Journal ArticleDOI
Gamma-ray imaging with stochastic apertures.
TLDR
A method is proposed and analyzed for gamma-ray imaging by stochastic time modulation and cross-correlation and it is seen to provide a theoretical basis for obtaining a smooth three-dimensional point response.Abstract:
The spatial distribution of a radioactive fluid can be measured indirectly by observing the emerging gamma rays. A method is proposed and analyzed for gamma-ray imaging by stochastic time modulation and cross-correlation. Theoretical comparison is made to collimation and coded aperture techniques in gamma-ray image formation. Computed results are presented that illustrate the mean response and statistical error characteristics of this technique. Monte Carlo simulations are performed as a further verification. Because it relies upon a point-by-point reconstruction, rather than upon the integral properties of any particular aperture, the time modulation approach is seen to provide a theoretical basis for obtaining a smooth three-dimensional point response.read more
Citations
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Journal ArticleDOI
An advanced coded imaging without side lobes
TL;DR: An advanced coded imaging is proposed which makes it possible to clear away the side lobes from reconstructed images by using a pair of coherent codes.
Proceedings ArticleDOI
Time encoded fast neutron/gamma imager for large standoff SNM detection
Peter Marleau,James S. Brennan,Erik Brubaker,Mark D Gerling,Aaron B. Nowack,Patricia Frances Schuster,John Steele +6 more
TL;DR: In this paper, the authors explore the use of time-modulated collimators that may lead to practical gamma-neutron imaging detector systems that are highly efficient with the potential to exhibit simultaneously high angular and energy resolution.
Proceedings ArticleDOI
Results from the coded aperture neutron imaging system
TL;DR: A coded aperture neutron imaging system (CANIS) was proposed in this article for fast-neutron imaging, which can offer a highly efficient solution for improved detection speed, range, and sensitivity.
Dissertation
A rotating modulation imager for the orphan source search problem
TL;DR: In this article, the authors explored the application of a mechanically collimated imaging device known as a rotating modulation collimator (RMC) to the orphan source search problem and developed a new system model for predicting the system response when the source is located at any distance from the detector.
Journal ArticleDOI
Gamma-ray imaging in Fourier space.
Chien Chou,Harrison H. Barrett +1 more
TL;DR: A new coded-aperture configuration for gamma-ray imaging that measures a single Fourier component of the object distribution at a time and does not require a position-sensitive detector.
References
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Journal Article
Application of a Fresnel zone plate to gamma-ray imaging.
TL;DR: The fundamental principles of holography were first set forth by Gabor in 1948 and this technique has now been applied to imaging gamma-ray sources at the suggestion of Barrett.
Journal ArticleDOI
Imaging in Nuclear Medicine with Incoherent Holography
TL;DR: In this article, the use of a lead Fresnel zone plate aperture in conjunction with an image intensifier camera to produce coded images of gamma sources is described, which possess properties similar to holograms.