Keywords: Safety, Electromagnetic Tissue Properties, SAR, Safety, EPT
Motivation: SAR monitoring and assessment rely on simulations, which are impractical for real-time clinical use due to high computational demands.
Goal(s): To validate a method for obtaining subject-specific SAR maps from standard MRI sequences.
Approach: SAR maps were generated from the complex B1+ field derived from B1 magnitude (XFL) and phase of a bSSFP sequence. Tissue conductivity was estimated using a phase-based Helmholtz electrical properties tomography (EPT) approach, and the electric field was calculated with Ampère’s law.
Results: SAR maps that align with simulation results were produced in 12 minutes, an advancement toward real-time SAR measurement (r=0.52).
Impact: A method for image-based patient-specific SAR mapping retrieved from acquired MRI data in the brain is demonstrated. The resulting maps aligned with electromagnetic simulation-based SAR maps, representing a step toward practical SAR monitoring during clinical examinations.
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