Dr. Paul C. Johns Profile

Dr. Paul C. Johns

Emeritus Professor at Carleton Univ

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Publications (9)

Proceedings Article | 7 June 2024 Presentation + Paper

Spectrum optimization for x-ray dual-mode imager comprising radiography and coherent scatter

David Kemdirim, Paul Johns

Proceedings Volume 13043, 1304303 (2024) https://doi.org/10.1117/12.3005049

KEYWORDS: X-rays, X-ray imaging, Signal attenuation, Physical coherence, Optical coherence

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Proceedings Article | 18 May 2020 Presentation + Paper

Design and development of a rotating-anode x-ray tube coherent scatter projection imaging system

Christopher Dydula, Tong Xu, Paul Johns

Proceedings Volume 11404, 1140408 (2020) https://doi.org/10.1117/12.2554209

KEYWORDS: X-rays, Imaging systems, X-ray imaging, X-ray detectors, Scattering, Collimators, Data acquisition, Rayleigh scattering, X-ray diffraction, X-ray medical imaging, X-ray sources, Prototyping

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Proceedings Article | 29 August 2017 Paper

Photon-counting detectors for digital radiography and x-ray computed tomography

Paul Johns

Proceedings Volume 10313, 103133P (2017) https://doi.org/10.1117/12.2283929

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Proceedings Article | 29 August 2017 Paper

Medical x-ray imaging with scattered photons

Paul Johns

Proceedings Volume 10313, 103133L (2017) https://doi.org/10.1117/12.2283925

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Proceedings Article | 9 March 2017 Paper

Accelerated x-ray scatter projection imaging using multiple continuously moving pencil beams

Christopher Dydula, George Belev, Paul Johns

Proceedings Volume 10132, 101324J (2017) https://doi.org/10.1117/12.2253720

KEYWORDS: X-rays, X-ray imaging, Scattering, Synchrotrons, Prototyping, Data acquisition, Algorithm development, Image system modeling, Rayleigh scattering, Radiology, Sensors, Motion models, Statistical modeling

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Proceedings Article | 5 May 2012 Paper

Coherent x-ray scatter projection imaging using an array of monoenergetic pencil beams

Karl Landheer, Paul Johns

Proceedings Volume 8358, 83581O (2012) https://doi.org/10.1117/12.918666

KEYWORDS: X-ray imaging, Sensors, Photons, X-rays, Imaging arrays, Collimators, Fluctuations and noise, Synchrotrons, Digital filtering, Expectation maximization algorithms

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