Table 1 Definitions and descriptions of parameters and measurements. Since all infants wore an eye protection during image acquisition, the point nasion was located centrally between the eyes and referred to as nasion*.
Definition | Description |
|---|---|
Measurement level (ML) | Head level with the major anterior–posterior expansion of the head |
Head circumference (HC; cm) | Head perimeter around the ML |
Cranial volume (CV; m3) | Total head volume cranial to the sagittal plane |
Cranial index (CI; %) | Proportion of head width to length at ML Formula: \(CI=\frac{head~widht}{head~lenght}\times 100\) |
Cranial vault asymmetry index (CVAI; %) | Difference between the longest (diagonal A) and shortest 30° diagonal (diagonal B) diameter radiating from the midsagittal plane at ML Formula: \(CVAI=\frac{diagonal~A - diagonal~B}{major~diagonal}\times 100\) |
