The research of decoded compression arithmetic for medical high-frequency ultrasound coded excitation imaging / 中国医疗器械杂志
Chinese Journal of Medical Instrumentation
;
(6): 409-413, 2011.
Artigo
em Chinês
| WPRIM
| ID: wpr-325967
ABSTRACT
This paper combined the coded excitation with the technique of ophthalmic high-frequency ultrasonic imaging, and raised a new high-velocity data detection and signal processing method. 16 bit Golay complementarity sequences were produced by FPGA, which excited the probe to produce ultrasonic waves. Data detection circuit achieved the digitalized of the 15 MHz high-frequency ultrasonic echo signals in real time. Sampling rate was 120MHz, and sampling bit was 14 bit. Decoded compression arithmetic was realized by FPGA in real time, in which A code compression was alternated with B code compression. The return echo was correlated with the corresponding decode filter A and filter B respectively, and then the echo was delayed and summed to complete the decoding process. The experiment indicated that coded excitation can effectively increase the range of mainlobe and decrease the range of sidelobe. This technique can effectively raise the signal-to-noise ratio, and has significant research value in advancing the ophthalmic ultrasonic image quality and raising the safety of the equipment.
Texto completo:
DisponíveL
Índice:
WPRIM (Pacífico Ocidental)
Assunto principal:
Processamento de Sinais Assistido por Computador
/
Ultrassonografia
/
Compressão de Dados
/
Técnicas de Diagnóstico Oftalmológico
/
Métodos
Tipo de estudo:
Estudo diagnóstico
Idioma:
Chinês
Revista:
Chinese Journal of Medical Instrumentation
Ano de publicação:
2011
Tipo de documento:
Artigo
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