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Omnidirectional Monolithic Marker for Intra-Operative MR-Based Positional Sensing in Closed MRI | IEEE Journals & Magazine | IEEE Xplore

Omnidirectional Monolithic Marker for Intra-Operative MR-Based Positional Sensing in Closed MRI


Abstract:

We present a design of an inductively coupled radio frequency (ICRF) marker for magnetic resonance (MR)-based positional tracking, enabling the robust increase of trackin...Show More

Abstract:

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 \times5 -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).
Published in: IEEE Transactions on Medical Imaging ( Volume: 43, Issue: 1, January 2024)
Page(s): 439 - 448
Date of Publication: 30 August 2023

ISSN Information:

PubMed ID: 37647176

Funding Agency:


References

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