Fig. 4.

Fluorescence x-ray projection data obtained with the three imaging modes. The object is a cylinder with features shown in Fig. 3. A: The sinogram obtained with the line-by-line scanning approach (Geom. 1 in Table I).B The projection on shown an X-ray detector in Mode 2 geometry (Table II, Geom. 7). A thin sheet-like synchrotron X-ray beam was used to irradiate the central slice of the object as shown in Fig. 1 (b). The detector is coupled to a nine-pinhole aperture. C: The projections on an X-ray was used to irradiate the object through the center as shown in Fig. 1 (c).