Active MR tracking on a 0.2 Tesla MR imager.
An active MR tracking system was implemented on a 0.2 Tesla open MRI system. Interventional devices with receive-only microcoils at their tips were developed and investigated on the scanner. Microcoils having a diameter of about 1 mm and 20 turns were found to provide sufficient signal-to-noise ratios for stable tracking. Positional accuracy and precision were found to be acceptable under practical conditions. Simulation of MR-guided biopsy using biplane images with tracking was performed in a gelatin phantom and dog livers. Successful tracking of catheters with integrated microcoils was also demonstrated in the aorta and IVC of live dogs.
Aoki
S
S
Department of Radiology, Yamanashi Medical University, Nakakoma-gun, Japan.
Nanbu
A
A
Araki
T
T
Ma
X
X
Araki
T
T
Kumagai
H
H
Dumoulin
C L
CL
Darrow
R D
RD
Shimazu
N
N
Tsukamoto
T
T
Moriya
H
H
Nakajima
H
H
D000818:Animals; D001707:Biopsy, Needle / Q000295:instrumentation; D002404:Catheterization; D004285:Dogs; D004867:Equipment Design; D005240:Feasibility Studies; D006801:Humans; D008099:Liver / Q000033:anatomy & histology; D008279:Magnetic Resonance Imaging / Q000295:instrumentation*; D019047:Phantoms, Imaging