Tissue-equivalent phantoms with well-defined T1- and T2-relaxation behaviour are often required for sequence optimisation and quality control purposes. Based on numerous T1 and T2 measurements at 3T and 7T with varying concentrations of Agarose and gadopentetate dimeglumine (Magnevist), we herein present a formula for creating phantoms with T1-values between 700 ms and 3000 ms and T2-values between 30 ms to 250 ms at both field strengths.
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