An imaging method for imaging a subject including anisotropic or fibrous structures includes acquiring a three-dimensional apparent diffusion tensor map of a region with some anisotropic structures. A separation and selection system uses a \u201crotator\u201d to release a product from a tray and a \u201cgate\u201d to separate the products into two columns on the tray. In some embodiments, for example, multiple rotary units are assembled in rotary mechanisms such that neighboring pairs of rotational components counter-rotate or contra-rotate relative to one another during operation of the rotary mechanisms. A source region is formed within the well and is an n-type impurity layer. The glove is made of absorbent material with a smooth to coarse outside surface to facilitate cleaning andor scrubbing. This configuration can provide an optical rotary probe with a simple structure and with high reliability, which is capable of suppressing optical losses and reflection ghosts.