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Quantitative Assessment Protocol for Facial Soft Tissue Volumetric Changes with Stereophotogrammetry

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Development of a new evaluation method for cheek sagging using a Moire 3D analysis system.

Naoko Saito¹, Takafumi Nishijima, Tsutomu Fujimura

¹Biological Science Laboratories, Kao Corporation, Tochigi, Japan. saito.nao@kao.co.jp

Skin Research and Technology : Official Journal of International Society for Bioengineering and the Skin (ISBS) [And] International Society for Digital Imaging of Skin (ISDIS) [And] International Society for Skin Imaging (ISSI)

|January 23, 2009

Summary

This study introduces a new Moire 3D analysis method to accurately measure subtle facial sagging. The technique effectively tracks skin displacement, correlating with age and visual sag scores.

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Area of Science:

Dermatology
Biomedical Engineering
Medical Imaging

Background:

Facial sagging is a common aging concern.
Existing measurement methods have limitations, especially for early-stage sagging.
A novel, non-invasive approach is needed to quantify subtle changes.

Purpose of the Study:

To develop and validate a new method for measuring facial skin sagging.
To overcome the limitations of current techniques in detecting early or slight sagging.
To correlate objective measurements with age and visual assessment.

Main Methods:

Utilized Moire 3D imaging to capture cheek topography.
Marked 14 points on the cheek and recorded their 3D coordinates.
Analyzed skin surface displacement between frontward and downward facial positions.
Compared displacement data with subject age and visual sag scores.

Main Results:

Moire 3D analysis showed strong correlations between skin displacement, age, and visual sag scores.
The method detected characteristic sagging differences between women in their 60s and 70s.
Objective measurements aligned with subjective visual impressions of sagging.

Conclusions:

Moire 3D analysis provides a sensitive, comfortable, and objective method for assessing facial skin sagging.
This technique can detect slight, continuous, and characteristic changes in sagging.
The findings support the utility of this method in dermatological research and clinical practice.