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. 2020 Apr;41(4):555–565. doi: 10.3174/ajnr.A6455

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© 2020 by American Journal of Neuroradiology

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Fig 2. — Phantom (A) and human in vivo PRF thermometry in a healthy volunteer (B) using the water-NAA chemical shift, demonstrating the impact of adiabatic (semiLASER) versus conventional volume localization (PRESS) and improvements in the shimming conditions using 3D gradient-echo (greSHIM). Spatially uniform phantom temperatures are noted in A with improvements in SNR, fitted line widths, and test-retest repeatability (not shown) by comparison with conventional point-resolved spectroscopy using sLASER at 3T. Greater test-retest stability obtained 30 minutes apart and the presence of physiologically meaningful temperature gradients are demonstrated to greater advantage in the lower row of B when using sLASER for spatial localization together with greSHIM. Adapted from Dehkharghani et al.,^86,88 with permission from the International Society of Magnetic Resonance in Medicine.