Evaluation of facial palsy by moire topography

Ikuo Inokuchi; Shinichiro Kawakami; Manabu Maeta; Yu Masuda

doi:10.1117/12.44654

1 August 1991 Evaluation of facial palsy by moire topography

Ikuo Inokuchi, Shinichiro Kawakami, Manabu Maeta, Yu Masuda

Proceedings Volume 1429, Holography, Interferometry, and Optical Pattern Recognition in Biomedicine; (1991) https://doi.org/10.1117/12.44654
Event: Optics, Electro-Optics, and Laser Applications in Science and Engineering, 1991, Los Angeles, CA, United States

Abstract

Society of Facial Research is used frequently. It is of great value clinically, but the method has several weak points concerning objective and quantitative assessment. This study uses moire topography to solve these problems. mA moire camera, FM3013, of the lattice irradiation type was used for measurement of the face. Five moire photographs were taken: at rest, wrinkling the forehead, closing the eyes lightly, blowing out the cheeks and grinning. The degree of facial palsy was determined by the Asymmetry Index (AI) as a measure of the degree of facial deviation. Total AI was expressed as the average AI based on calculations of the measurement in 5 photos. Severe paralysis is represented by an AI of more than 20%. Partial paralysis has a range of 20-8%. Nearly normal is judged to be less than 8%. Ten normal individuals are measured as control and show an AI of 3% or less. Moire topography is useful in assessing the recovery process because it has the benefit of making the site and grade of palsy easily achieved by the AI and the deviation in its patterns. The authors propose that the moire method is better for an objective and quantitative evaluation than the society's method.

Citation Download Citation

Ikuo Inokuchi, Shinichiro Kawakami, Manabu Maeta, and Yu Masuda "Evaluation of facial palsy by moire topography", Proc. SPIE 1429, Holography, Interferometry, and Optical Pattern Recognition in Biomedicine, (1 August 1991); https://doi.org/10.1117/12.44654

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