• Journal of the Korean Society of Laryngology, Phoniatrics and Logopedics
• /
• v.3 no.1
• /
• pp.22-28
• /
• 1989

Laryngostroboscopy is one of the most practical techniques for clinical examination of the larynx. The videostroboscopy provides valuable information concerning the nature of vocal folds' vibration, an immediate image of the presence or absence of pathology, and a permanent record. Additionally, when used by trained observers in conjunction with other instrumentation, it can provide both qualitative and quantitative data on vocal function of both the normal and disordered larynx. The authors examined the 388 patients with voice disorders by videostroboscope. This paper describes the clinical procedure of laryngostroboscopy based on some introductory remarks on laryngeal anatomy and function. And the findings of parameters observed by the stroboscopy is noted for the laryngeal disorders.

• Proceedings of the KSLP Conference
• /
• 1994.06a
• /
• pp.110-116
• /
• 1994

보통사람의 성대는 일상회화중 1초에 100∼300번의 진동을 하며 노래를 하는 경우는 1,000번 이상도 진동하게 되므로 우리의 유안으로는 그 자세한 진동상태를 관찰할 수가 없어 특수한 기기를 사용해야만 한다. 현재로서 사용되는 특수기기로는 후두스트로보스코피(laryngostroboscopy), 초고속영화법(ultra high speed photography), 그로토그라피(glottography) 및 카이모그라피(kymography) 등이 있다. 이 중 초고속영화법은 1초에 3,000회 이상의 성대진동을 촬영할 수 있어 연구 및 교육에 대단히 유용한 기기이나 가격이 비싸고 그 data를 분석하는데 시간이 많이 걸려 일반임상검사로서는 부적당하며 그로토그라피는 성대자체를 직접 관찰하는 것이 아니고 그 관측결과를 그래프로 나타내주는 기기로서 에에는 초음파, 광전 및 전기를 이용한 방법등이 있다. (중략)

• Journal of the Korean Society of Laryngology, Phoniatrics and Logopedics
• /
• v.8 no.2
• /
• pp.225-231
• /
• 1997

The persistent and recurrent dysphonia after microlaryngeal surgery was noted in tweleve patients. We reviewed the results of laryngostroboscopy, psychoacoustic evaluation, aerodynamic study and acoustic analysis according to the treatment modality. The causes of persistent dysphonia were attributed to vocal cord scarring, recurrent mass lesion, residual mass lesion, persistent inflammation, and hyperfunctional voice disorder. We noticed the better vocal function in the group treated with voice therapy or surgical therapy than the group treated with voice rest and medication. Therefore, we concluded that vocal function can be improved with the use of active, multidisciplinary approach which includes voice therapy, medical treatment and selected surgical resection according to the laryngeal lesions.

• Proceedings of the KSLP Conference
• /
• 1994.06a
• /
• pp.117-127
• /
• 1994

사람의 성대는 일상회화중 1초에 100∼300번 진동하며 노래를 부를 때에는 100번 이하 또는 1,000번 이상까지 진동하게되므로 우리의 육안으로는 그 자세한 진동상태를 관찰할 수 가 없다. 따라서 이런 경우의 성대 진동상태를 관찰하려면 특수한 검사기기를 사용해야한다. 현재 사용되고 있는 검사법으로는 후두스트로보스코피(laryngostroboscopy), 초고속영화촬영(ultra high speed cinematography), 그로토그라피(glottoraphy) 및 카이모그라피(kymography) 등이 있다. (중략)

• Journal of the Korean Society of Laryngology, Phoniatrics and Logopedics
• /
• v.18 no.2
• /
• pp.122-128
• /
• 2007

This study aims to analyze the voices of the patients with voice disorders including vocal fold paralysis, vocal fold cyst and vocal nodule/polyp in the aspect of acoustic phonetics. This study intends to collect subsidiary acoustic data in order to make a speech treatment and an standardization of vocal disorders. Subjects and Methods: The subjects of this study were 64 adult patients who underwent indirect laryngoscopy and laryngostroboscopy, and were diagnosed as vocal fold paralysis, vocal fold cyst or vocal nodule/polyp. Experimental group consisted of 20 patients who were diagnosed as vocal fold paralysis, 21 patients who were diagnosed as vocal fold cyst and had the average age of 42.0 $({\pm}10.03)$ ; and 23 patients who were diagnosed as vocal nodule/polyp and had the average age of 40.9 $({\pm}13.75)$. For the methodology of this study, the patients listed above were asked to sit in a comfortable position at intervals of 10cm apart from the patient's mouth and a microphone, and subsequently to phonate a vowel sound /e/ for the maximum phonation time with natural tone and vocal volume then the sound was directly inputted on a computer. During recording, sampling rate was set to 44,100Hz and the 1-second area corresponding to stable zone except the first and the last stage of waveform of the vowel sound /e/ vocalized by the individual patients was analyzed. Results: First, there was no statistically significant difference in jitter and shimmer between vocal fold paralysis and vocal fold cyst, while there was highly statistically significant difference in them between vocal fold paralysis and vocal nodule/polyp. Second, looking into the mean values obtained from NNE, HNR and SNR results associated with noise ratio, the disease showing the most abnormal characteristics was vocal fold paralysis, followed by cyst and nodule/polyp in order. For NNE, there was statistically significant difference between vocal nodule/polyp, and cyst or paralysis. In other words, it was found that the NNE of vocal nodule/polyp was weaker than that of cyst or paralysis. Similarly, HNR and SNR also showed the same characteristics; there was statistically significant difference between vocal fold paralysis and vocal fold cyst or nodule/polyp, and HNR and SNR values of vocal fold paralysis were lower than those of vocal fold cyst or nodule/polyp. Conclusion: For vocal fold paralysis, the abnormal values of acoustic parameters associated with frequency, amplitude and noise ratio were statistically significantly higher than those of vocal fold cyst and nodule/polyp. This finding suggests that the voices of the patients with vocal fold paralysis are the most severely injured due to less stability of vocal fold movement, asymmetry and incomplete glottic closure. In addition, there was no statistically significant difference in the acoustic parameters of tremor among vocal fold paralysis, vocal fold cyst and vocal nodule/polyp. Further studies need to ascertain reasonable acoustic parameters with various vocal disorders as well as to clarify the correlation between acoustics-based objective tools and subjective evaluations.