Abstract: A wrist-watch back case for replacing existing back case of a timekeeping device or to be attached thereto is provided. The back case comprises a casing comprising a bottom wall and a side wall thereby defining an inner empty space, at least five openings at the bottom wall, an optoelectronic board, at least two paired radiation sources and at least one radiation detector. Methods for measuring biomarkers, systems and a watchband are also provided.

Abstract: A system for optical tomography includes an apparent light source adapted to project excitation light toward a specimen having fluorescent proteins therein, wherein the excitation light enters the specimen becoming intrinsic light within the specimen, wherein the intrinsic light is adapted to excite fluorescent light from the fluorescent proteins, and wherein the intrinsic light and the fluorescent light are diffuse. A method of optical tomography includes generating the excitation light with the apparent light source, wherein the intrinsic light and the fluorescent light are diffuse.

Abstract: A system for optical tomography includes an apparent light source adapted to project excitation light toward a specimen having fluorescent proteins therein, wherein the excitation light enters the specimen becoming intrinsic light within the specimen, wherein the intrinsic light is adapted to excite fluorescent light from the fluorescent proteins, and wherein the intrinsic light and the fluorescent light are diffuse. A method of optical tomography includes generating the excitation light with the apparent light source, wherein the intrinsic light and the fluorescent light are diffuse.