Omnidirectional Monolithic Marker for Intraoperative MR-based Positional Sensing in Closed MRI

We present a design of an inductively coupled radio frequency (ICRF) marker for magnetic resonance (MR)-based positional tracking, enabling the robust increase of tracking signal at all scanning orientations in quadrature-excited closed MR imaging (MRI). The marker employs three curved resonant circ...

Full description

Saved in:
Bibliographic Details
Published in:IEEE transactions on medical imaging 2023-08, p.1-1
Main Authors: Cheung, Chim-Lee, Wu, Mengjie, Fang, Ge, Ho, Justin D.L., Liang, Liyuan, Tan, Kel Vin, Lin, Fa-Hsuan, Chang, Hing-Chiu, Kwok, Ka-Wai
Format: Article
Language:English
Subjects:
Fabrication
inductively coupled radiofrequency (ICRF) coil
Inductors
interventional MRI
Magnetic resonance imaging
Magnetic resonance imaging (MRI)
position measurement
positional tracking
Radio frequency
RLC circuits
Target tracking
Wireless communication
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:We present a design of an inductively coupled radio frequency (ICRF) marker for magnetic resonance (MR)-based positional tracking, enabling the robust increase of tracking signal at all scanning orientations in quadrature-excited closed MR imaging (MRI). The marker employs three curved resonant circuits fully covering a cylindrical surface that encloses the signal source. Each resonant circuit is a planar spiral inductor with parallel plate capacitors fabricated monolithically on flexible printed circuit board (FPC) and bent to achieve the curved structure. Size of the constructed marker is Ø3 mm × 5 mm with quality factor > 22, and its tracking performance was validated with 1.5 T MRI scanner. As result, the marker remains as a high positive contrast spot under 360° rotations in 3 axes. The marker can be accurately localized with a maximum error of 0.56 mm under a displacement of 56 mm from the isocenter, along with an inherent standard deviation of 0.1 mm. Accrediting to the high image contrast, the presented marker enables automatic and real-time tracking in 3D without dependency on its orientation with respect to the MRI scanner receive coil. In combination with its small form-factor, the presented marker would facilitate robust and wireless MR-based tracking for intervention and clinical diagnosis. This method targets applications that can involve rotational changes in all axes (X-Y-Z).
ISSN:0278-0062
1558-254X
DOI:10.1109/TMI.2023.3309967