Phase symmetry

• The degree that TVFs match in movement during closure.

• The alignment of vocal cords during phonation.

• The timing of breath support during speech.

• The pitch variation in vocal fold vibration.

SAPMuC

• Symmetry

• Amplitude

• Closure

• Frequency

Periodicity

• Regularity of vibratory cycles

• Irregularity of vibratory cycles

• Frequency of sound waves

• Amplitude of sound waves

Endoscope

• Instrument used to visualize the vocal folds. Can be rigid or flexible.

• A tool for measuring blood pressure.

• A device for monitoring heart rate.

• An instrument for examining the ear.

Closure

• Closure pattern of the glottis at maximum adduction

• Closure pattern of the glottis at minimum adduction

• Closure pattern of the vocal cords during inhalation

• Closure pattern of the glottis during speech production

Low-tech measurements where expensive equipment is not needed

• S/Z ratio, Mean phonation time (aka Maximum Phonation Time)

• Voice quality assessment

• Acoustic analysis using spectrograms

• Lung capacity measurement

Benefits of flexible stroboscopy

• Less likely to make a patient gag

• Can evaluate velopharyngeal insufficiency

• Patient can speak normally (not limited to only the /i/ vowel)

• Increases the risk of gag reflex

Cranial nerve assessment

• Can be done during a voice evaluation

• Is only necessary for patients with neurological disorders

• Is not relevant to speech therapy

• Only assesses CN 1 and 2

Benefits of rigid stroboscopy

• High quality image (larger and better resolution)

• Increased risk of infection

• Requires general anesthesia

• Longer recovery time

Videostroboscopy or Laryngostroboscopy

• Uses a strobe light to show the full phase of TVF vibration from one cycle to the next

• Is a method for measuring lung capacity

• Involves the use of a camera to record vocal cord movement

• Is primarily used for diagnosing hearing loss