Abstract
We present a process to manufacture solenoidal microcoils with external support structures, which leaves the space within the coil windings free. The manufacturing procedure is based on a two solvent approach (water and acetone), for selectively etching polyvinyl alcohol and polymethyl methacrylate. Two sets of microcoils were manufactured with an inner diameter of 1.5 mm, an interwinding pitch of 100 μm and five or eight coil windings respectively. The coils were designed for application in magnetic resonance imaging and spectroscopy, and characterised in a 9.4 T MR scanner. An NMR spectrum of water and MR images in receive only and transceive mode were acquired as proof of concept.
Highlights
With the introduction of microcoil detectors in magnetic resonance spectroscopy (MRS) and imaging (MRI), the sensitivity of detection was increased for mass and volume limited samples [1,2,3,4]
We present a process to manufacture solenoidal microcoils with external support structures, which leaves the space within the coil windings free
Two sets of hollow microcoils were manufactured with the described procedure
Summary
With the introduction of microcoil detectors in magnetic resonance spectroscopy (MRS) and imaging (MRI), the sensitivity of detection was increased for mass and volume limited samples [1,2,3,4]. Though Olson et al showed that the use of microcoils can increase the mass sensitivity of MRS measurements considerably [5], solenoidal microcoils have not yet made their way to commercial success. Wirebonders have exceptional precision and their speed provides high throughput and repeatability in microcoil manufacturing
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