Custom, spray coated receive coils for magnetic resonance imaging

Zamarayeva, Alla M.; Gopalan, Karthik; Corea, Joseph; Liu, M. Z.; Pang, Kaixuan; Lustig, Michael; Arias, Ana Claudia

doi:10.1038/s41598-021-81833-0

Cited by 11 publications

(14 citation statements)

References 33 publications

(20 reference statements)

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“…For example, a flexible form-fitting phased-array coil designed for being conformed to the anatomy of different sizes or shapes can significantly reduce the spatial distance between the coil and the human body portion, thus maximizing the image SNR [ 39 ]. Zamarayeva et al [ 40 ] proposed a method employing spray deposition of silver nanoparticle inks and dielectric materials on 3D printed substrates for additive and rapid manufacturing of 3D patient-specific coils which ensure the perfect fit to the body parts with complex geometries such as the neck.…”

Section: Biomedical Applications Exploiting Magnetic Fieldmentioning

confidence: 99%

Shaping and Focusing Magnetic Field in the Human Body: State-of-the Art and Promising Technologies

Rotundo

Brizi

Flori

et al. 2022

Sensors

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In recent years, the usage of radio frequency magnetic fields for biomedical applications has increased exponentially. Several diagnostic and therapeutic methodologies exploit this physical entity such as, for instance, magnetic resonance imaging, hyperthermia with magnetic nanoparticles and transcranial magnetic stimulation. Within this framework, the magnetic field focusing and shaping, at different depths inside the tissue, emerges as one of the most important challenges from a technological point of view, since it is highly desirable for improving the effectiveness of clinical methodologies. In this review paper, we will first report some of the biomedical practices employing radio frequency magnetic fields, that appear most promising in clinical settings, explaining the underneath physical principles and operative procedures. Specifically, we direct the interest toward hyperthermia with magnetic nanoparticles and transcranial magnetic stimulation, together with a brief mention of magnetic resonance imaging. Additionally, we deeply review the technological solutions that have appeared so far in the literature to shape and control the radio frequency magnetic field distribution within biological tissues, highlighting human applications. In particular, volume and surface coils, together with the recent raise of metamaterials and metasurfaces will be reported. The present review manuscript can be useful to fill the actual gap in the literature and to serve as a guide for the physicians and engineers working in these fields.

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Section: Biomedical Applications Exploiting Magnetic Fieldmentioning

confidence: 99%

Shaping and Focusing Magnetic Field in the Human Body: State-of-the Art and Promising Technologies

Rotundo

Brizi

Flori

et al. 2022

Sensors

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show abstract

“…Moreover, conventional coils are not designed for reproducible patient positioning and do not limit the patient's movement, leading to motion artifacts. Very recent literature [84] described a method for additive and rapid manufacturing of 3D patient-specific coils, with the characteristic of ensuring a perfect fit to the body parts with complex geometries like a neck. The developed method employed spray deposition of silver nanoparticle inks and dielectric materials on 3D printed substrates for constituting high-quality coil components, with the result that the prototype patient-specific coil array exhibits up to five times higher SNR than a commercial coil array, with a potential application in cases when patient reproducible placement is important, as for MRI guided surgeries.…”

Section: Patient-specific Coilsmentioning

confidence: 99%

The Core of Medical Imaging: State of the Art and Perspectives on the Detectors

et al. 2021

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In this review, the roles of detectors in various medical imaging techniques were described. Ultrasound, optical (near-infrared spectroscopy and optical coherence tomography) and thermal imaging, magnetic resonance imaging, computed tomography, single-photon emission tomography, positron emission tomography were the imaging modalities considered. For each methodology, the state of the art of detectors mainly used in the systems was described, emphasizing new technologies applied.

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“…[13,30] Alternatively, rigid conformal surface coils have been reported for the imaging of macaque monkeys and humans. [3,31,32] However, these fabrication methods either require the extensive manual manipulation of copper wire or the step-wise spray deposition of conductive traces on a 3D-printed mold substrate using a masked patterning approach.…”

Section: Introductionmentioning

confidence: 99%

Additive Manufacturing of Subject‐Conformal Receive Coils for Magnetic Resonance Imaging

Vanduffel

Parra‐Cabrera

Gsell

et al. 2022

Adv Materials Technologies

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information without the use of ionizing radiation, rendering itself an advanced diagnostic, research tool. When a subject is placed within a strong magnetic field (B 0 ), the spins of MRI-active nuclei (e.g., 1 H) have the tendency to align with B 0 and precess at a frequency that scales with the field strength. [2] MRI is based on the observation of the relaxation of these nuclei after their excitation by a radiofrequency (RF) pulse using a transmit (T x ) coil. The excitation results in the deviation of these spins from their original orientation with respect to B 0 . Upon relaxation, the spins will return to their original orientation, inducing a voltage in a receive (R x ) coil (Figure 1A,B). An R x coil circuit consists of the principal metal inductor in which the signal is induced; two capacitors, one for impedance matching (C M ) and the other for tuning the resonance frequency (C T ), and an additional inductor in series with a diode making up the active detuning circuit to decouple between the transmit and receive phases of the RF coil (Figure 1C). [3] MR image quality is determined by its resolution, the contrast, the absence of artifacts, and the signal-to-noise ratio High signal-to-noise ratio (SNR) is crucial to obtaining high-quality magnetic resonance (MR) images. However, a poor fit of fixed-size radiofrequency (RF) coils to the subject often limits the SNR both in research and clinical magnetic resonance imaging (MRI) practice. Therefore, there is an urgent need to fabricate RF coils that exhibit a close geometrical fit (or are subject conformal) to the to-be-imaged region. A range of 3D printing methods are proposed for producing such conformal coils and overcoming constraints in geometrical complexity, production time, and cost. Laser powder bed fusion and stereolithography-based methods are explored. The fully digital workflow allows for the seamless integration of electromagnetic simulations of geometrically complex coils, resulting in rapid design iterations. SNR gains up to 68% are observed for single 3D-printed subject-conformal coils compared to a state-of-the-art commercially available (nonconformal) coil array. In addition to tests on phantoms, a conformal 3D-printed coil is used to image the metacarpophalangeal joint of the thumb from a volunteer on an MRI scanner to demonstrate the improved image quality.

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Custom, spray coated receive coils for magnetic resonance imaging

Cited by 11 publications

References 33 publications

Shaping and Focusing Magnetic Field in the Human Body: State-of-the Art and Promising Technologies

Shaping and Focusing Magnetic Field in the Human Body: State-of-the Art and Promising Technologies

The Core of Medical Imaging: State of the Art and Perspectives on the Detectors

Additive Manufacturing of Subject‐Conformal Receive Coils for Magnetic Resonance Imaging

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