Introduction For successful RF coil development and improvement, coil characterization plays an essential role. A quantitative map of the magnetic field produced per unit current (B1unit+) provides information about the coil efficiency as well as its sensitivity distribution [1]. This allows one to predict SNR, homogeneity and sensitive volume. A mapping method with high accuracy over a large d...

A small pancake coil was wound using 1.2m long, 10 mm wide YBCO coated superconductor tape with impregnation by epoxy resin. The coil was immersed in liquid nitrogen and tested in several regimes. In the DC regime, we measured the I-V curve, the hysteresis of the magnetic field-current curve at liquid nitrogen temperature and the radial component of the coil field at the coil edges. The critica...

Purpose: Parallel transmit technology for MRI at 7 tesla will significantly benefit from high performance arrays that offer efficiency and low mutual coupling between the individual array elements. A novel dual-mode with nested elements has been developed to support imaging human brain in both single-channel (sTx) parallel-transmit (pTx) excitation modes of a scanner. In this work, design, impl...

This research proposed a new design of helmet-shaped array transcranial magnetic stimulation coil system. It was constructed using several sagittal directional wires and several coronal directional wires. By varying the current direction and strength on each wire, this array coil system could be constructed into the circular coil and figure-eight coil of different size. Also, this proposed coil...

A small pancake coil was wound using 1.2m long, 10 mm wide YBCO coated superconductor tape with impregnation by epoxy resin. The coil was immersed in liquid nitrogen and tested in several regimes. In the DC regime, we measured the I-V curve, the hysteresis of the magnetic field-current curve at liquid nitrogen temperature and the radial component of the coil field at the coil edges. The critica...

OBJECTIVE Accurate and reproducible coil positioning is important for headache research using transcranial magnetic stimulation protocols. We aimed to design a transcranial magnetic stimulation coil holder and demonstrate reliability of test-retest coil positioning. METHODS A coil holder was developed and manufactured according to three principles of stability, durability, and three-dimension...