Optimizing accuracy and precision of micro-coil localization in active-MR tracking

Daniels, Barret R.; Pratt, Ronald G.; Giaquinto, Randy O.; Dumoulin, Charles L.

doi:10.1016/j.mri.2015.11.005

Cited by 8 publications

(10 citation statements)

References 23 publications

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“…The tracking coils of the MR‐guidable feeding tube provided a sufficiently high‐quality representation of feeding tube curvature to accurately assess the location of the tube within the rabbit. Prior studies in our laboratory with similar MR tracking coils have shown that tracking accuracy is better than 0.52 mm 8 . Also, MRI allowed the imaging slice to be acquired in any plane (axial, sagittal, coronal, or oblique) without physically moving the rabbit or any component of the MRI scanner.…”

Section: Discussionmentioning

confidence: 99%

“…Active device visualization employs integrated MR solenoid microcoils that act as point source detectors. In the presence of a magnetic field gradient, the frequency of the MR signal is proportional to the coil position, and the 3‐dimensional location of the center of the coil can be determined within 0.52 mm 8 . The position of the tracking coils is often then overlaid on previously acquired MR imaging (MRI) to indicate device position relative to the anatomy of interest 9 , 10 .…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Magnetic Resonance–Guided Nasogastric Feeding Tube Placement for Neonates: A Preclinical Study

Daniels

Ireland

Kraus

et al. 2016

J Parenter Enteral Nutr

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Magnetic Resonance–Guided Nasogastric Feeding Tube Placement for Neonates: A Preclinical Study

Daniels

Ireland

Kraus

et al. 2016

J Parenter Enteral Nutr

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“…More is also not necessary due to the fourfold symmetry of the shelf. Whereas Algorithm 1 works with both cost functions (18) holds for all s ∈ P which is a consequence of (14). The results are presented in Table III.…”

Section: Localization With Experimental Datamentioning

confidence: 99%

“…Regardless of their shape, the electric current is always required to generate a magnetic field. In [14], this is realized by connecting them to an active power source. The localization of a resonant magnetic marker is described in [15].…”

Section: Introductionmentioning

confidence: 99%

Localization of Passive 3-D Coils as an Inverse Problem: Theoretical Analysis and a Numerical Method

et al. 2020

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This article provides both a theoretical analysis and a numerical method for the inverse source problem of locating multiple passive 3-D coils based on measurements of their superposed magnetic fields. In our context, a 3-D coil consists of three concentric circular coils being mutually perpendicular, and the term "passive" means that these coils are not connected to an active power source. Instead, their current is induced externally by a low-frequency alternating magnetic field which is generated by a closed exciter wire. The underlying inductively coupled system is modeled with regard to the 3-D coils as magnetic dipoles and their localization is formulated as an inverse problem. Since its ill posedness mainly arises from strong sensitivity to observational noise, an approximate upper bound for the localization error is derived mathematically by linearization. The Levenberg-Marquardt algorithm is applied as a method for localization and modified for better performance as well as the ability to estimate the number of 3-D coils in the localization area. Our method is tested with simulated and real data in order to confirm its capability of locating up to three passive 3-D coils within the front of a wooden shelf surrounded by the exciter wire and eight rectangular loop antennas.

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“…4). An active tracking sequence consisting of intermittent non-selective excitations combined with spatially encoding gradients enables measurement of 1D projections in each space dimension and estimation of the 3D coordinates of the position of the micro-coils [20••, 30]. Real-time estimates of the position of micro-coils can be used to estimate catheter tip orientation.…”

Section: Passive and Active Catheter Trackingmentioning

confidence: 99%

Advances in Real-Time MRI–Guided Electrophysiology

Mukherjee

Chubb

Roujol

et al. 2019

Curr Cardiovasc Imaging Rep

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Purpose of ReviewTheoretical benefits of real-time MRI guidance over conventional electrophysiology include contemporaneous 3D substrate assessment and accurate intra-procedural guidance and evaluation of ablation lesions. We review the unique challenges inherent to MRI-guided electrophysiology and how to translate the potential benefits in the treatment of cardiac arrhythmias.Recent FindingsOver the last 5 years, there has been substantial progress, initially in animal models and more recently in clinical studies, to establish methods and develop workflows within the MR environment that resemble those of conventional electrophysiology laboratories. Real-time MRI-guided systems have been used to perform electroanatomic mapping and ablation in patients with atrial flutter, and there is interest in developing the technology to tackle more complex arrhythmias including atrial fibrillation and ventricular tachycardia.SummaryMainstream adoption of real-time MRI-guided electrophysiology will require demonstration of clinical benefit and will be aided by increased availability of devices suitable for use in the MRI environment.

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Optimizing accuracy and precision of micro-coil localization in active-MR tracking

Cited by 8 publications

References 23 publications

Magnetic Resonance–Guided Nasogastric Feeding Tube Placement for Neonates: A Preclinical Study

Magnetic Resonance–Guided Nasogastric Feeding Tube Placement for Neonates: A Preclinical Study

Localization of Passive 3-D Coils as an Inverse Problem: Theoretical Analysis and a Numerical Method

Advances in Real-Time MRI–Guided Electrophysiology

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