A rapid 2D time-resolved variable-rate k-space sampling MR technique for passive catheter tracking during endovascular procedures.
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 T1-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.
Unal
O
O
Department of Medical Physics, University of Wisconsin, Madison 53792-3252, USA.
Korosec
F R
FR
Frayne
R
R
Strother
C M
CM
Mistretta
C A
CA
D000800:Angioplasty, Balloon / Q000295:instrumentation*; D000818:Animals; D001011:Aorta / Q000473:pathology; D002339:Carotid Arteries / Q000473:pathology; D002405:Catheterization, Central Venous / Q000295:instrumentation*; D002406:Catheterization, Peripheral / Q000295:instrumentation*; D003287:Contrast Media; D004285:Dogs; D019786:Gadolinium DTPA; D006801:Humans; D007089:Image Enhancement; D008279:Magnetic Resonance Imaging / Q000295:instrumentation*; D019047:Phantoms, Imaging
D003287:Contrast Media; D019786:Gadolinium DTPA