Abstract
This paper reports on a spring-shaped micro coil with low resistance for MRI. The micro coil was fabricated by vacuum evaporation and electroplating of Cu onto the spring-shaped structure made by 3D printer. Since the spring-shaped structure is flexible, we could keep spring-shaped structure of wide pitch to complete large area of Cu wires by vacuum evaporation, that has a low resistance. Furthermore, the micro coil could be compressed with a jig to increase the number of turns per unit length. The resistance of the fabricated spring-shaped micro coil at the frequency of 85.8 MHz was measured at 2.30 Ω. Compared to the resistance of hand-winding coil, the resistance of spring-shaped micro coil decreased by 17 %. The MRI image of the cooking oil was taken by using spring-shaped micro coil at the pixel size of 100×100 μm2 , the SNR was 40.
