Different methods of image reconstruction for portable X-ray and gamma-ray imager with coded aperture

2002 ◽  
Author(s):  
O.P. Ivanov ◽  
V.E. Stepanov ◽  
A.N. Sudarkin ◽  
L.I. Urutskoev
Keyword(s):  
Image Reconstruction ◽  
Gamma Ray ◽  
Coded Aperture ◽  
X Ray

scholarly journals In situX-ray beam imaging using an off-axis magnifying coded aperture camera system

2013 ◽  
Vol 20 (4) ◽  
pp. 596-602 ◽  
Author(s):  
Anton Kachatkou ◽  
Nicholas Kyele ◽  
Peter Scott ◽  
Roelof van Silfhout
Keyword(s):  
Image Reconstruction ◽  
Impulse Response ◽  
Finite Thickness ◽  
Incident Beam ◽  
Reconstruction Algorithm ◽  
Coded Aperture ◽  
X Ray ◽  
Image Reconstruction Algorithm ◽  
Imaging Model ◽  
Image Blur

An imaging model and an image reconstruction algorithm for a transparent X-ray beam imaging and position measuring instrument are presented. The instrument relies on a coded aperture camera to record magnified images of the footprint of the incident beam on a thin foil placed in the beam at an oblique angle. The imaging model represents the instrument as a linear system whose impulse response takes into account the image blur owing to the finite thickness of the foil, the shape and size of camera's aperture and detector's point-spread function. The image reconstruction algorithm first removes the image blur using the modelled impulse response function and then corrects for geometrical distortions caused by the foil tilt. The performance of the image reconstruction algorithm was tested in experiments at synchrotron radiation beamlines. The results show that the proposed imaging system produces images of the X-ray beam cross section with a quality comparable with images obtained using X-ray cameras that are exposed to the direct beam.

scholarly journals Coded-aperture x-ray/gamma-ray telescope for arc-minute localization of gamma-ray bursts

1999 ◽  
Author(s):  
Michael L. Cherry ◽  
Peter P. Altice, Jr. ◽  
David L. Band ◽  
James H. Buckley ◽  
T. Gregory Guzik ◽  
...  
Keyword(s):  
Gamma Ray ◽  
Gamma Ray Bursts ◽  
Coded Aperture ◽  
X Ray

FLASH X-RAY DEVICES FOR PUMPING NUCLEAR MATERIALS DEVELOPED IN THE GAMMA-RAY LASER PROGRAM AT TEXAS

1987 ◽  
Vol 48 (C9) ◽  
pp. C9-367-C9-370
Author(s):  
C. B. COLLINS ◽  
F. DAVANLOO ◽  
T. S. BOWEN ◽  
J. J. COOGAN
Keyword(s):  
Gamma Ray ◽  
Nuclear Materials ◽  
X Ray

Digital pulse processor for spectrometry of charged particles, neutrons, x-ray, and gamma-ray

2003 ◽  
Vol 8 (5-6) ◽  
pp. 60-64
Author(s):  
A.I. Arkhangelsky ◽  
◽  
Yu.D. Kotov ◽  
P.Yu. Chistiakov ◽  
◽  
...  
Keyword(s):  
Gamma Ray ◽  
Charged Particles ◽  
X Ray ◽  
Digital Pulse

A Combined Model for the X‐Ray to Gamma‐Ray Emission of Cygnus X‐1

1998 ◽  
Vol 502 (1) ◽  
pp. 428-436 ◽  
Author(s):  
Igor V. Moskalenko ◽  
Werner Collmar ◽  
Volker Schonfelder
Keyword(s):  
Gamma Ray ◽  
Combined Model ◽  
X Ray ◽  
Gamma Ray Emission

scholarly journals Aperiodic Flux Variability in A 0535+262

1996 ◽  
Vol 165 ◽  
pp. 313-319
Author(s):  
Mark H. Finger ◽  
Robert B. Wilson ◽  
B. Alan Harmon ◽  
William S. Paciesas
Keyword(s):  
Neutron Star ◽  
Gamma Ray ◽  
Beat Frequency ◽  
Power Spectra ◽  
Center Frequency ◽  
X Ray ◽  
Binary Pulsar ◽  
Transient Source ◽  
Flux Variability ◽  
Burst And Transient Source

A “giant” outburst of A 0535+262, a transient X-ray binary pulsar, was observed in 1994 February and March with the Burst and Transient Source Experiment (BATSE) onboard the Compton Gamma-Ray Observatory. During the outburst power spectra of the hard X-ray flux contained a QPO-like component with a FWHM of approximately 50% of its center frequency. Over the course of the outburst the center frequency rose smoothly from 35 mHz to 70 mHz and then fell to below 40 mHz. We compare this QPO frequency with the neutron star spin-up rate, and discuss the observed correlation in terms of the beat frequency and Keplerian frequency QPO models in conjunction with the Ghosh-Lamb accretion torque model.

Sign in / Sign up

Export Citation Format

Share Document