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The noise factor of receiver coil matching networks in MRI

Cao, Xueming; Fischer, Elmar; Gruschke, Oliver; Korvink, Jan G.; Hennig, Jürgen; Maunder, Adam M.; De Zanche, Nicola; Zaitsev, Maxim



Abstract (englisch): In typical MRI applications the dominant noise sources in the received signal are the sample, the coil loop and the preamplifier. We hypothesize that in some cases (e.g. for very small receiver coils) the matching network noise has to be considered explicitly. Considering the difficulties of direct experimental determinations of the noise factor of matching networks with sufficient accuracy, it is helpful to estimate the noise factor by calculation. A useful formula of the coil matching network is obtained by separating commonly used coil matching network into different stages and calculating their noise factor analytically by a combination of the noise from these stages. A useful formula of the coil matching network is obtained. ADS simulations are performed to verify the theoretical predictions. Thereafter carefully-designed proof-of-concept phantom experiments are carried out to qualitatively confirm the predicted SNR behavior. The matching network noise behavior is further theoretically investigated for a variety of scenarios. It is found that in practice the coil matching network noise can be improved by adjusting the coil open port resonant frequency.


Zugehörige Institution(en) am KIT Institut für Mikrostrukturtechnik (IMT)
Publikationstyp Zeitschriftenaufsatz
Jahr 2017
Sprache Englisch
Identifikator DOI: 10.1016/j.mri.2016.10.032
ISSN: 0730-725X, 1873-5894
KITopen ID: 1000063509
HGF-Programm 47.02.07; LK 01
Erschienen in Magnetic resonance imaging
Band 37
Seiten 252–259
Bemerkung zur Veröffentlichung http://www.sciencedirect.com/science/article/pii/S0730725X16302028
Schlagworte Receiver coil; Matching network; Noise factor; Small loop; SNR
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