Mechanical and electrical properties of electroplated copper for MR-imaging coils

Uelzen, Th.; Fandrey, S.; Müller, Jörg

doi:10.1007/s00542-005-0069-8

Cited by 15 publications

(10 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The coil structures were etched into the copper layer. Subsequently, the coil structures were thickened to 50 μm by electroplating using an advanced thick resist lithography process (24). The electroplating increases the Q ‐factor of the coils that is essential for a high SNR as given in Eq.…”

Section: Methodsmentioning

confidence: 99%

A novel active MR probe using a miniaturized optical link for a 1.5‐T MRI scanner

Fandrey

Weiß

Müller

2011

Magnetic Resonance in Med

View full text Add to dashboard Cite

Applying an active intravascular MR catheter device that allows signal transmission from the catheter tip requires special means to avoid radiofrequency-induced heating. This article presents a novel, miniaturized all-optical active MR probe to use with real-time MRI in minimally invasive interventions for catheter guidance and intravascular imaging. An optical link transmits the received MR signals from the catheter tip to the MR receiver with inherently radiofrequency-safe optical fibers. Furthermore, power is supplied optically to the transmitter as well. The complete integration into a small tube of 6-Fr (2-mm diameter) size with a 7-Fr (2.33-mm diameter) rigid tubing was realized using chip components for the optical modulator and a novel miniaturized optical bench fabricated from silicon substrates with 3D self-aligning structures for fiber integration. In MRI phantom measurements, projection-based tip tracking and high-resolution imaging were successfully performed with the optical link inside a 1.5-T MRI scanner. Images were obtained in a homogeneous phantom liquid, and first pictures were acquired from inside a kiwi that demonstrates the potential of the MR-safe optical link. The signal-to-noise ratio has significantly improved compared with former systems, and it is demonstrated that the novel optical link exhibits a signal-to-noise ratio comparable to a direct electrical link.

show abstract

Section: Methodsmentioning

confidence: 99%

A novel active MR probe using a miniaturized optical link for a 1.5‐T MRI scanner

Fandrey

Weiß

Müller

2011

Magnetic Resonance in Med

View full text Add to dashboard Cite

show abstract

“…The electrochemical impedance, charge delivery capacity and stability of the flexible electrodes have been investigated [33], [34]. Also, we have recently developed a low-loss and fine-pitch Copper/liquid crystal polymer (LCP) laminate using the nanobonding technology in low vacuum are suitable for flexible microelectronic and biomedical systems [36], [37]. Also, Cu lines with 7 m width separated by spaces of 50 m on LCP were demonstrated [36] (see Fig 9).…”

Section: Implantable Systems Integration -Metal-polymer Bondingmentioning

confidence: 99%

“…Also, Cu lines with 7 m width separated by spaces of 50 m on LCP were demonstrated [36] (see Fig 9). Polymer based implantable systems have been demonstrated through the integration of electronic components with power source and data analysis circuitry for intravascular blood pressure measurements and drug delivery [37], [38]. The accumulated knowledge can be used to develop nanobonding based implantable flexible electrodes for electrical stimulation and blood pressure sensing systems.…”

Section: Implantable Systems Integration -Metal-polymer Bondingmentioning

confidence: 99%

Future nano- and micro-systems using nanobonding technologies

Howlader

Deen

2014

AIP Conference Proceedings

View full text Add to dashboard Cite

In this paper, some of the recent achievements in surface-activation-based nanobonding technology are described. This bonding technology allows for the combination of electronic, photonic, fluidic and mechanical functionalities into small form-factor systems for emerging applications in health diagnostics and screening, for example. These nanobonding technologies provide void-free, strong, and nanoscale bonding at room temperature or at low temperatures (<200 °C), and they do not require chemicals, adhesives, or high external pressure. The interfaces of the nanobonded materials in ultra-high vacuum and in air correspond to the covalent bonds, and hydrogen and hydroxyl bonds, respectively, which gives rise to excellent bonding properties. Further, these nanobonding technologies are well-suited for the development of low-cost, high-performance miniaturized systems such as biophotonic imaging systems.Keywords: Surface activated nanobonding, surface, interface, metal interconnects, semiconductor fabrication, bonding in ultra-high vacuum and in air, biophotonic imaging systems.

show abstract

“…The developed process is compatible with flexible substrates such as polymer thin films. To our knowledge, only few teams have worked on the realization of miniature flexible coils (Uelzen et al 2005;Ellersiek et al 2005;Dohi et al 2005) and no imaging using such devices was reported so far.…”

Section: Introductionmentioning

confidence: 97%

Characterization of flexible RF microcoils dedicated to local MRI

et al. 2006

View full text Add to dashboard Cite

In magnetic resonance imaging (MRI), the electrical performance of the RF coil is critical to achieve sufficient signal to noise ratio (SNR), especially when microscopic structures [about (100 lm) 3 ] have to be observed. In this field of application, we have developed a device (microcoil) based on the original concept of monolithic resonator, dedicated to superficial region imaging (human skin) or small animal imaging. This paper presents the developed process based on micromoulding. Flexible thin films of polymer have been used as dielectric substrate so that the microcoil could be form-fitted to non-plane surfaces. First, electrical characterizations of the RF coils have been performed. The results were compared to the expected values. A flexible RF coil of 15 mm diameter was then used to perform proton MRI of a saline phantom. When the coil was form-fitted to the phantom surface, a maximum SNR gain of 2 was achieved with respect to identical but plane RF coil. Finally, the flexible coil was used to perform MRI in vivo with high spatial resolution on a mouse using a small animal dedicated scanner operating at 2.35 T.

show abstract

Mechanical and electrical properties of electroplated copper for MR-imaging coils

Cited by 15 publications

References 10 publications

A novel active MR probe using a miniaturized optical link for a 1.5‐T MRI scanner

A novel active MR probe using a miniaturized optical link for a 1.5‐T MRI scanner

Future nano- and micro-systems using nanobonding technologies

Characterization of flexible RF microcoils dedicated to local MRI

Contact Info

Product

Resources

About