| Objective: To identify the sonographic normal values and influencing factor of human vocal cord and false vocal cord and to confirm the value of high-frequency ultrasound applying to the larynx.Methods: Totally 164 healthy volunteers were divided into eight groups according to their age and gender. The volunteers were placed in the supine position with the neck hyperextended. High-frequency ultrasound was used to measure the length, width and thickness of both vocal cord and false vocal cord. Images were obtained during the phase of quiet breathing and hold breathing respectively. The parameters criteria of both vocal cord and false vocal cord with different group were established. Data were statistically analyzed and the rate of clear visualization of male group was compared with that of female group.Results: (1)This work established the parameters criteria of both vocal cord and false vocal cord with ultrasound. (2)The length, width and thickness of vocal cord and false vocal cord in volunteers younger than 18 years were increased gradually along with age and obviously correlated with age,during quite breathing all r≥0.827, at the phase of the closure of the rima glottidis all r≥0.710,but no significant correlation was found in the adult groups whose values were relatively stable. (3)The measurements of the three parameters of both vocal cord and false vocal cord in male adults were greater than those in female adults (both P<0.001).(4)100% of female group got clear images of their vocal cords and false vocal cords, but in male group, only 78.2% and 83.9% respectively. The rate of clear visualization in male group was significantly lower than that in female group (P<0.001) and gradually decreased along with age.Conclusions: Both of vocal cord and false vocal cord could be clearly demonstrated by high-frequency ultrasound. The establishment of the ranges of normal values of both vocal cord and false vocal cord would provide a new valuable choice for the clinical practice.
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