Ultrasound Investigation of Tongue Movement During Vowels Articulation
| Autor: | Yeh, Frank Wei-Chang, 葉為昌 |
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| Rok vydání: | 2000 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 88 Many dentists, orthodontists, oral surgeons, ENT doctors, neurologists, physiologists and speech pathologists are interested in the research field of tongue movement during articulation. One of the common reasons for speech distortion or dysphasia in patients is abnormal tongue movements. Irregardless of whether the reasons for the abnormal tongue movements are natural or acquired, most patients’ pronunciation is improved by tongue rehabilitation surgery, tongue myofunctional exercises and speech therapies. In order to understand the mechanisms of physiological, pathological and rehabilitated tongue functions, it is necessary to develop a more suitable method for diagnosis and research of tongue movement during pronunciation. Traditional research techniques, such as cineradiography, as well as electrical magnetic and electromyography, have many draw backs in researching tongue movements. Ultrasonic investigation is a modern method, and it has the advantages of easy operation, 2-D dynamic frames and non-invasiveness. Furthermore, by the recently developed oral cushion scanning technique (CST), ultrasound can provide quantitative information on tongue movement, and it has been noticed by the relative researchers. The purpose of this study is to use the cushion scanning technique to investigate and quantify movement patterns of the tongue, as well as to serve as the basis for future research. To obtain normative data of tongue motion with this system, 32 normal-hearing native adult speakers were chosen. Those with no dysphagia, dysphasia or dysphonia, as well as having no oral-motor, dental, articulatory, structural, or rhythmic impairments that could alter tongue function were selected as subjects. Totally 16 males and 16 females spanning young adulthood from 19 to 27 years of age were included in this study. Each individual was asked to pronounce each vowel according to the word on the paper shown, and to read each [a], [e], [i], [o] and [u] three times in their habitual phonation. A 3.5 MHz mechanical sector transducer was used as the ultrasonic scanning probe under CST condition, to capture mid-sagittal images of the tongue during vowel articulation. The images, observed in ultrasonic B+M mode, were recorded with a high quality video recorder and stored in computer through a frame grabber card for analysis. The results show that the average duration of tongue movement in vowel articulation by normal male adults was [a], 2.31 ± 0.39; [e], 2.32 ± 0.41; [i], 2.25 ± 0.46; [o], 2.48 ± 0.34; and [u], 2.37 ± 0.39 seconds. The average amplitude of tongue movement in vowel articulation by normal male adults was [a], 9.13 ± 3.21; [e], 5.48 ± 1.78; [i], 6.02 ± 2.92; [o], 13.26 ± 4.60; and [u], 7.17 ± 2.43 mm. The average duration of tongue movement in vowel articulation by normal female adults was [a], 2.47 ± 0.50; [e], 2.63 ± 0.41; [i], 2.52 ± 0.45; [o], 2.44 ± 0.34; and [u], 2.51 ± 0.47 seconds. The average amplitude of tongue movement in vowels articulation by normal female adults was [a], 6.29 ± 2.07; [e], 8.96 ± 3.63; [i], 7.22 ± 3.98; [o], 9.25 ± 3.97; and [u], 6.04 ± 2.57 mm. Real time mid-sagittal ultrasound images of tongue, with the help of the B+M mode, make the oral ultrasound investigation a more powerful and more precisely diagnostic method in phonology and speech pathology. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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