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A rapid 2D time‐resolved variable‐rate k ‐space sampling MR technique for passive catheter tracking during endovascular procedures
Author(s) -
Unal Orhan,
Korosec Frank R.,
Frayne Richard,
Strother Charles M.,
Mistretta Charles A.
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.1910400304
Subject(s) - k space , tracking (education) , sampling (signal processing) , catheter , radiology , variable (mathematics) , computer science , materials science , biomedical engineering , physics , medicine , nuclear medicine , nuclear magnetic resonance , magnetic resonance imaging , computer vision , mathematics , mathematical analysis , filter (signal processing) , psychology , pedagogy
A new, fast, 2D MR imaging technique allowing passive catheter visualization adequate for use as a tool for guiding the movement of a catheter during endovascular procedures is described. This imaging technique samples low spatial frequencies more often than high spatial frequencies; it also uses both k ‐space view sharing and temporal interpolation. Unlike other techniques for passive visualization that exploit magnetic‐susceptibility–induced artifacts, we have adopted a strategy that takes advantage of the T 1 ‐shortening effect of paramagnetic contrast agents, such as Gd‐DTPA and a projection dephaser. This not only permits visualization of the entire catheter length but also minimizes the risk of intravascular heating. Using this method, a temporal frame rate of up to eight images per second and a tip localization accuracy of ± 1mm (root mean square difference) can be achieved.