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Background Quantification of interstitial fibrosis by T1-mapping continues to gather momentum clinically with the recognition that extracellular volume fraction (ECV) measurements are pathologically elevated in a range of conditions. Well-known dependence of ECV estimation on imaging parameters requires quality-control by T1 phantoms[1-3]. These typically comprise agarose with NiCl[2] doping,[4] and are often used short-term, but with limited long-term data[5]. Such phantoms might assure long-term stability (over years) of methods applied in patients eg against scanner alterations. We therefore sought to assess their long-term T1 and T2 stability.

Temporal stability of gel relaxation-time phantoms for quality control of T1 and extracellular volume fraction measurements