For gradient-free RF spatial encoding, MR image based B1 mapping methods cannot be used due to the absence of gradient coils. However, it is important to get a B1 map particularly if Bloch-Siegert shift encoding is used. In this work, a method to automatically measure the amplitude of B1 field is introduced. Three perpendicular pickup loops were used to measure the B1 field in three orthogonal axes simultaneously. The position of the pickup loops was controlled by 3D printer, and the peak-to-peak voltage of the coupled signal was automatically saved using PC oscilloscope.
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