  We investigate a hybrid inverse problem in fluorescence ultrasound modulated
optical tomography (fUMOT) in the diffusive regime. We prove that the
absorption coefficient of the fluorophores at the excitation frequency and the
quantum efficiency coefficient can be uniquely and stably reconstructed from
boundary measurement of the photon currents, provided that some background
medium parameters are known. Reconstruction algorithms are proposed and
numerically implemented as well.
