[Physical and technical elements of short-interval, color-filtered double strobe flash-stroboscopy].

Area of Science:

• Laryngology
• Biomedical Engineering
• Acoustic Analysis

Background:

• Quantitative measurement of vocal fold movements is crucial for understanding voice production.
• Existing methods like high-speed imaging have limitations.
• A novel technique, short-interval, color-filtered double-strobe flash stroboscopy, is presented.

Purpose of the Study:

• To describe the physical and technical aspects of the new stroboscopy technique.
• To demonstrate its capability for quantitative measurement of vocal fold movements.
• To highlight its potential clinical utility.

Main Methods:

• Utilized two KAY Elemetrics RLS 9100 strobe units in a master-slave configuration.
• Introduced an adjustable interval of 0.1-2.0 ms between color-filtered flashes.
• Achieved double exposure per video frame for real-time visualization and off-line quantification.

Main Results:

• Enabled real-time visualization of vocal fold opening and closing velocities.
• Allowed for quantitative measurement of vocal fold movement velocity across different pitches and sound pressure levels.
• Provided dynamic property information within a single image.

Conclusions:

• Short-interval, color-filtered double-strobe flash stroboscopy facilitates quantitative analysis of vocal fold vibration velocity.
• The technique offers valuable insights into vocal fold dynamics.
• Its application can enhance clinical documentation and patient assessment.