserved at -70°C.
- Brain samples were scanned at varying temperatures to determine optimal conditions for signal generation.
- Computerized image analysis was employed to measure brain volume and area from digital images of 14 adult subjects.
Main Results:
- Scanning at low temperatures (-70°C to -8°C) yielded minimal MRI signals due to restricted proton movement.
- Optimal MRI signals and image quality, including good resolution and grey/white matter contrast, were achieved at -1°C.
- Quantitative analysis confirmed an inverse correlation between brain volume and age, with female subjects exhibiting smaller brain volumes.
Conclusions:
- The developed MRI method allows for high-resolution imaging and morphometric analysis of long-term preserved human autopsy brains.
- This technique provides valuable data from previously inaccessible pathological specimens for neurochemical and molecular investigations.
- The findings demonstrate the feasibility of using preserved brain tissue for detailed neuropathological research.