Specific absorption rate levels during 7T were simulated in Sim4life using infant and adult models. 
Sim4life
Introduction of Ultra-High-Field MR Imaging in Infants: Preparations and Feasibility.BACKGROUND AND PURPOSE
 Cerebral MR imaging in infants is usually performed with a field strength of up to 3T.  In adults, a growing number of studies have shown added diagnostic value of 7T MR imaging.  Specific absorption rate levels during 7T were simulated in Sim4life using infant and adult models.  A newly developed acoustic hood was used to guarantee hearing protection.  Acoustic noise damping of this hood was measured and compared with the 3T Nordell hood and no hood.  In this prospective pilot study, clinically stable infants, between term-equivalent age and the corrected age of 3 months, underwent 7T MR imaging immediately after their standard 3T MR imaging.  The 7T scan protocols were developed and optimized while scanning this cohort.


 Global and peak specific absorption rate levels in the infant model in the centered position and 50-mm feet direction did not exceed the levels in the adult model.  Hearing protection was guaranteed with the new hood.  Twelve infants were scanned.  No MR imaging-related adverse events occurred.  It was feasible to obtain good-quality imaging at 7T for MRA, MRV, SWI, single-shot T2WI, and MR spectroscopy.  CONCLUSIONS
 7T MR imaging is feasible in infants, and good-quality scans could be obtained.
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