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Quantitative analysis of facial paralysis based on filters of concentric modulation | IEEE Conference Publication | IEEE Xplore

Quantitative analysis of facial paralysis based on filters of concentric modulation


Abstract:

Facial paralysis is a common disease occurring with annual patient rate of 25 to 35/100 000. The symptom of the disease is that the patients loose or decrease facial move...Show More

Abstract:

Facial paralysis is a common disease occurring with annual patient rate of 25 to 35/100 000. The symptom of the disease is that the patients loose or decrease facial movement ability. It is useful if there is an effective method to objective evaluation of facial paralysis degree. This paper presents a method to develop this tool based on filtered images. In our work, we propose a filter to extract useful isotropic frequencies of images in local spaces and remove unnecessary frequency components before feature extraction. The filter function is the modulation of an isotropic Gaussian function by a radial sinusoidal function. The interesting characteristic of this filter is that the passbands are the same for all orientations. This may be useful in some cases such as quantifying the degree of facial palsy. In this work, the measurement of symmetry and asymmetry between two sides of the face is performed on filtered images, and then the measured information is used for classification. Experiments have shown that with the use of our filtered technique, it gives superior results than the other methods testing on an available database of Osaka Police Hospital.
Date of Conference: 15-17 August 2015
Date Added to IEEE Xplore: 14 January 2016
ISBN Information:
Conference Location: Zhangjiajie, China

I. Introduction

Facial palsy is a disease caused by neural damage of the face. The patient is usually paralyzed or decreased ability of movement of their face on one side. Although they can recover from the condition, some sequelae may be left if the disease is not treated early and properly. For an effectiveness of treatment, a quantitative evaluation of the disease has to be performed so that the approximate treatment method [1] can be applied accordingly. In Japan, the Yanagihara grading system (YGS) [2] is largely used for medical diagnostics of facial palsy. In the YGS, for the patient, there are ten expressions to be required to perform. Each expression is assigned a score of 0 point (pt) for full palsy, of 2 (pts) for partial palsy, or of 4 (pts) for normal depending on how serious condition. The assignment of score from clinician is based on clinical observation and experience of clinicians. The total score for ten expressions is used for general diagnosis. A person is considered as a normal if he or she has the total score in the range from 36 (pts) to 40 (pts). Conversely, a patient is considered as a full palsy if he or she has the total score in the range from 0 (pts) to 8 (pts). Table I enumerates 10 expressions of YGS and approximate scores corresponding to serious levels of facial paralysis disease. Yanagihara grading system

Denote Expression Evaluation Score
Normal Partial palsy Full palsy
EP0 No expression 4 (pts) 2 (pts) 0 (pts)
EP1 Raising eyebrows
EP2 Closing eyes gently
EP3 Closing eyes tightly
EP4 Closing one eye
EP5 Screwing up nose
EP6 Puffing out cheeks
EP7 Moving toothy
EP8 Whistling
EP9 Turning down under lip

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References

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