Clinical feasibility of the new technique of functional 3D laryngeal CT

Jun, Beom Cho; Kim, Hyung-Tae; Kim, Hyunsoo; Cho, Seung-Ho

doi:10.1080/00016480510028546

Cited by 13 publications

(7 citation statements)

References 9 publications

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“…and ). To prevent forming only an anterior glottic web, the first suture was placed on the lateral thyroarytenoid muscle, including the low subglottic portion, and the second suture was placed on the vocalis muscle, not including the subglottic portion in one‐third of the membranous vocal folds, which contribute mainly to high‐pitched sound . Two different levels of sutures formed a funnel shape that shortened the anterior one‐third of the membranous vocal fold, and the anterior commissure was relocated to enhance continuous smooth glottic air flow, which is important for a clear voice (Fig.…”

Section: Methodsmentioning

confidence: 99%

A New Conceptual Approach for Voice Feminization: 12 Years of Experience

Kim¹

2016

The Laryngoscope

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Section: Methodsmentioning

confidence: 99%

A New Conceptual Approach for Voice Feminization: 12 Years of Experience

Kim¹

2016

The Laryngoscope

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“…[56] Studies have been conducted that have used sequential scans during different phonations. [7] Some of these studies have shown that coronal reconstruction of images acquired during ‘hee’ phonation could improve the detection rate of vocal cord palsy. [8]…”

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confidence: 99%

Dynamic MRI of the vocal cords using phased-array coils: A feasibility study

Schlamann

Lehnerdt

Maderwald

et al. 2009

Indian J Radiol Imaging

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Objective:Endoscopy for evaluation of hoarseness is an invasive procedure and the result depends, to a large extent, on the patient's cooperation. Successful laryngoscopy can also be hampered by unfavourable anatomic conditions, a severely impaired general condition, or severe coagulopathy. We evaluated the feasibility of doing ultra-fast magnetic resonance imaging (MRI), using a recent dedicated coil design and a sequence with inherently high signal-to-noise ratios (SNR), for the detection of motility disorders of the vocal cords.Materials and Methods:Twelve consecutive patients (eight males and four females) in the age range of 24–80 years (mean age 60 years) with persistent hoarseness and presumed vocal cord palsy were included in this blinded prospective study. Two two-element phased-array carotid coils were used for signal reception. The first coronal real-time steady-state free precession (SSFP) sequence was performed during silence (i.e., with no vocal cord motion) and the second while phonating ‘heee.’ Qualitative MRI findings were compared with the results of the endoscopic examination.Results:The examination time for setup, patient instruction and positioning, localization scans, and real-time SSFP scans was less than 10 min. Seven patients with laryngoscopically-confirmed unilateral palsy of the vocal cord were correctly identified with MRI. The five remaining patients had hoarseness due to causes other than vocal cord palsy; they showed normal motion of the vocal cords on MRI and endoscopy.Conclusion:Compared to preceding studies, the image quality in this study is supported by excellent SNR (carotid phased-array coils and SSFP sequence with higher SNR if compared to a spoiled gradient-echo sequence or an EPI sequence). Further studies, with larger groups of patients, are necessary to show if this protocol can serve as an alternative to endoscopy in selected cases.

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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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Clinical feasibility of the new technique of functional 3D laryngeal CT

Abstract: The dynamic vocal fold 3D image during phonation could visualize that the thickness and volume were decreased in relatively to the pitch increase. Typical subglottic shoulder-like image formation and ventricular widening were noted with the high-pitch tone.

Cited by 13 publications

References 9 publications

A New Conceptual Approach for Voice Feminization: 12 Years of Experience

A New Conceptual Approach for Voice Feminization: 12 Years of Experience

Dynamic MRI of the vocal cords using phased-array coils: A feasibility study

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

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