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Interhemispheric differences in regional density of the normal brain.

J A Coffman, S Bloch

    Journal of Psychiatric Research
    |January 1, 1984
    PubMed
    Summary
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    Lateralized hemispheric density differences in the brain are not caused by bone-related beam hardening during computed tomography (CT) scans. These density variations likely stem from inherent structural differences between brain hemispheres.

    Area of Science:

    • Neuroimaging
    • Radiology
    • Human Anatomy

    Background:

    • Computed tomography (CT) imaging can reveal regional variations in cerebral X-ray attenuation.
    • Lateralized hemispheric density differences have been observed in brain CT scans.
    • Beam hardening, an artifact in CT imaging related to bone, is a potential factor influencing these density variations.

    Purpose of the Study:

    • To investigate the relationship between bone-related beam hardening and lateralized hemispheric density differences in the brain.
    • To determine if X-ray attenuation variations in cerebral tissues are influenced by skull thickness and beam hardening effects.

    Main Methods:

    • Evaluated CT scans from 22 normal, right-handed individuals.
    • Calculated regional mean X-ray attenuation values and regional left-right differences in attenuation.

    Related Experiment Videos

  • Correlated these attenuation differences with regional measurements of skull thickness.

    • Main Results:

    • A statistically insignificant number of significant correlations were found between hemispheric density differences and skull thickness.
    • Observed left-right hemispheric density differences were not attributable to beam hardening through bone.
    • These density differences persisted across all evaluated brain slices.

    Conclusions:

    • Bone-related beam hardening is not the cause of observed lateralized hemispheric density differences in CT scans.
    • The persistent nature of these density differences suggests they arise from inherent structural variations between the brain's hemispheres.