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SSFP-Based MR Thermometry Vaishali Paliwal,1

Summary: SSFP-Based MR Thermometry
Vaishali Paliwal,1
AbdEl-Monem El-Sharkawy,2
Xiangying Du,3
Xiaoming Yang,3
Ergin Atalar14*
Of the various techniques employed to quantify temperature
changes by MR, proton resonance frequency (PRF) shift-based
phase-difference imaging (PDI) is the most accurate and widely
used. However, PDI is associated with various artifacts. Moti-
vated by these limitations, we developed a new method to
monitor temperature changes by MRI using the balanced
steady-state free precession (balanced-SSFP) pulse sequence.
Magnitude images obtained with the SSFP pulse sequence
were used to find the PRF shift, which is proportional to tem-
perature change. Spatiotemporal temperature maps were suc-
cessfully reconstructed with this technique in gel phantom ex-
periments and a rabbit model. The results show that the bal-
anced-SSFP-based method is a promising new technique for


Source: Atalar, Ergin - Department of Electrical and Electronics Engineering, Bilkent University


Collections: Engineering; Biology and Medicine