Stretchable receive coil for 7T small animal MRI

Ramesh, Thejas Vishnu; Narongrit, Folk W; Susnjar, Antonia; Rispoli, Joseph V.

doi:10.1016/j.jmr.2023.107510

Cited by 3 publications

(2 citation statements)

References 25 publications

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“…Although these designs offer high flexibility, truly stretchable coil designs require the use of unconventional conductive materials such as copper braids [ 52 ], conductive thread [ 30 , 53 , 54 , 55 ], liquid metal [ 8 , 18 , 21 , 56 , 57 , 58 ], and conductive elastomer [ 31 ]. Even though such materials are lossier than traditionally used copper wires, it was shown that they can offer similar SNR and provide additional advantages such as light weight and radiological transparency [ 59 ].…”

Section: Recent Development In Flexible Mri Rf Coil Technologymentioning

confidence: 99%

Stretchable Sensor Materials Applicable to Radiofrequency Coil Design in Magnetic Resonance Imaging: A Review

Vazquez,

Motovilova,

Winkler

2024

Sensors

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Wearable sensors are rapidly gaining influence in the diagnostics, monitoring, and treatment of disease, thereby improving patient outcomes. In this review, we aim to explore how these advances can be applied to magnetic resonance imaging (MRI). We begin by (i) introducing limitations in current flexible/stretchable RF coils and then move to the broader field of flexible sensor technology to identify translatable technologies. To this goal, we discuss (ii) emerging materials currently used for sensor substrates, (iii) stretchable conductive materials, (iv) pairing and matching of conductors with substrates, and (v) implementation of lumped elements such as capacitors. Applicable (vi) fabrication methods are presented, and the review concludes with a brief commentary on (vii) the implementation of the discussed sensor technologies in MRI coil applications. The main takeaway of our research is that a large body of work has led to exciting new sensor innovations allowing for stretchable wearables, but further exploration of materials and manufacturing techniques remains necessary, especially when applied to MRI diagnostics.

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Section: Recent Development In Flexible Mri Rf Coil Technologymentioning

confidence: 99%

Stretchable Sensor Materials Applicable to Radiofrequency Coil Design in Magnetic Resonance Imaging: A Review

Vazquez,

Motovilova,

Winkler

2024

Sensors

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“…However, none of these methods represent a truly stretchable coil design. research has shown early stretchable coil conductor prototypes using unconventional materials such as copper braids [26], conductive thread [27][28][29][30], liquid metal [31][32][33][34][35][36], and conductive elastomer [37]. Even though such alternative materials are lossier than traditionally used copper conductors, it was shown that they can offer similar SNR and provide additional advantages such as light weight and radiological transparency [38].…”

Section: Introductionmentioning

confidence: 99%

Dual-Channel Stretchable, Self-Tuning, Liquid Metal Coils and Their Fabrication Techniques

Motovilova,

Ching,

Vincent

et al. 2023

Sensors

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Flexible and stretchable radiofrequency coils for magnetic resonance imaging represent an emerging and rapidly growing field. The main advantage of such coil designs is their conformal nature, enabling a closer anatomical fit, patient comfort, and freedom of movement. Previously, we demonstrated a proof-of-concept single element stretchable coil design with a self-tuning smart geometry. In this work, we evaluate the feasibility of scaling this coil concept to a multi-element coil array and the associated engineering and manufacturing challenges. To this goal, we study a dual-channel coil array using full-wave simulations, bench testing, in vitro, and in vivo imaging in a 3 T scanner. We use three fabrication techniques to manufacture dual-channel receive coil arrays: (1) single-layer casting, (2) double-layer casting, and (3) direct-ink-writing. All fabricated arrays perform equally well on the bench and produce similar sensitivity maps. The direct-ink-writing method is found to be the most advantageous fabrication technique for fabrication speed, accuracy, repeatability, and total coil array thickness (0.6 mm). Bench tests show excellent frequency stability of 128 ± 0.6 MHz (0% to 30% stretch). Compared to a commercial knee coil array, the stretchable coil array is more conformal to anatomy and provides 50% improved signal-to-noise ratio in the region of interest.

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Stretching the Limits of MRI—Stretchable and Modular Coil Array Using Conductive Thread Technology

Narongrit,

Vishnu Ramesh,

Rispoli

2024

IEEE Access

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Objective: We propose a modular stretchable coil design using conductive threads and commercially available embroidery machines. The coil design increases customizability of coil arrays for individual patients and each body part. Methods: Eight rectangular coils were constructed with custom-fabricated stretchable tinsel copper threads incorporated onto textile. Tune, match, and detune circuits were incorporated on the coil. A hook-and-loop mechanism was used to attach and decouple the modular coils. Phantom and in vivo scans at various anatomical flexion angles were acquired to highlight performance, and a temperature test was performed to verify safety. Results: In vivo MRI experiments demonstrate high sensitivity and coverage of each anatomy. As the coils are stretched, the sensitive volume increases at a rate of 10.93 mL/cm 2 . The SNR reduction of a single coil was greater during compression than when stretched, but this did not affect image quality for the array. The modularity of the array allows for adaptability for any anatomy with simple on-demand adjustment to the number and position of coil elements. Conclusion: The images demonstrated high sensitivity and coverage of the stretchable array for various anatomies and flexion angles. Stretching the coils increases the sensitive volume, allowing for a larger region to be effectively imaged. The resonance shift and SNR decrease during stretch and compression support further investigation of methods to reduce frequency shift in stretchable coils. Significance: The proposed array design allows for highly stretchable, flexible, modular, and conformal patient-centered coils that allow for increased imaging quality, greater comfort, and rapid production.

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Stretchable receive coil for 7T small animal MRI

Cited by 3 publications

References 25 publications

Stretchable Sensor Materials Applicable to Radiofrequency Coil Design in Magnetic Resonance Imaging: A Review

Stretchable Sensor Materials Applicable to Radiofrequency Coil Design in Magnetic Resonance Imaging: A Review

Dual-Channel Stretchable, Self-Tuning, Liquid Metal Coils and Their Fabrication Techniques

Stretching the Limits of MRI—Stretchable and Modular Coil Array Using Conductive Thread Technology

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