The principles and advantages of foot 3D scanners and traditional podoscopes in measuring foot morphology, especially the arch, are significantly different and can be compared from the following aspects.
Principle of laser 3D scanner
Foot 3D scanners mainly use laser scanning technology to obtain the three-dimensional shape of the foot. The device emits a laser beam onto the plantar surface or the entire foot, and the sensor receives the reflected light, recording the time difference or displacement change from emission to return of the beam, thereby calculating the spatial coordinates of each point on the foot. By scanning multiple point clouds, the software reconstructs the foot surface into an accurate three-dimensional model, and then calculates arch height, width, and plantar pressure distribution through key point identification and curve fitting. High-end devices can also combine dynamic scanning to analyze the changes in arch load during standing or walking, providing more comprehensive foot data.
Principle of traditional podoscope
Traditional podoscopes observe plantar pressure and contours through a transparent or reflective flat mirror. During use, the subject stands on transparent glass or a mirror surface, and the observer looks at the plantar shape from underneath the mirror or displays pressure points through impressions or coloring. The podoscope mainly provides two-dimensional observation, cannot obtain precise three-dimensional height or curve data, and can only qualitatively judge arch height and medial arch changes.
Comparison of advantages
Advantages of laser 3D scanner:
- High accuracy: Can quantify arch height, curve, and area ratio, with errors less than a millimeter.
- Three-dimensional reconstruction: Not only measures the plantar surface but also captures the three-dimensional shape of the entire foot.
- Dynamic analysis: Can record plantar pressure changes during standing and walking, providing a more scientific assessment of functional issues.
- Data storage and analysis: Facilitates custom insoles, rehabilitation plans, and long-term tracking.
Advantages of traditional podoscope:
- Simple operation, low cost, no complex equipment required.
- Can quickly observe plantar pressure distribution and abnormal morphology, suitable for preliminary screening.
- Does not rely on electricity or software, convenient for on-site use.
Laser 3D scanners far surpass traditional podoscopes in precision measurement, three-dimensional reconstruction, and dynamic analysis, while podoscopes are suitable for quick, low-cost preliminary observation and screening.
