For parallel transmit coils, maximum field-intensity is seen for the ROI close to each coil and, peripheral imaging region in between the coils usually show minimum field-intensity. For this reason, a compact orientation of multiple coils is usually used to surround the ROI. An approach of field extension to the regions in between coils is presented here for a 4-channel microstrip coil. Multiple narrow floating copper strips (width 4 mm) were used in between coils. For three such strips, image signal intensity between the coils almost doubled, that resulted in 20% increase in image homogeneity and 25% increase in SNR.
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