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Abstract #1652

Using a Double Echo Steady State (DESS) Sequence to Monitor Thermal Treatments

Juan Plata 1,2 , Kristin Granlund 2 , Brian Hargreaves 2 , and Kim Butts Pauly 2

1 Bioengineering, Stanford University, Stanford, CA, United States, 2 Radiology, Stanford University, Stanford, CA, United States

Monitoring thermal treatments using a double echo steady state (DESS) sequence can allow for real-time lesion visualization. Proton resonant frequency changes from the first echo can be used to compute changes in temperature, while associated changes in signal intensity of the second echo are related to changes in T1, T2, and ADC. All these parameters have been previously associated with irreversible changes in tissue viability. Our work focused on empirically determining how these parameters changed in an egg-white phantom, and then using this information to simulate and validate signal changes for our DESS signal during heating of an egg.

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