Keywords: Low-Field MRI, Low-Field MRI, RF coil
A widened-bandwidth RF volume coil using crossed elliptical winding pattern (symmetric in azimuthal direction) is proposed for Halbach-array-based portable MRI knee scanner. The fractional bandwidth (FBW) is 0.51% centered at 2.84 MHz (B0 = 67mT) with a high B1 field strength (57µT) and a high homogeneity (94%) within a cylindrical volume of diameter and length of both 95mm. Compared to solenoid coils of comparable dimensions, it is an increase of 18% in FBW, an improvement in homogeneity by 6.1%, and only a compromise of 1.9% in the field strength, which is the best combination.
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