Usefulness of Laryngeal Phonation CT in the Diagnosis of Vocal Cord Paralysis

Kim, Bum Soo; Ahn, Kook Jin; Park, Young Hak; Hahn, Seong Tai

doi:10.2214/ajr.07.2778

Cited by 22 publications

(12 citation statements)

References 11 publications

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“…Furthermore, simulations would have to be performed in patient-specific laryngeal models. In this regard, while the overall geometry of the lumen and the shape and size of the vocal folds can be obtained with reasonable accuracy from high-resolution CT scans (Jun et al, 2005;Kim et al, 2008), it is unlikely that patient-specific information regarding the layered internal structure can be extracted from these scans. Given this limitation, the only available option is to employ a model for the internal a) Author to whom correspondence should be addressed.…”

Section: Introductionmentioning

confidence: 99%

Sensitivity of vocal fold vibratory modes to their three-layer structure: Implications for computational modeling of phonation

Xue

Zheng

Bielamowicz

et al. 2011

The Journal of the Acoustical Society of America

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The sensitivity of the eigenmodes and eigenfrequencies of the human vocal fold to its three-layer structure is studied using finite-element modeling. The study covers a variety of three-dimensional vocal fold models ranging from an idealized, longitudinally uniform structure to a physiologically more realistic, longitudinally varying structure. Geometric parameters including the thickness of the ligament and cover layers as well as the ligament length are varied systematically. The results indicate that vocal fold vibratory modes are quite insensitive to the longitudinal variation in the thickness of the three layers as well as the variation in ligament length. However, significant overall changes in thickness of each layer can produce noticeable changes in these modes. The implications of these findings on computational modeling of phonation are discussed.

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Section: Introductionmentioning

confidence: 99%

Sensitivity of vocal fold vibratory modes to their three-layer structure: Implications for computational modeling of phonation

Xue

Zheng

Bielamowicz

et al. 2011

The Journal of the Acoustical Society of America

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“…8 In our study, evaluation of the larynx demonstrated limited or no motion in nearly all patients with both "eee" phonation and breath-hold techniques. Because scans were obtained starting at the skull base and extending inferiorly to the thoracic inlet, there was concern that images acquired at the end of the scanning acquisition would be degraded by motion as patients became fatigued.…”

Section: Discussionmentioning

confidence: 46%

“…4 More recent applications of phonation during CT imaging of the neck include evaluation of vocal cord paralysis. 8 Supplemental scanning increases the radiation dose to the patient and imaging time. In the past, these drawbacks have limited the widespread use of dynamic breathing maneuvers, despite studies that supported the usefulness of these techniques.…”

mentioning

confidence: 99%

Evaluating “Eee” Phonation in Multidetector CT of the Neck

Wear¹,

Allred²,

Mi³

et al. 2009

AJNR Am J Neuroradiol

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BACKGROUND AND PURPOSE:Since the advent of pharyngography, "eee" phonation has been used to distend the airway during imaging. When imaging shifted to axial CT, "eee" phonation was used to delineate mucosal anatomy better. However, because patients could not phonate for the entire examination (which could take several minutes), the technique was only useful during supplemental imaging, performed after the primary acquisition through the neck. The supplemental images covered a limited area (usually the larynx or supraglottis) and, therefore, could be obtained while patients phonated. Imaging of the neck has now shifted to multidetector CT (MDCT). With a 64-detector MDCT, the entire neck can be imaged in 8 seconds. We evaluated whether "eee" phonation could be used during the entire acquisition through the neck without degrading image quality.

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“…10,11 CT may be helpful in diagnosis of vocal fold paralysis also, although a CT suggestive of vocal fold paralysis is not definitively diagnostic. 12,13 All of our patients undergo objective voice analysis and are advised to undergo pre-and postoperative voice therapy to eliminate compensatory hyperfunction and optimize safe phonation.…”

Section: Discussionmentioning

confidence: 99%