DocumentCode :
3069472
Title :
Transmission line effects on the coil noise correlation matrix in MRI
Author :
Brown, Ryan ; Wang, Yi
Author_Institution :
department Radiology, Weill Medical College of Cornell University, New York, 10022, USA
fYear :
2008
fDate :
20-25 Aug. 2008
Firstpage :
2032
Lastpage :
2035
Abstract :
Noise correlation is an important topic in radiofrequency (RF) coil design for magnetic resonance imaging (MRI). The original noise correlation formula derived by Redpath showed correlation depends on the real part of the inverse impedance matrix. In this work, we introduce a more generalized formula to include effects from transmission lines and preamplifier input impedance mismatch. This formula is used to calculate correlation between two-channel circuits connected to preamplifiers using transmission lines of variable electrical length. The calculated correlation matches well with that measured on the MR scanner and suggests transmission line length can be utilized as an additional degree of freedom for coil decoupling, and can be adjusted to achieve zero noise correlation.
Keywords :
Circuit noise; Coils; Distributed parameter circuits; Impedance; Magnetic noise; Magnetic resonance imaging; Preamplifiers; Radio frequency; Transmission line matrix methods; Transmission line measurements; Computer Simulation; Electric Impedance; Equipment Design; Magnetic Resonance Imaging; Models, Theoretical;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Engineering in Medicine and Biology Society, 2008. EMBS 2008. 30th Annual International Conference of the IEEE
Conference_Location :
Vancouver, BC
ISSN :
1557-170X
Print_ISBN :
978-1-4244-1814-5
Electronic_ISBN :
1557-170X
Type :
conf
DOI :
10.1109/IEMBS.2008.4649590
Filename :
4649590
Link To Document :
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