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Abstract #2207

Ultra-Low-Field Spin Manipulation for Precise Flip-Angle and T$$$_1$$$-Determination

Kilian Wolfgang1, Frank Seifert1, Silvia Knappe-Gr√ľneberg1, Jens Voigt1, Eva Al-Dabbagh1, and Isaac Fan1

1Physikalisch-Technische Bundesanstalt (PTB), Braunschweig and Berlin, Germany

Two distinct methods for precise flip angle determination for hyperpolarized rare gas samples are presented and were performed in ultra low magnetic field environment ($$$\approx\,\mu$$$T). The repetitive coherent excitation method is rather fast and allows for preserving most of the initial polarization whereas the incoherent excitation method is time consuming but determines the relaxation parameters $$$T_1$$$ and $$$T_2^\star$$$ inherently.

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