The Catheter-Driven MRI Scanner: A New Approach to Intravascular Catheter Tracking and Imaging-Parameter Adjustment for Interventional MRI
Frank K. Wacker1,2,
Daniel Elgort1,
Claudia M. Hillenbrand1,
Jeffrey L. Duerk1 and
Jonathan S. Lewin3
1 Department of Radiology, Case Western Reserve University, 11100 Euclid Ave.,
MRI Bolwel B124, Cleveland, OH 44106.
2 Department of Radiology, Charité–Universitätsmedizin Berlin,
Campus Benjamin Franklin, Berlin 12200, Germany.
3 Present address: Department of Radiology, Johns Hopkins Hospital, 601 N
Caroline St., Rm. 4210, Baltimore, MD 21287-0842.
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Fig. 1. —Schematic diagram of two-element capacitively coupled
tracking coil. Circuit is tuned to Larmor frequency of system and matched to
50  at tip of catheter using capacitors CT and
CM. Active detuning via positive-intrinsic-negative (PIN) diode and
choke is accomplished remotely. Fifty-ohm microcoaxial cable is used to
connect tracking coil to MRI receiver.
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Fig. 2. —Screenshot from MRI monitor showing customized part of user
interface on which tracking parameter setting can be adjusted before starting
interventional MRI-guided procedure. This customized part is integrated in
standard graphic user interface of MRI scanner software.
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Fig. 3A. —Selected images from continuously acquired coronal oblique 2D
true fast imaging with steady-state free precession series (TR/TE, 4.5/3; flip
angle, 70°; matrix, 128 x 128; field of view, 150–300 mm;
slice thickness, 8 mm) during catheter manipulations in abdominal aorta in
pigs. Catheter is equipped with two microcoils (arrows) for
localization.
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Fig. 3B. —Selected images from continuously acquired coronal oblique 2D
true fast imaging with steady-state free precession series (TR/TE, 4.5/3; flip
angle, 70°; matrix, 128 x 128; field of view, 150–300 mm;
slice thickness, 8 mm) during catheter manipulations in abdominal aorta in
pigs. Catheter is equipped with two microcoils (arrows) for
localization.
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Fig. 3C. —Selected images from continuously acquired coronal oblique 2D
true fast imaging with steady-state free precession series (TR/TE, 4.5/3; flip
angle, 70°; matrix, 128 x 128; field of view, 150–300 mm;
slice thickness, 8 mm) during catheter manipulations in abdominal aorta in
pigs. Catheter is equipped with two microcoils (arrows) for
localization.
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Fig. 3D. —Selected images from continuously acquired coronal oblique 2D
true fast imaging with steady-state free precession series (TR/TE, 4.5/3; flip
angle, 70°; matrix, 128 x 128; field of view, 150–300 mm;
slice thickness, 8 mm) during catheter manipulations in abdominal aorta in
pigs. Catheter is equipped with two microcoils (arrows) for
localization.
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View larger version (96K):
[in a new window]
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Fig. 3E. —Selected images from continuously acquired coronal oblique 2D
true fast imaging with steady-state free precession series (TR/TE, 4.5/3; flip
angle, 70°; matrix, 128 x 128; field of view, 150–300 mm;
slice thickness, 8 mm) during catheter manipulations in abdominal aorta in
pigs. Catheter in stable position leads to automatic stepwise zoom in.
Catheter retraction in aorta leads to zoom out and to automatic scanning plane
adjustment. Arrows indicate microcoils.
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Copyright © 2004 by the American Roentgen Ray Society.
