Microgravimetric analysis of human brain tissue: correlation with computerized tomography scanning

Area of Science:

• Neurosurgery
• Medical Physics
• Pathology

Background:

• Accurate assessment of tissue water content is crucial for diagnosing and understanding brain lesions.
• Computerized tomography (CT) provides imaging data but its correlation with tissue water content requires further investigation.

Purpose of the Study:

• To correlate microgravimetrically determined tissue water content with CT attenuation coefficients in various neurosurgical lesions.
• To investigate discrepancies between CT findings and actual water content in tumor and peritumoral tissues.

Main Methods:

• Microgravimetric analysis of 1-cubic millimeter tissue samples from 17 neurosurgical patients.
• Correlation of water content (H2O/gm tissue) with CT attenuation coefficients (EMI units).
• Comparison of water content in tumors, adjacent white matter, and normal brain tissue.

Main Results:

• Peritumoral white matter in glioblastomas showed 5-8% higher water content than normal controls, correlating with low CT attenuation.
• Tumor water content did not always differ significantly from adjacent white matter, despite varying CT attenuation values.
• Low CT attenuation areas consistently indicated elevated water content, except in one case of arteriovenous malformation.

Conclusions:

• Low CT attenuation coefficients can indicate increased tissue water content, but this correlation is not absolute.
• Elevated water content in brain tissue may not always be detectable by changes in CT attenuation.
• Microgravimetry offers a direct measure of tissue water content, complementing CT imaging in neurosurgical contexts.