Purpose: To describe a digital fabrication method used for custom MRI receive coils with vacuum forming and electroless copper plating.
Methods: Our process produces intricate copper traces on curved surfaces. A three-dimensional scan of a desired anatomy is obtained and used to design coil elements. The layout is predistorted with a self built simulation of the vacuum forming process and the geometric overlaps are tested with electromagnetic simulation software. The desired coil geometry is patterned onto a polycarbonate sheet by sandblasting through a tape mask. The sandblasted areas are then catalyzed with a palladium-tin solution and vacuum formed. The catalyzed, three-dimensional part is placed into a custom built plating tank and copper plated. Electronic components are attached to the copper traces to form resonant receive coils. The methods described here are demonstrated and tested with an 8 channel visual cortex coil array.
Results: The prototype coils exhibit quality factor ratios higher than three, indicating body noise dominance. The coil array shows high signal-to-noise ratio (SNR) near the periphery of a head shaped phantom. In vivo images with up to spatial resolution were acquired on a human volunteer.
Conclusion: This work presents the first example of vacuum formed coils with direct electroless copper plating. Our fabrication method results in coil arrays that are in close proximity to the body. This methods described here may enable the rapid development of a set of coils of different sizes for applications including longitudinal fMRI studies and MR-guided therapies.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1002/mrm.29546 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Influence of Substrate Bias Voltage on Structure and Properties of (AlCrMoNiTi)N Films.
Nanomaterials (Basel)
December 2024
School of Intelligent Manufacturing, Luoyang Institute of Science and Technology, Luoyang 471023, China.
(AlCrMoNiTi)N high-entropy alloy nitride (HEAN) films were synthesized at various bias voltages using the co-filter cathodic vacuum arc (co-FCVA) deposition technique. This study systematically investigates the effect of bias voltage on the microstructure and performance of HEAN films. The results indicate that an increase in bias voltage enhances the energy of ions while concomitantly reducing the deposition rate.
View Article and Find Full Text PDFPhotoelectric Feedback Mechanism for Acceleration of Runaway Electrons in Gas Discharges at High Overvoltages.
Phys Rev Lett
December 2024
Laboratory of Plasma Physics (LPP), CNRS, Sorbonne Université, École Polytechnique, Institut Polytechnique de Paris, Palaiseau, France.
Energy conservation dictates that an electron with elementary charge e traversing a vacuum gap formed by electrodes maintained at potential difference U volts acquires maximum energy of eU. In many experiments electrons with energies as high as 3eU have been observed. The experimental discovery of this effect was made over 50 years ago and is still a subject of significant controversy in applications related to x-ray generation from high voltage discharges.
View Article and Find Full Text PDFVUV photochemistry of cyclopropenone (c-CHO): formation rate and abundance ratios of propynal (HCCCHO) and propadienone (CHCCO).
Phys Chem Chem Phys
December 2024
Sorbonne Université, CNRS, De la Molécule aux Nano-Objets: Réactivité, Interactions, Spectroscopies, MONARIS, Paris, 75005, France.
The distribution of isomeric species in the interstellar medium cannot be directly related to their relative energetic stabilities but more to their mechanisms of formation and evolution. The abundances of the three isomers of CHO, cyclopropenone, propynal and propadienone, are an example among many other interstellar species wherein kinetic effects control their presence in astrophysical regions. To date, only propynal and cyclopropenone, the two less stable isomers of propadienone, have been detected in the interstellar medium.
View Article and Find Full Text PDFRational approach to fetal heart rate monitoring and management during the second stage of labor.
Eur J Obstet Gynecol Reprod Biol
December 2024
Direttore UOC Ostetricia e Ginecologia, Azienda Ospedaliera Universitaria di Parma, Professore Ordinario di Ginecologia e Ostetricia, Direttore della Scuola di Specializzazione in Ostetricia e Ginecologia, Presidente del CdS OstetriciaUniversità di Parma, Italy. Electronic address:
Second stage of labor is considered to be associated with an increased risk of intrapartum fetal hypoxic injury. This is due to a combination of several risk factors such as -the increased frequency, strength and duration of uterine contractions due to higher number and affinity of myometrial oxytocin receptors; -the Ferguson's reflex which leads to a reflex release of endogenous oxytocin in response of the distension of the cervix by descending fetal head in late stages of labor; maternal expulsive efforts with the Valsalva manoeuvre that may reduce maternal oxygenation, as well as reduce the venous return and maternal cardiac output due to increased intrathoracic pressure, winch may lead to reduced placental oxygenation; - and increased fetal intracranial pressure due to head compression leading to a potential decrease in fetal cerebral oxygenation. In addition, the umbilical cord often forms one or more loops around the fetal neck, which may get tightened as the head descends leading to an acute and intermittent cessation of fetal oxygenation.
View Article and Find Full Text PDFA bismuth oxide-modified copper host achieving bubble-free and stable potassium metal batteries.
Chem Sci
December 2024
Siyuan Laboratory, Guangdong Provincial Engineering Technology Research Center of Vacuum Coating Technologies and New Energy Materials, College of Physics & Optoelectronic Engineering, Department of Physics, Jinan University Guangzhou 510632 China
Due to the minimal electrochemical oxidation-reduction potential, the potassium (K) metal anode has emerged as a focal in K-ion batteries. However, the reactivity of the K metal anode leads to significant side reactions, particularly gas evolution. Mitigating gas generation from K metal anodes has been a persistent challenge in the field.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!