Sejung Yang1, Hahnsung Kim2, Sang-Young Zho2, Byung-Uk Lee1, Dong-Hyun Kim2,3
1Electronics Engineering, Ewha W. University, Seoul, Korea; 2School of Electrical & Electronic Engineering, Yonsei University, Seoul, Korea; 3Radiology, Yonsei University, Seoul, Korea
Shimming using passive shims can enhance the homogeneity. The position of the passive shims have been typically placed at fixed regions or manually adjusted. Further improvements are possible if the positions can be optimized for individual subjects. We present a sample-specific passive shimming method. A shim structure capable of adjusting the position of the passive shims is built and optimal shim positions are computed using an optimization algorithm. Compared to previous in-vivo passive shim approaches, the proposed method avoids trial and error when finding the best shim position and can be a robust method for improving B0 homogeneity in vivo.