Patients with deep brain stimulation (DBS) implants have limited access to MRI due safety concerns associated RF-induced heating. Currently, in these patients is allowed 1.5T horizontal bore scanners utilizing pulse sequences reduced power. However, the use of 3T such increasingly reported based on assessments. Here we present results comprehensive RF heating measurements for two commercially available DBS systems during at and 3T.To assess effect imaging landmark, lead configuration,...

Patients with active implants such as deep brain stimulation (DBS) devices are often denied access to MRI due safety concerns associated the radiofrequency (RF) heating of their electrodes. The majority studies on RF conductive have been performed in horizontal close-bore scanners. Vertical scanners which a 90° rotated transmit coil generate fundamentally different electric and magnetic field distributions, yet very little is known about this class We numerical simulations well phantom...

Interaction of an active electronic implant such as a deep brain stimulation (DBS) system and MRI RF fields can induce excessive tissue heating, limiting accessibility. Efforts to quantify heating mostly rely on electromagnetic (EM) simulations assess individualized specific absorption rate (SAR), but require extensive computational resources. Here, we investigate if predictive model using machine learning (ML) predict the local SAR in around tips implanted leads from distribution tangential...

The majority of studies that assess magnetic resonance imaging (MRI) induced radiofrequency (RF) heating the tissue when active electronic implants are present have been performed in horizontal, closed-bore MRI systems. Vertical, open-bore systems a 90° rotated magnet and fundamentally different RF coil geometry, thus generating substantially field distribution inside body. Little is known about elongated such as deep brain stimulation (DBS) devices this class scanners. Here, we conducted...

Radiofrequency (RF) tissue heating around deep brain stimulation (DBS) leads is a well-known safety risk during MRI, resulting in strict imaging guidelines and limited allowable protocols. The implanted lead's trajectory orientation with respect to the MRI electric fields contribute variations magnitude of RF across patients. Currently, there are no surgical requirements for implanting extracranial portion DBS lead, substantial clinical lead trajectories consequently heating. Recent studies...

Radiofrequency (RF) heating of tissue during magnetic resonance imaging (MRI) is a known safety risk in the presence active implantable medical devices (AIMDs). As result, access to MRI limited for patients with these implants including those deep brain stimulation (DBS) systems. Numerous factors contribute excessive RF at DBS lead-tip, most notable being trajectory lead. Phantom studies have demonstrated that looping extracranial portion lead surgical burr hole reduces lead-tip; however,...

Magnetic Resonance Imaging (MRI) access remains conditional to patients with conductive medical implants, as RF heating generated around the implant during scanning may cause tissue burns. Experiments have been traditionally used assess this heating, but they are time-consuming and expensive, in many cases cannot faithfully replicate in-vivo scenario. Alternatively, ISO TS 10974 outlines a four-tier assessment approach based on combination of experiments full-wave electromagnetic (EM)...

Patients with deep brain stimulation (DBS) implants are often denied access to magnetic resonance imaging (MRI) due safety concerns associated RF heating of implants. Although MR-conditional DBS devices available, complying manufacturer guidelines has proved be difficult as pulse sequences that optimally visualize target structures tend have much higher specific absorption rate (SAR) radiofrequency energy than current allow. The MR-labeling devices, well the majority studies on conductive...

Abstract Purpose To develop and test an MRI coil assembly for imaging deep brain stimulation (DBS) at 3 T with a reduced level of local specific absorption rate RF fields near the implant. Methods A mechanical rotatable linearly polarized birdcage transmitter outfitted 32‐channel receive array was constructed. The performance image quality were systematically evaluated using bench‐level measurements tests, including SNR maps, element noise correlation, acceleration capabilities....

Deep brain stimulation (DBS) is a common treatment for variety of neurological and psychiatric disorders. Recent studies have highlighted the role neuroimaging in localizing position electrode contacts relative to target areas order optimize DBS programming. Among different imaging methods, postoperative magnetic resonance (MRI) has been widely used localization; however, geometrical distortion induced by lead limits its accuracy. In this work, we investigated what degree difference between...

Patients with deep brain stimulation (DBS) devices have limited access to magnetic resonance imaging (MRI) due safety concerns associated RF heating generated around the implant. The problem of predicting conductive leads is complex a large parameter space and several interplaying factors. Recently however, off-label use MRI in patients DBS has been reported based on assessments, raising concern that potentially dangerous scenarios may overlooked. In this work, we present results systematic...

Patients with long conductive implants such as deep brain stimulation (DBS) leads are often denied access to magnetic resonance imaging (MRI) exams due safety concerns associated radiofrequency (RF) heating of implants. Experimental temperature measurements in tissue-mimicking gel phantoms under MRI RF exposure conditions common practices predict in-vivo the tissue surrounding wire Such experiments both expensive-as they require units-and time-consuming complex implant setups. Recently,...

