The need of low-field MRI systems is mainly for biomedical applications and also for food quality measurements. For example, it is used to measure the quantity of fat and moisture in samples of minced beef and meat. Benefits of using low field MRI system are higher accuracy in detection, reduced system cost, size and its complexity. The key element of MRI system is the digital receiver. The architecture of receiver is inspired from advance digital signal processing techniques that are exponentially applied in the mobile radio and cellular based systems. In the area of Telecommunications the set of these techniques is commonly called “Software Defined Radio” (SDR) or “Digital Receiving”. Its basic idea is to perform digital to analog conversion as close to the receiving coil as possible. All the signal processing can be then realized in the digital domain. This has the advantage of noise and distortion reduction associated with analog mixing stage and better out-of-band noise rejection by the decimation and the digital filters. Moreover, the parameters of the system are fully programmable. They could be modified by the software and without changing the hardware architecture.
SDR, MRI, low-field
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