Coded aperture imaging using imperfect detector systems

Byard, Kevin; Ramsden, D.

doi:10.1016/0168-9002(94)90292-5

Cited by 8 publications

(2 citation statements)

References 16 publications

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“…(2) for each plane and finally we add the data from the matrix T to the corresponding voxels from the planes of I z to produce the final decoded images. Note that this is similar to the technique used to remove artifacts from coded aperture systems having imperfect detectors in [18] and is similar to the CLEAN algorithm used in radio astronomy [14] but we here operate in the detector shadowgram domain rather than the final reconstructed image domain. For ease of discussion we hereafter refer to the whole image processing technique as z-Clean, with processed images being referred to as having been z-Cleaned.…”

Section: Image Processing Technique: Z-cleanmentioning

confidence: 99%

Application of the CLEAN algorithm to three dimensional coded aperture imaging

Byard

2021

Nuclear Instruments and Methods in Physics Research Section A:

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Preprint submitted to ElsevierSeptember 30, 2020 ratio (SNR) of the sources. For the strongest source and using the continuous detector the SNR increases unexpectedly to give values higher than that for observations made only in the critical plane due to the ghosting of this source in other planes at different depths. For all other cases there is a decrease in SNR which is more marked for finer plane separations and for weaker sources.

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Section: Image Processing Technique: Z-cleanmentioning

confidence: 99%

Application of the CLEAN algorithm to three dimensional coded aperture imaging

Byard

2021

Nuclear Instruments and Methods in Physics Research Section A:

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“…This arrangement has the desirable property that artifactfree images can be reconstructed by simple correlation techniques (Gunson & Polychronopulos 1976;Fenimore & Cannon 1978). If the detector plane is not completely filled, many of the advantages of a URA mask disappear, and correlation techniques produce images with significant artifacts (Byard & Ramsden 1994). For the proposed spherical geometry with a significantly incomplete detection "plane", it is not immediately apparent whether analogues of the URA can be constructed.…”

Section: Introductionmentioning

confidence: 99%

X-ray all-sky monitoring and transient detection using a coded sphere telescope

Bird

Merrifield

1996

Astron. Astrophys. Suppl. Ser.

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Abstract. -We present a design for a hard X-ray all-sky monitor which consists of a spherical structure whose surface is partially covered by circular units which serve the dual purpose of detector and mask elements, forming a coded aperture telescope with full 4π steradian coverage. We demonstrate that a simple practical implementation of this geometry results in an instrument which is capable of measuring the fluxes in the 10−20 keV bandpass of the hundred brightest sources in the sky at least every two days. We also show how this instrument can be used to image burst and transient sources; obtain their positions with arcminute accuracy; and follow their light curves throughout their lifetimes.

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