Istituto di Fisiologia Clinica     
Giovannetti G., Hartwig V., Viti V., Gaeta G., Francesconi R., Landini L., Benassi A. Application of undersampling technique for the design of an NMR signals digital receiver. In: Concepts in Magnetic Resonance Part B-Magnetic Resonance Engineering, vol. 29B pp. 107 - 114. Wiley Periodicals, Inc (eds.). Wiley, 2006.
In this article, undersampling technique theory and design, realization, and workbench test of a low-cost digital MRI (magnetic resonance imaging) receiver are reported. The authors first discuss classic analog receiver architecture, reporting its disadvantages, and then present a receiver with a complete description of the electronic circuit. The intended use of the subsystem should be as a radiofrequency (RF) receiver chain in a low-cost dedicated MRI scanner (e.g., suitable for musculoskeletal limbs studies). The digital receiver consists of a passband (antialiasing) lter, an ADC (analog to digital converter) to digitalize the signal with the undersampling technique, and a DDC (digital down converter) for the frequency translation and filtering to process the signal using a PC. The use of the DDC guarantees perfect signals quadrature and high-performance filtering; moreover, it is adaptable to each modification of the system because of its programmability. Detailed specifications and hardware design of the digital receiver that is designed to be used in a dedicated MR scanner is provided, guaranteeing top performance and low cost.
URL: http://www3.interscience.wiley.com/cgi-bin/jhome/102521729?CRETRY=1&SRETRY=0
Subject Undersampling technique
Magnetic Resonance
Digital receiver

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