The authors present a tomographic imaging technique of fluorescence in light-scattering media. Ultrasonic modulation of fluorescence based on the interaction between ultrasound and light is applied for imaging of a fluorescent material by scanning a focused sound field in which the light is modulated selectively. The on-axis sound-field characteristics that affect the light by modulating its amplitude (through variation of the refractive index and the scattering coefficient) were determined. That imaging technique is demonstrated using tissue phantoms that contain localized fluorescent regions in a dense scattering medium, suggesting the applicability of this technique for visualization of fluorescent probes in biological tissues.

The microscopic structure of the Wigner-Seitz (W-S) cell in the inner crust of neutron stars is investigated with the relativistic mean field (RMF) approach. The W-S cell is composed of a cluster of neutrons and protons localized in a region around the centre and surrounded by a neutron gas of approximately uniform density. In order to generate the density of the W-S cell, appropriate boundary conditions in the calculation of the single-particle wavefunctions are necessary. We emphasize on the choice of the boundary conditions in the RMF approach. Three kinds of boundary conditions are suggested. The properties of the W-S cell with the three kinds of boundary conditions are investigated. The neutron density distributions in the RMF and Hartree-Fock-Bogoliubov (HFB) models are compared. It is found that the neutron gas densities of the W-S cell in the RMF model is higher than those obtained in the HFB model.