The identification of vignetted sources in coded aperture imaging

Details The identification of vignetted sources in coded aperture imaging The identification of vignetted sources in coded aperture imaging

Oct 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...185..343s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 185, no. 1-2, Oct. 1987, p. 343-348.

Astronomy and Astrophysics

Astronomy

4

Apertures, Gamma Ray Telescopes, High Resolution, Image Processing, Vignetting, Coding, Field Of View, Gamma Ray Astronomy, Iterative Solution, Monte Carlo Method

Scientific paper

The next generation of gamma-ray telescopes will utilise the technique of coded apertures in order to provide high resolution images of the celestial sphere. This method, however, suffers from a disadvantage wherein vignetted sources are reconstructed in false positions with incorrect intensities. Most techniques of identifying these sources involve the use of time consuming iterative computer algorithms. One recent suggestion, however, allows fast decoding which is also accurate when there are a limited number of sources in the field of view and a high background level, as is the case for contemporary low energy gamma-ray instruments. This method has been examined in detail by means of Monte-Carlo simulation in order to assess its accuracy and sensitivity.

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