Measurement: The head’s maximum width (biparietal diameter) and maximum length (occipital-frontal diameter) are measured in centimeters.
Calculation: The cephalic index is calculated by dividing the maximum width of the head by its maximum length and multiplying by 100:Cephalic index = (Maximum width / Maximum length) x 100
Classification: The cephalic index is used to classify head shapes into different categories:
Dolichocephaly (CI < 75): Long and narrow head shape
Mesocephaly (75 ≤ CI ≤ 80): Intermediate head shape
Brachycephaly (CI > 80): Short and broad head shape
The Cranial Vault Index (CVI) is calculated as follows:
Measurement: The head’s maximum length (occipital-frontal diameter), maximum width (biparietal diameter), and maximum height (occipital-vertex diameter) are measured in centimeters.
Calculation: The Cranial Vault Index is calculated by dividing the volume of the head by the product of the maximum length, width, and height:CVI = (Volume of the head) / (Maximum length x Maximum width x Maximum height)
Interpretation: The Cranial Vault Index is used to evaluate the shape of the cranial vault, which is the top part of the skull. A higher Cranial Vault Index indicates a more rounded cranial vault shape, while a lower Cranial Vault Index indicates a more elongated or flattened cranial vault shape. The Cranial Vault Index can be used to diagnose and monitor conditions such as craniosynostosis, plagiocephaly, and brachycephaly.
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