Human vocal fold vibration is a complex 3D movement, and its frequency varies from 85-150 Hz (typical males) to 165-250 Hz (typical females). The unusual 3D shape of vocal folds is a hallmark for a variety of vocal diseases, such as polyps, nodules, recurrent nerve paralysis, and cancer.
The standard in-office methods for diagnosing voice disorders encompass videostroboscopy and high-speed videoendoscopy. Both techniques image only the horizontal movement of vocal folds. They cannot measure the absolute vibrational movement of vocal folds along the air flow direction. Despite the vital importance, currently, very few methods are available for 3D laryngeal imaging.
To overcome above limitation, we introduce the paradigm of light field imaging into laryngoscopy. The resultant method, which we term light field laryngoscopy (LFL), will enable 3D imaging of vocal folds in a single camera exposure. Moreover, to alleviate the trade-off between the spatial- and depth-resolution in light field imaging, we developed a hybrid imaging scheme which comprises an additional camera to provide a high-resolution 2D reference. Herein we will present the optical design of LFL, and characterize the imaging performance of the prototype.
Shuaishuai Zhu and Liang Gao, "Light field laryngoscopy (Conference Presentation)," Proc. SPIE 10486, Design and Quality for Biomedical Technologies XI, 104860D (Presented at SPIE BiOS: January 27, 2018; Published: 14 March 2018); https://doi.org/10.1117/12.2287202.5751456450001.
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