Accuracy of Cranial Shape Measurements Using Smartphones: A Prospective Study

Area of Science:

• Pediatric medicine
• Medical technology
• Biomedical engineering

Background:

• Deformational plagiocephaly and/or brachycephaly (DPB) are common infant head shape conditions.
• Accurate diagnosis and monitoring are crucial for effective treatment.
• Traditional measurement methods using calipers can be cumbersome and less precise.

Purpose of the Study:

• To prospectively validate smartphone-based digital cranial measurements for diagnosing and treating DPB.
• To compare the accuracy of digital measurements against standard caliper measurements.
• To assess the feasibility of using digital tools for DPB management in clinical and home settings.

Main Methods:

• Smartphone-captured head photos and caliper measurements were taken from 71 infants (aged 2-11 months) with DPB.
• Cranial index (CI), cranial vault asymmetry index (CVAI), and cranial vault asymmetry (CVA) were calculated.
• Measurements were compared to 3D photogrammetry (ground truth) using mean absolute error, correlation coefficients, and Bland-Altman analysis.

Main Results:

• Smartphone measurements showed high correlation with 3D ground truth (CI: 0.90, CVAI: 0.94, CVA: 0.80).
• Mean absolute errors for smartphone measurements were comparable or lower than caliper measurements for CVAI and CVA.
• Smartphone CI measurements were significantly more accurate than caliper measurements (p=0.04).

Conclusions:

• Smartphone-based digital cranial measurements are accurate and reliable for DPB diagnosis and treatment.
• Digital measurements offer a viable, comparable, or superior alternative to traditional caliper use.
• This technology facilitates early detection and management of DPB in pediatric settings and at home.