[Algorithm of digital demodulation and filtering in MRI spectrometers].
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.
Pan
Wen-Yu
WY
Department of Automation, University of Science and Technology of China, Hefei, 230027. panly@mail.ustc.edu.cn
Liu
Zheng-Min
ZM
Zhou
He-Qin
HQ
D000465:Algorithms; D008279:Magnetic Resonance Imaging / Q000295:instrumentation / Q000379:methods*; D011846:Radio Waves; D012815:Signal Processing, Computer-Assisted / Q000295:instrumentation; D012984:Software