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Analysis of high-pitched phonation using three-dimensional computed tomography.

Hiroyuki Hiramatsu¹, Ryoji Tokashiki, Hirokazu Nakamura

¹Department of Otolaryngology, Tokyo Medical University Hospital, Tokyo, Japan. hiro441741@aa.cyberhome.ne.jp

Journal of Voice : Official Journal of the Voice Foundation

|January 3, 2012

Summary

During high-pitched phonation, arytenoid cartilages move anteriorly and caudally, not posteriorly. This study used 3D CT scans to analyze vocal fold dynamics in transgender patients, revealing pitch-related cartilage displacement.

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Area of Science:

Laryngology
Vocal Fold Physiology
Medical Imaging

Background:

Understanding vocal fold dynamics is crucial for voice production.
High-pitched phonation involves complex laryngeal adjustments.
Previous research on arytenoid cartilage movement during pitch changes is limited.

Purpose of the Study:

To investigate arytenoid cartilage movement during high-pitched phonation using three-dimensional computed tomography (3DCT).
To analyze the role of arytenoid cartilage displacement in vocal fold elongation for pitch control.

Main Methods:

Prospective study involving 14 patients with male-to-female gender identity disorder.
3DCT imaging was performed for surgical simulation.
Arytenoid cartilage positions were compared between comfortable and high-pitched phonations, measuring movement direction and distance.

Main Results:

High-pitched phonation caused cricothyroid space narrowing (rotation) and anterior gliding of the inferior horn.
Vocal fold elongation was confirmed during high-pitched tasks.
Arytenoid cartilages displaced anteriorly and caudally during high-pitched phonation.

Conclusions:

Arytenoid cartilages do not move posteriorly to elongate vocal folds for high-pitched sounds.
Anterior and caudal displacement of arytenoid cartilages is due to tension from vocal fold elongation.
The cricoarytenoid joint may not directly control vocal fold length for pitch modulation.