Abstract: A scanning X-ray imaging system produces an image of the transmissivity of objects by producing a relative motion of the object generally perpendicular to the triangular planes joining an X-ray point source and M X-ray line detectors, where M is equal to or greater than 1; these X-rays pass through a scanning slit assembly. The scanning slit assembly generally includes a plane of X-ray opaque material having N sets of line slits, where N is equal to or greater than 2, each set containing M identical line slits. The scanning slit assembly, in addition, includes a rotating X-ray opaque material containing N uniquely different sets of radial slits, each set containing identical radial slits. Each of the N sets of radial slits is uniquely paired with each of the N sets of line slits. During any scan of an object, M detectors, M line slits and one of the N sets of radial slits are used. The scanning X-ray imaging system provides N selections in image resolution of the scanned object.

Abstract: Inert gas under pressure forces a suspension of particles in a carrier fluid through a flow channel including tubes of narrow diameter at a pressure high enough to establish laminar flow free from turbulence at a speed determined by a constant displacement rate syringe at the downstream end of the flow channel. At at least two locations along the flow channel measurements are made of particle conditions, such as radioactivity and size, to provide a multiple of particle signals which are correlated to provide a multi-dimensional characterization of the particles, such as the number of cells exceeding a predetermined radioactivity level for each of a number of cell size ranges.