Browsing by Author "Evans, J. Paul O."

Browsing by Author "Evans, J. Paul O."

Sort by: Order: Results:

  • Classification of fracture and non-fracture groups by analysis of coherent X-ray scatter 
    Dicken, A. J.; Evans, J. Paul O.; Rogers, Keith; Stone, N.; Greenwood, Charlene; Godber, S. X.; Clement, J. G.; Lyburn, Iain Douglas; Martin, R. M.; Zioupos, Peter (Nature Publishing Group, 2016-07-01)
    Osteoporotic fractures present a significant social and economic burden, which is set to rise commensurately with the aging population. Greater understanding of the physicochemical differences between osteoporotic and ...
  • Combined X-ray diffraction and absorption tomography using a conical shell beam 
    Shevchuk, Alex; Evans, J. Paul O.; Dicken, A. J.; Elarnaut, D.; Downes, D.; Godber, S. X.; Rogers, Keith D. (2019-07-15)
    We combine diffraction and absorption tomography by raster scanning samples through a hollow cone of pseudo monochromatic X-rays with a mean energy of 58.4 keV. A single image intensifier takes 90x90 (x,y) snapshots during ...
  • Confocal energy-dispersive X-ray diffraction tomography employing a conical shell beam 
    Dicken, Anthony; Evans, J. Paul O.; Rogers, Keith; Prokopiou, Danae; Godber, Simon; Elarnaut, F.; Shevchuk, Alex; Downes, D.; Wilson, M. (Optical Society of America, 2019-07-01)
    We introduce a new high-energy X-ray diffraction tomography technique for volumetric materials characterization. In this method, a conical shell beam is raster scanned through the samples. A central aperture optically ...
  • Conical shell X-ray beam tomosynthesis and micro-computed tomography for microarchitectural characterisation 
    Arnold, Emily; Elarnaut, Farid; Downes, David; Evans, J. Paul O.; Greenwood, Charlene; Rogers, Keith D. (Springer Nature, 2023-12-06)
    Bone quality is commonly used to diagnose bone diseases such as osteoporosis, with many studies focusing on microarchitecture for fracture prediction. In this study a bovine distal femur was imaged using both micro-computed ...
  • Depth resolved snapshot energy-dispersive X-ray diffraction using a conical shell beam 
    Dicken, A. J.; Evans, J. Paul O.; Rogers, Keith; Prokopiou, Danae; Godber, S. X.; Wilson, M. (Optical Society of America, 2017-08-23)
    We demonstrate a novel imaging architecture to collect range encoded diffraction patterns from overlapping samples in a single conical shell projection. The patterns were measured in the dark area encompassed by the beam ...
  • Fracture toughness of the cancellous bone of FNF femoral heads in relation to its microarchitecture 
    Greenwood, Charlene; Clements, J. G.; Dicken, A. J.; Evans, J. Paul O.; Lyburn, Iain Douglas; Martin, R. M.; Rogers, Keith; Stone, N.; Adams, G.; Zioupos, Peter (European Society of Biomechanics, 2016-07)
    This study considers the relationship between microarchitecture and mechanical properties for cancellous bone specimens collected from a cohort of patients who had suffered fractured necks of femur. OP is an acute skeletal ...
  • Investigating pair distribution function use in analysis of nanocrystalline hy­droxy­apatite and carbonate-substituted hy­droxy­apatite 
    Arnold, Emily; Keeble, Dean S.; Evans, J. Paul O.; Greenwood, Charlene; Rogers, Keith D. (International Union of Crystallography, 2022-04-14)
    Hy­droxy­apatite (HA) is a com­plex material, which is often nanocrystalline when found within a biological setting. This work has directly com­pared the structural characteristics derived from data collected using a ...
  • Sparse interleaved sampling for high resolution focal construct geometry X-ray tomography 
    Evans, J. Paul O.; Elarnaut, F.; Downes, D.; Lee, W. K.; Arnold, Emily; Rogers, Keith (Optical Society of America, 2023-04-24)
    We demonstrate interleaved sampling by multiplexing conical subshells within the tomosynthesis and raster scanning a phantom through a 150 kV shell X-ray beam. Each view comprises pixels sampled on a regular 1 mm grid, ...
  • X-ray absorption tomography employing a conical shell beam 
    Evans, J. Paul O.; Godber, S. X.; Elarnaut, F.; Downes, D.; Dicken, A. J.; Rogers, Keith (Optical Society of America, 2016-12-12)
    We demonstrate depth-resolved absorption imaging by scanning an object through a conical shell of X-rays. We measure ring shaped projections and apply tomosynthesis to extract optical sections at different axial focal plane ...