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1.
Fa Yi Xue Za Zhi ; 36(3): 305-310, 2020 Jun.
Artigo em Inglês, Chinês | MEDLINE | ID: mdl-32705841

RESUMO

ABSTRACT: Objective The tests of three types of auditory evoked potentials (AEPs) were performed on normal young adults, to understand the frequency characteristics of different testing methods and the relationship between response threshold and pure tone audiometry threshold of different methods, and to discuss the forensic value of 3 types of AEPs to evaluate hearing function. Methods Twenty normal young adults were selected, their standard pure tone audiometry threshold, short-term pure tone audiometry threshold and the response threshold of 3 types of AEPs (tone burst-auditory brainstem response, 40 Hz auditory event-related potential and slow vertex response) at 0.5 kHz, 1.0 kHz, 2.0 kHz and 4.0 kHz were recorded. The relationship between the response threshold and standard pure tone audiometry threshold, short-term pure tone audiometry threshold of 3 types of AEPs at different frequencies as well as the differences between different types of AEPs were analyzed. Results The short-term pure tone audiometry threshold was higher than the standard pure tone audiometry threshold at each frequency. The response threshold and standard pure tone audiometry threshold of the 3 types of AEPs all had a certain correlation, and the response threshold of the 3 types of AEPs was higher than short-term pure tone audiometry threshold and standard pure tone audiometry threshold at each frequency. The differences in the differences between the response threshold and standard pure tone audiometry threshold of the 3 types of AEPs at different frequencies had statistical significance. Linear regression mathematical models were established to infer the standard pure tone audiometry threshold (hearing level) from response threshold (sound pressure level) of 3 types of AEPs of normal young adults. Conclusion When using response threshold of different types of AEPs to estimate pure tone audiometry threshold, conversion and correction are needed. Combined use of different types of AEPs could improve the accuracy of hearing function evaluation.


Assuntos
Audiometria de Tons Puros , Potenciais Evocados Auditivos do Tronco Encefálico , Potenciais Evocados Auditivos , Audiometria de Resposta Evocada , Limiar Auditivo , Audição , Humanos , Adulto Jovem
2.
Opt Lett ; 31(8): 1070-2, 2006 Apr 15.
Artigo em Inglês | MEDLINE | ID: mdl-16625906

RESUMO

Continuous-wave 457 blue laser emission at powers as high as 4.6 W is achieved by using a fiber-coupled laser diode array with a power of 30 W to pump 0.1 at. % low-doped bulk Nd:YVO4 crystal, with intracavity frequency doubling in a 15 mm long type I critical phase-matched LiB3O5 (LBO) crystal in a compact three-fold cavity with a length of less than 100 mm. The optical-optical conversion efficiency is greater than 15.3%, and the stability of the output power is better than 3% for an hour.

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