Radiofrequency (RF) induced tissue heating around deep brain stimulation (DBS) leads is a well-known safety risk during magnetic resonance imaging (MRI), hindering routine protocols for patients. Known factors that contribute to variations in the magnitude of RF across patients include implanted lead's trajectory and its orientation with respect MRI electric fields. Currently, there are no consistent requirements surgically implanting extracranial portion DBS lead. Recent studies have shown...

A prototype of an adjustable DBS-friendly Tx/Rx 3T coil system was built and evaluated with measurements numerical simulations characterizing its image quality SAR profile. The work envisions the use novel MRI hardware that will make fully accessible to patients DBS implants.

Low-field MRI systems have been advertised as “safe” for patients with implants – but is this true? In a series of systematic simulations, we looked at varied length, amount coiling, and insulation during RF exposure in both 0.55 T 1.5 environments. We found that the actual apparent length implant can significantly impact heating. There are several cases where heating substantially higher than T, suggesting no broad claims should be made, these factors need to carefully considered before...

MRI at 3 T is restricted for patients with deep brain stimulation (DBS) systems due to potential radiofrequency (RF) heating. Here, we present the first large-scale, systematic study determine how trajectory-related parameters affect RF heating and quantify extent of reduction. Introducing concentric loops close surgical burr hole substantially reduced Increasing number correlated well decreased Recommendations based on results from phantom experiments were easily adopted during procedure...

MRI is restricted for patients with cardiac implantable electronic devices (CIEDs)—especially children epicardial systems—due to potential radiofrequency (RF) heating of the tissue around lead. Here, we present first assessment RF and endocardial CIEDs varying lead lengths in a vertical system, where found up 78-fold reduction simulated maximum specific absorption rate (SAR) compared horizontal coil. Reduction 0.1g-averaged SAR coil was consistent leads various internal wire geometries...

Purpose: Low-field MRI has been assumed to be implant-friendly based on limited studies. However, RF-induced heating due an implant is a complex resonance phenomenon, highly dependent the implant's configurations and applied RF frequencies. This study aims evaluate of DBS implants during at low-field strengths compared higher field 1.5 T MRI. Methods: A commercial deep brain stimulation (DBS) was used in full system as well lead only compare MR imaging 0.55 T. The transfer function device...

Motivation: Use of commercial tools to reposition/pose numerical body models match subject posture in MRI can result significant non-anatomical distortions the model. Goal(s): Introduce approach avoid for a model seated position. Approach: “Seated” versions were produced by: 1) using software alone, and 2) strategically combining portions original offline followed by post-processing. SAR was calculated both an open-bore double-donut system. Results: The Combined avoided...

Motivation: Radiofrequency (RF) tissue heating is a known safety risk for patients with cardiac implantable electronic devices (CIEDs), especially children epicardial systems. Goal(s): We present the first cumulative transfer function based on guidelines in ISO/TS 10974 to evaluate RF of CIED bipolar lead. Approach: measured, calibrated, and validated functions predicting through vitro experiments electromagnetic simulations. Results: Our accurately predicted around electrode ends 48 unique...

Motivation: Radiofrequency-induced heating of elongated medical implants during MR imaging on newly introduced commercial 0.55T systems has not been thoroughly investigated. Goal(s): We aim to evaluate and compare the RF MRI at 1.5T scanners. Approach: Neurological cardiac implant leads were routed along different trajectories inside a tissue mimicking gel phantom, temperature increase was measured lead tip. Results: For certain configurations, can be an order magnitude higher than that...

The prevailing view suggests low-field MRI is safer for patients with medical implants, but evidence insufficient. Radiofrequency (RF) heating in elongated implants complex, many interacting factors influencing the outcome. Thus, deeming universally safe on scant data could endanger patient safety. This study evaluates RF of a commercial deep brain stimulation (DBS) implant during at 0.55 T and 1.5 through phantom measurements transfer function prediction. Results demonstrate that can induce...

Radiofrequency (RF) induced tissue heating during magnetic resonance imaging (MRI) is the predominant safety risk for patients with active electronic implants such as cardiac implantable devices (CIEDs) which typically have elongated conductive leads. Currently, abandoned CIED leads, well CIEDs epicardial are contraindicated MRI exams. Recent studies demonstrated superior of vertical, open-bore systems regarding RF compared to conventional closed-bore scanners. However, these only...

A substantial and growing population of individuals with conductive implants face persistent challenges in accessing magnetic resonance imaging (MRI) due to risks associated radiofrequency (RF) heating implants. Recently, a novel approach based on altering MRI electric fields at the location individual's has shown promise substantially reducing RF adult patients deep brain stimulation devices. In this study, we present results electromagnetic thermal simulation studies demonstrating...