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Abstract #1478

Proton resonance frequency based MR thermometry using shifted-echo bSSFP

Seohee So1, Jaejin Cho1, Kinam Kwon1, Byungjai Kim1, Wonil Lee1, and Hyunwook Park1

1School of Electrical Engineering, Korea Advanced Institute of Science and Technology, Daejeon, Republic of Korea

Magnetic resonance thermometry provides noninvasive temperature measurements for thermal therapy. In this abstract, we exploit linear phase relation generated by echo shifting in the bSSFP acquisition to measure PRF change. Echo-shifting from TE=TR/2 in bSSFP provides a linear relation between phase of transverse magnetization and phase evolution in TR. This linearity enables frequency prediction from the phase information, which makes temperature measurement with PRF shift possible. The performed simulations show shifted-echo bSSFP of TE=TR/4 well estimates frequency change.

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