Reproducibility of the dynamics of facial expressions in unilateral facial palsy
| Autor: | Mahmoud Amir Alagha, Stephen Morley, Xiangyang Ju, Ashraf Ayoub |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Adult
Male Facial Paralysis 03 medical and health sciences Imaging Three-Dimensional 0302 clinical medicine medicine Humans 030223 otorhinolaryngology Aged Orthodontics Reproducibility Facial expression business.industry Reproducibility of Results 030206 dentistry Middle Aged medicine.disease Facial paralysis Expression (mathematics) Facial Expression Facial muscles stomatognathic diseases Cross-Sectional Studies medicine.anatomical_structure Otorhinolaryngology Unilateral facial palsy Face (geometry) Female Surgery Oral Surgery Procrustes analysis business |
| ISSN: | 0901-5027 |
| Popis: | The aim of this study was to assess the reproducibility of non-verbal facial\ud expressions in unilateral facial paralysis using dynamic four-dimensional (4D)\ud imaging. The Di4D system was used to record five facial expressions of 20 adult\ud patients. The system captured 60 three-dimensional (3D) images per second; each\ud facial expression took 3–4 seconds which was recorded in real time. Thus a set of\ud 180 3D facial images was generated for each expression. The procedure was\ud repeated after 30 min to assess the reproducibility of the expressions. A\ud mathematical facial mesh consisting of thousands of quasi-point ‘vertices’ was\ud conformed to the face in order to determine the morphological characteristics in a\ud comprehensive manner. The vertices were tracked throughout the sequence of the\ud 180 images. Five key 3D facial frames from each sequence of images were\ud analyzed. Comparisons were made between the first and second capture of each\ud facial expression to assess the reproducibility of facial movements. Corresponding\ud images were aligned using partial Procrustes analysis, and the root mean square\ud distance between them was calculated and analyzed statistically (paired Student ttest,\ud P < 0.05). Facial expressions of lip purse, cheek puff, and raising of eyebrows\ud were reproducible. Facial expressions of maximum smile and forceful eye closure\ud were not reproducible. The limited coordination of various groups of facial muscles\ud contributed to the lack of reproducibility of these facial expressions. 4D imaging is a\ud useful clinical tool for the assessment of facial expressions. |
| Databáze: | OpenAIRE |
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