Efficient Optimal-Numerical-Analytical Computation: Segmented Spiral Coil at High Field

Introduction: RF field non-uniformities caused by shortened RF wavelengths in human tissue significantly affect the image quality, especially for high-field MRI [1]. Spiral coils [2, 3] have been put forth to improve field homogeneity. In addition, RF shimming based on a TEM coil [4] or an RF transmit array [5] is an efficient method to address such non-uniformities. In this work, we combine these approaches and present a modeling of a spiral coil utilizing an efficient computational numerical-analytical optimization to achieve RF shimming. The results are encouraging even at the rather high RF frequency of 400MHz, which corresponds to 9.4T Hydrogen imaging.