Ying-Hua Chu1, Yi-Cheng Hsu2, Wen-Jui Kuo3, Fa-Hsuan Lin1
1Institute of Biomedical Engineering, National Taiwan University, Taipei, Taiwan; 2Department of Mathematics, Nnational Taiwan University, Taipei, Taiwan; 3Institute of Neuroscience, National Yang-Ming University, Taipei, Taiwan
We develop a 20-channel field probe system integrated with a 12-channel head coil array to dynamically detect the frequency fluctuations caused by the subject, eddy current, or other systemic changes during the 3T MRI scan. The frequency shift was continuously estimated by the phase difference monitored by the field probes. This information was found useful in dynamic tracking of the magnetic field distribution and the k-space trajectory. Our results suggest that, under the limit of a fixed number of RF channels, an integrated RF field probe and coil array system holds promise of high quality parallel MRI.