Parametric mapping and quantitative analysis of the human calvarium

Area of Science:

• Anatomy
• Biomedical Engineering
• Anthropology

Background:

• Previous studies on human skull thickness and density had limited data due to small sample sizes and few measurement sites.
• Sparse literature data hinders comprehensive understanding of calvarium variations.

Purpose of the Study:

• To investigate the spatial variation of thickness and density across the human calvarium region.
• To analyze these variations in detail using a large dataset and advanced in silico methods.
• To establish a detailed understanding of individual skull characteristics.

Main Methods:

• Collected computer tomography (CT) scans from 51 ex vivo human calvaria.
• Performed in silico analysis with over 2000 measurement sites per skull.
• Calculated thickness and density for individual skull layers and combined, mapping variations onto skull surfaces.

Main Results:

• Significant spatial variations in thickness and density were observed across the calvarium.
• These variations were found to be unique descriptors for individual human skulls.
• The inner cortical layer's thickness exhibited the most variability, while outer cortical density was the least variable.

Conclusions:

• Human calvarium thickness and density display high inter-individual variability.
• Detailed spatial mapping reveals unique characteristics of each skull.
• Inner cortical thickness is a highly variable feature, contrasting with outer cortical density.