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A Catheter Tracking Method Using Reverse Polarization for MR-Guided Interventions

Summary: A Catheter Tracking Method Using Reverse Polarization
for MR-Guided Interventions
Haydar Celik,1 Asli Ulutu¨rk,2 Turgut Tali,2 and Ergin Atalar1,3,4,5*
To conduct interventional procedures in MRI, reliable visualiza-
tion of interventional devices such as catheters is necessary.
For this purpose, the use of inductively-coupled radio fre-
quency (ICRF) coils has been proposed. Without a wired con-
nection, the signal around the ICRF coil is amplified, enabling
catheters to be visualized. The wireless connection allows easy
handling of catheters, in some pulse sequences, however, it
might be difficult to differentiate the catheters from anatomical
background information. In this work, a novel ICRF coil visual-
ization method, which allows separation of the catheter and the
anatomical information by using the reverse and forward polar-
ization modes of a coil, is proposed. This method allows images
of the anatomy and the catheter to be combined into a color-
coded image. First, an ICRF coil with decoupling diodes was
constructed; we call this a receive-coupled RF (RCRF) coil. The
RF safety profile of the RCRF coil is shown to be better than the
ICRF coil. Second, to demonstrate the feasibility of this method,


Source: Atalar, Ergin - Department of Electrical and Electronics Engineering, Bilkent University


Collections: Engineering; Biology and Medicine