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Abstract #2580

Pressure Dependent Signal Enhancement in Hyper-CEST

Wolfgang Kilian1, Lorenz Mitschang1, Christian Freund2, Andreas Schlundt2

1Physikalisch-Technische Bundesanstalt (PTB), Abbestr. 2-12, 10587 Berlin, Germany; 2Leibnizinstitut fr Molekulare Pharmakologie (FMP), Robert-Rssle-Str. 10, 13125 Berlin, Germany

The so called hyper-CEST method promises tremendous potential on molecule-specific MR imaging using hyperpolarized 129Xe caged in functionalized cryptophane cages. Here we present a model which allows for an optimization of the hyper-CEST sensitivity in biosensor applications, by variation of the xenon concentration in the solution. To evaluate the model we have performed hyper-CEST measurements on samples with 5 μM and 0.5 μM biosensor concentrations and varied the dissolved xenon concentration. This comparison shows that 50 nM biosensor concentrations should be detectable within a volume of 1 ml with high sensitivity.