Figure 4
Screen shots of the tiled sample image, as visible to the operator after an imaging scan. (a) Raw image of a pinpoint ionization chamber. The image is limited by the `imaging' mask of nominal size 20 mm × 20 mm. The crossed line cursor can be used to align the feature of interest at the center of the square mask (see text). (b) Flat-field corrected image of the same sample. In both images, white corresponds to stronger attenuation. |