Abstract:

Here we propose a second decimation algorithm for widening the range of sweep width in the AD9874 based digital receiver to meet the sweep width requirement set by the clinic imaging pulse sequences. The algorithm is implemented using a two-step approach. First, the best over-sampling number is found adaptively and adjusted automatically to the sweep width of the digital receiver. Secondly, digital filtering and decimation processing are employed. The performance of the proposed second decimation algorithm was tested on a 0.3 T imaging system using a single pulse experiment and an imaging experiment.

Key words: magnetic resonance imaging, digital receiver, digital filter, second decimation