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Tissue‐independent MR tracking of invasive devices with an internal signal source
Author(s) -
Erhart Peter,
Ladd Mark E.,
Steiner Paul,
Heske Norbert,
Dumoulin Charles L.,
Debatin Jöorg F.
Publication year - 1998
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/mrm.1910390215
Subject(s) - electromagnetic coil , tracking (education) , signal (programming language) , perpendicular , noise (video) , acoustics , physics , nuclear magnetic resonance , computer science , mathematics , artificial intelligence , geometry , psychology , pedagogy , quantum mechanics , image (mathematics) , programming language
An improved MR tracking coil design is described that provides more robust tracking performance. It is shown theoretically and experimentally that a coil equipped with an internal spin source increases the signal‐to‐noise ratio in comparison to a coil system without internal source. The tracking behavior is stable even in air, which is important for laparoscopic work, in which the device has to be placed inside the inflated abdomen. Two types of coil windings were tested: one with the windings perpendicular to the coil axis and the other one with the windings tilted relative to this axis. The experiments showed no significant effect on the signal‐to‐noise ratio between the two types. The improved MR‐tracking coil design with internal source was successfully used in cholecystosto‐mies and in laparoscopic interventions; both procedures were performed on swine.