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Single‐loop coil concepts for intravascular magnetic resonance imaging
Author(s) -
Quick Harald H.,
Ladd Mark E.,
ZimmermannPaul Gesine G.,
Erhart Peter,
Hofmann Eugen,
von Schulthess Gustav K.,
Debatin Jörg F.
Publication year - 1999
Publication title -
magnetic resonance in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.696
H-Index - 225
eISSN - 1522-2594
pISSN - 0740-3194
DOI - 10.1002/(sici)1522-2594(199904)41:4<751::aid-mrm14>3.0.co;2-v
Subject(s) - electromagnetic coil , materials science , signal (programming language) , biomedical engineering , radiofrequency coil , nuclear magnetic resonance , magnetic resonance imaging , acoustics , computer science , physics , radiology , medicine , quantum mechanics , programming language
Compared with other coil designs that have been investigated for intravascular use, the single‐loop coil can be designed with a very small diameter for insertion into small vessels and with a longitudinal extent over several centimeters for multislice imaging. If it designed to be expandable inside the target vessel, then it combines these features with increased signal‐to‐noise ratio (SNR) and penetration depth. Expandable single‐loop coils that are capable of meeting these requirements were developed and integrated into two different commercial catheter‐based delivery systems: a self‐expandable, single‐loop made from NiTinol and a single‐loop coil mounted on an inflatable balloon. The influence of a small‐diameter coaxial cable for remote tuning and matching on the coil performance was investigated. Calculations showed the dependence of the signal on the separation between the conductors. The comparison of both catheter approaches in in vitro flow experiments and in an in vivo pig experiment revealed the influence of pulsatile flow on image quality during intravascular imaging with these designs. Magn Reson Med 41:751–758, 1999. © 1999 Wiley‐Liss, Inc.