An optical flow-based speckle tracking algorithm to track the dynamic motion of tongue base in ultrasound image

  • 簡 芝?

Student thesis: Doctoral Thesis

Abstract

Obstructive sleep apnea (OSA) a breathing disorder characterized by repetitive collapse of the pharyngeal airway during sleep can cause intermittent hypoxemia and frequent arousal Several studies have demonstrated that the deformation of tongue base plays an important role in OSA In our previous study tongue base thickness (TBT) was measured as a significant index by ultrasound image to identify the person with or without OSA However TBT cannot provide the dynamic deformation of whole tongue base in detail Therefore the purpose of this study is to develop a suitable speckle tracking algorithm to track the dynamic motion of tongue base in ultrasound images Results were obtained from patients which can help physician to understand the anatomical change of tongue base The performance characteristics of proposed optical flow-based method was compared with block matching method which was commonly used for tissue motion tracking in both commercial ultrasonic phantom and synthetic data Calculation of error value and error ratio from the estimated displacement line indicate that proposed optical flow-based method exhibit a better accuracy than block matching method Finally in human experiment all subjects were required to perform the Mueller Maneuver (MM) to cause the temporal collapsibility of the tongue base The dynamic B-mode images were recorded during the subjects in the state from eupnea to the MM by a 3 5 MHz ultrasound array probe The ultrasonic probe was placed on the submental skin of the neck between the hyoid bone and the symphysis of the mandible The dynamic deformation of tongue base was tracked by the proposed optical flow-based method in continuous ultrasound image sequences Subsequently the dynamic deformation of tongue base with all-cared point during different states of the MM can be obtained The results obtained in the human experiments indicated that the motion of the normal group is large than the OSA group and that the tongue base motion near the hyoid bone is less than the motion near the mandible bone Future work will focus on collect more clinical data to analyze the human tongue base in aims to discover more clinical parameters
Date of Award2019
Original languageEnglish
SupervisorChih-Chung Huang (Supervisor)

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