Coded aperture is a technique for 2-D and 3-D imaging of radiation sources that include both focusable EM wave such as visible light and non-focusable radiation such as ionizing radiation (X-ray, Gamma ray).
These amazing feats are accomplished with the BAT's coded aperture mask and its detector array. The aperture mask is a big metal sheet with random holes in it that casts a shadow on the detector plates.
The WFC contained two coded aperture cameras operating in the 2 to 30 keV (320 to 4,800 aJ) range and each covering a region of 20 by 20 degrees on the sky.
The mirrors are usually a section of a rotated parabola. Gamma-ray telescopes give up on focusing entirely, and use coded aperture masks; the pattern of shadows the mask creates can be reconstructed to form an image.
 See also: Aperture, Telescope, Ray, Detector, X-ray
  
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