[Algorithm of digital demodulation and filtering in MRI spectrometers].
Zhongguo Yi Liao Qi Xie Za Zhi
; 32(4): 271-4, 2008 Jul.
Article
en Zh
| MEDLINE
| ID: mdl-18973037
ABSTRACT
In the design of RF receiver of the digital MRI spectrometer console, a digital demodulation and filtering algorithm is presented in this thesis. The MR signals are firstly converted to digital signals by the A/D converter, and then quadrature-demodulated from high frequency carrier wave. The CIC filter, half-band filter and linear phase FIR filter are designed to process the cascaded filtering and decimation of the demodulated signals. This method achieves a satisfying processing speed and filtering effect, and also reduces the data size obviously. The experiment based on the permanent magnetism resonance imaging system proves its effectiveness and practicability.
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Banco de datos:
MEDLINE
Asunto principal:
Imagen por Resonancia Magnética
Tipo de estudio:
Prognostic_studies
Idioma:
Zh
Año:
2008
Tipo del documento:
Article