Algorithm of digital demodulation and filtering in MRI spectrometers.
- Author:
Wen-Yu PAN
1
;
Zheng-Min LIU
;
He-Qin ZHOU
Author Information
1. Department of Automation, University of Science and Technology of China, Hefei, 230027. panly@mail.ustc.edu.cn
- Publication Type:Journal Article
- MeSH:
Algorithms;
Magnetic Resonance Imaging;
instrumentation;
methods;
Radio Waves;
Signal Processing, Computer-Assisted;
instrumentation;
Software
- From:
Chinese Journal of Medical Instrumentation
2008;32(4):271-274
- CountryChina
- Language:Chinese
-
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.
