Scintillation imaging: a technique to reduce coding noise in scanned coded aperture imagers

Klaus P. Ziock

doi:10.1117/12.580609

21 October 2004 Scintillation imaging: a technique to reduce coding noise in scanned coded aperture imagers

Klaus P. Ziock

Proceedings Volume 5540, Hard X-Ray and Gamma-Ray Detector Physics VI; (2004) https://doi.org/10.1117/12.580609
Event: Optical Science and Technology, the SPIE 49th Annual Meeting, 2004, Denver, Colorado, United States

Abstract

Coded aperture imagers provide the optimum means to generate an all-sky survey at gamma-ray energies from 10's of keV to a few MeV. Unfortunately, such imagers are plagued by systematic noise that limits their dynamic range. In par-ticular, spatial gradients in the background radiation across the detector and imperfectly coded signals from strong point sources in the field of view add artifacts to the images. Although theoretical signal-to-noise ratios of order 10⁴ are possi-ble in perfectly coded images, real-world effects have limited performance of past imagers to significantly less than that. One technique to help remove these aberrations is the use of sequential exposures with a mask and it's inverse. However, for large instruments this is an impractical solution. In addition, it does not apply for scenes with rapidly varying sources. In a scanning instrument, one solution to this problem is to interleave the mask and anti-mask patterns in a sin-gle aperture in the direction of scan. A true source will oscillate between positive and negative images (i.e. scintillate) while spatially varying backgrounds are significantly suppressed.

Citation Download Citation

Klaus P. Ziock "Scintillation imaging: a technique to reduce coding noise in scanned coded aperture imagers", Proc. SPIE 5540, Hard X-Ray and Gamma-Ray Detector Physics VI, (21 October 2004); https://doi.org/10.1117/12.580609

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