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At least 73 records · Page 4Linked to original sources
PubMed1998

Ceptral voice analysis: link with perception and stroboscopy.

The cepstrum peak magnitude of a /a:/ becomes reduced when either low or high frequency noise increases. In 18 normal subjects and 68 dysphonic patients, perceptual rating according to the GRBAS--system, cepstrum analysis, videostroboscopic vibration pattern quantification, phonation flow measurement, and multidimensional voice analysis was performed. Factor analysis demonstrates that the cepstrum peak magnitude indeed is sensitive to aperiodicity of vocal fold vibration as well as to insufficient vocal fold closure and excessive turbulent noise escape, and that it may be considered as a relevant acoustic correlate for the G (Grade) parameter of the GRBAS scale.

Adult↗
PubMed2003

Stroboscopic observation of vocal fold vibration with the videoendoscope.

Asahi Optical Co, Ltd (Tokyo, Japan), has manufactured a trial thin videoendoscope with an instantaneous RGB (red-green-blue) system. We have developed a new laryngostroboscopic system using this videoendoscope. In this article, we report the performance of the clinical trial of this new and useful videoendoscopic system for stroboscopy, and compare it to conventional stroboscopy using a flexible fiberscope or rigid endoscope. This new thin videoendoscope has the following characteristics. A small charge-coupled device (CCD) chip is built into the tip of this endoscope, and an instantaneous RGB system is used. The outer diameters of its tip (4.1 mm) and the insertion tube (3.7 mm) of the videoendoscope are relatively small. The videoendoscope system is compact. Stroboscopic observation was conducted with this videoendoscope in conjunction with a laryngostroboscope. Compared to stroboscopy with a conventional flexible fiberscope or rigid endoscope, this stroboscopic system has several clear advantages. It presents clear dynamic color images on a color video monitor and provides excellent resolution and recording, thus yielding high diagnostic accuracy. The diameter of the videoendoscope is relatively small and results in less discomfort for patients, even for children. The videoendoscope allowed the doctors to perform pernasal endoscopy. Therefore, there is less limitation in the range of subjects for examination. Patients are able to phonate holding a normal head position, and are thereby able to produce varying vocal sounds in the habitual or normal manner during examination. The new stroboscopy system using a videoendoscope is a very useful examination tool that has the advantages of both a conventional flexible fiberscope and a rigid endoscope.

Adolescent↗
PubMedDate not supplied

Multidimensional voice evaluation in pretreatment glottic carcinoma.

It is generally accepted that, in glottic carcinoma, the voice will deteriorate, even in the early stages. This paper reports the degree of hoarseness and multidimensional vocal evaluation of glottic carcinoma patients. Forty-seven male glottic carcinoma patients and a control group of 13 normal subjects were included in this study involving psychoacoustic evaluation by doctors, acoustic analysis, phonogram, maximum phonation time and stroboscopy before treatment. A normal voice or mild hoarseness by psychoacoustic evaluation was found in 35% of cases with T1 and T2 glottic carcinoma. Patients with psychoacoustically inferior vocalization had high scores on acoustic analysis, small phonogram areas, and short maximum phonation time. Stroboscopy revealed attenuation or disappearance of the mucosal wave on the tumor side in all cases, whether the acoustic analysis data were within or beyond the normal limits. We identified two conditions offering superior vocalization in glottic carcinoma patients: (1) the lesion should be unilateral, and (2) the lesion should be flat with no protrusion. We should evaluate patients with glottic carcinoma not only with vocal examination but also using stroboscopy before biopsy.

Adult↗
PubMed2001

Transillumination laryngoscopy: a new way of evaluating vocal fold and hypopharyngeal lesions.

Conventional methods of observing the larynx and the hypopharynx use reflected light to illuminate the larynx. The aim of this study was to see whether transilluminating the larynx was possible in subjects with and without disease. The larynx and the hypopharynx were observed by means of a rigid scope with a low-light charge-coupled device camera without the light guide inserted. Illumination was provided by a second rigid scope attached to a light source that was held at the neck by an assistant. The larynx and hypopharynx were observed by transillumination using both constant lighting and stroboscopy in 3 subjects with pharyngeal or laryngeal lesions and in 4 normal controls. The tumors were translucent or nontranslucent in appearance. A translucent polyp became nontranslucent when overlapping the vocal fold, thus indicating that a lesion the size of a polyp could be evaluated with this method. Mucosal waves could be observed during stroboscopy with transillumination, thus allowing observation of waves and lesions that cannot be observed with conventional stroboscopy.

Adult↗
PubMed1986

[Videostroboscopy of the larynx].

The technique of telescopic videostroboscopy permits simultaneous audio and video recording of a laryngoscopy and a subsequent stroboscopy of the larynx during the same examination. The combination of laryngoscopy and stroboscopy is very favorable not only because stroboscopy is not possible in all pathological cases, but also because each of both methods can reveal facts the other does not. In addition, the possibility of playing back the video tapes as often as desirable is an important diagnostic and pedagogic advantage.

Adult↗
PubMed2005

Common practices of voice therapists in the evaluation of patients.

This study surveys voice therapists regarding common diagnostic practices in patients referred for therapy with the diagnosis of muscle tension dysphonia (broadly defined as the "hyperfunctional" component of the dysphonia). Through postings on the e-mail list of the ASHA special interest division on voice, speech pathologists with at least 3 years' experience in stroboscopy and acoustic instrumentation were invited to complete the survey. Results from 53 completed surveys demonstrated that voice quality and patient self-perception are the sole assessments performed by all therapists. Voice quality, observation of body posture and movement, and probing the patient's ability to alter voice production are each significantly more likely to be performed than the more objective stroboscopic, acoustic, aerodynamic, and EGG assessments. Further, the tasks of defining specific therapy session goals and helping the patient to achieve a particular target skill are considered best served by measures of vocal quality, observation of body position and movement, and judging the patient's ability to alter voice production. For definition of the overall therapy goal, stroboscopy and patient perception scales are added to all of the subjective assessment measures as being important. Acoustic data are considered most important for patient reinforcement and outcomes assessment. Implications of these findings are discussed, and topics for further exploration are identified.

Data Collection↗
PubMed1994

Aerodynamic and stroboscopic findings before and after microlaryngeal phonosurgery.

Acoustic, aerodynamic, and laryngo-video-stroboscopy (LVS) studies were done on 50 patients before and after microlaryngeal surgery for benign vocal fold lesions. Perceptual pre- and postratings were also obtained. After microlaryngeal surgery, statistically significant differences between pre- and posttreatment conditions included postoperative findings of (a) a lowering of mean flow rate, (b) an increase in glottal efficiency, and (c) an increase in maximum sound pressure level. There was no significant improvement in maximum phonation time. Stroboscopy findings showed changes of glottal configuration, linearity of the vocal fold edge, amplitude of vocal fold vibration, excursion of the mucosal wave, and periodicity. Acceptable perceptual voice quality appeared to depend on a straight vocal fold edge, good vibratory amplitude, and good mucosal wave. Improved understanding of vocal function after phonosurgery should help us refine surgical principles and techniques. The combined use of LVS and phonatory function measures is advocated.

Glottis↗