Hiroshi Imagawa

Articles

Relationship of Various Open Quotients With Acoustic Property, Phonation Types, Fundamental Frequency, and Intensity
Journal of Voice (2016) Vol. 30, No. 2, pp. 145-157

In the present study, we examined the relationship between various open quotients (Oqs) and phonation types, fundamental frequency (F0), and intensity by multivariate linear regression analysis (MVA) to determine which Oq best reflects vocal fold vibratory characteristics. Using high-speed digital ...

Quantification of Vocal Fold Vibration in Various Laryngeal Disorders Using High-Speed Digital Imaging
Journal of Voice (2016) Vol. 30, No. 2, pp. 205-214

Objective: To quantify vibratory characteristics of various laryngeal disorders seen by high-speed digital imaging (HSDI). HSDI was performed on 78 patients with various laryngeal disorders (20 with polyp, 16 with carcinoma, 13 with leukoplakia, 6 with vocal fold nodule, and ...

Quantitative Analysis of Digital Videokymography: A Preliminary Study on Age- and Gender-Related Difference of Vocal Fold Vibration in Normal Speakers
Journal of Voice (2015) Vol. 29, No. 1, pp. 109-119

Kymography is an effective method for assessing temporal patterns of vocal fold vibrations. Because kymographic data for a number of normal speakers based on high-speed digital imaging (HSDI) were limited in the literature, this prospective study was conducted to provide ...

Vocal Fold Vibration in Vocal Fold Atrophy: Quantitative Analysis With High-Speed Digital Imaging
Journal of Voice (2015) Vol. 29, No. 6, pp. 755-762

Vocal fold vibrations of vocal fold atrophy (VFA), a rapidly increasing voice disorder owing to worldwide societal aging, have not been clarified by high-speed digital imaging (HSDI). The HSDI method was performed on 46 patients (33 males and 13 females) ...

Vocal Fold Atrophy in a Japanese Tertiary Medical Institute: Status Quo of the Most Aged Country
Journal of Voice (2014) Vol. 28, No. 2, pp. 231-236

Voice problems in the geriatric population are increasing worldwide. Since the demographic research of geriatric voice patients in Japan, the country of the most advanced Aging Society, is missing, the authors assessed the current trend of geriatric voice patients, especially ...

Phase Difference of Vocally Healthy Subjects in High-Speed Digital Imaging Analyzed With Laryngotopography
Journal of Voice (2013) Vol. 27, No. 1, pp. 39-45

Background: To elucidate the vibratory patterns of the vocal folds in normophonic subjects, we conducted a prospective study with laryngotopography, an analyzing technique for high-speed digital imaging to intuitively grasp spatial characteristics of vocal fold vibrations by pixel-wise discrete Fourier ...

Evaluation of Vocal Fold Vibration With an Assessment Form for High-Speed Digital Imaging: Comparative Study between Healthy Young and Elderly Subjects
Journal of Voice (2012) Vol. 26, No. 6, pp. 742-750

Objectives/Study Design: We conducted a prospective study with a subjective assessment form for high-speed digital imaging (HSDI) to elucidate the features of vocal fold vibrations in vocally healthy subjects and to clarify gender- and age-related differences. Methods: Healthy adult volunteers ...