Low field MRI offers advantages such as reduced cost and improved safety of implantable and interventional devices, and reduced RF energy deposition over high field alternatives. However, the accuracy of proton resonance frequency (PRF) thermometry suffers at low field due to reduced signal to noise ratio as well as lower temperature-sensitivity of MR phase. In this study we demonstrate that reduced off-resonance effects, increased T2* and shorter T1 associated with low field can be leveraged to achieve high quality MR thermometry in the brain and prostate at 0.55T.
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