Development of a multi-turn double helix dipole coil for magnetic resonance microimaging of chemically-fixed human embryos at 7T.

A double helix dipole (DHD) coil, consisting of two tilted solenoid coils, exhibits the high signal-to-noise ratio (SNR) close to that of an equivalent solenoid whose SNR is almost three times larger than a saddle coil. However, its application to high-field MRI is challenging because of the high inductance. Here, we proposed a new DHD coil design with division capacitors that enables high-field MRI application. As proof-of-concept, we designed a 6-turn DHD coil for MR microimaging of a chemically-fixed human embryo specimen at 7T, and showed that the proposed DHD has nearly twice the SNR of an equivalent saddle coil.