Detection of central fixation using short-time autoregressive spectral estimation during retinal birefringence scanning.
Med Eng Phys
; 37(9): 905-10, 2015 Sep.
Article
en En
| MEDLINE
| ID: mdl-26213271
The manuscript reports on the implementation of autoregressive spectral estimation aimed at improving the accuracy of detecting short-lasting events in signals acquired by a retinal birefringence scanning device that was reported earlier. A signal consisting of two frequency components is generated, where each frequency is a multiple of the scanning frequency. One frequency is produced during central fixation, while another one prevails during off-central fixation. These components may be of a very short duration, presenting a challenge for the FFT to identify them with sufficient time- and frequency resolution. Autoregressive spectral estimation using the Burg algorithm provided a satisfactory solution, capable of reliably differentiating between the two frequency components (96 and 192 Hz) on signal segments of duration as short as 5 ms. The device and the signal analysis methods were developed originally with the purpose of checking for eye alignment and strabismus - a major risk factor for amblyopia. The method enables the technology to work with less-cooperative patients, such as young children. Other medical and non-medical applications are possible.
Palabras clave
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Retina
/
Medidas del Movimiento Ocular
/
Fijación Ocular
Tipo de estudio:
Diagnostic_studies
/
Prognostic_studies
/
Risk_factors_studies
Límite:
Child
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Humans
/
Male
Idioma:
En
Revista:
Med Eng Phys
Asunto de la revista:
BIOFISICA
/
ENGENHARIA BIOMEDICA
Año:
2015
Tipo del documento:
Article
Pais de publicación:
Reino Unido