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Iterative scatter correction based on artifact assessment
SPIE Proceedings, 2008In this paper we propose a novel scatter correction methodology for X-ray based cone-beam CT that allows to combine the advantages of projection-based and volume-based correction approaches. The basic idea is to use a potentially non-optimal projection-based scatter correction method and to iteratively optimize its performance by repeatedly ...
Jens Wiegert +2 more
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Surface Stone Artifact Scatters, Settlement Patterns, and New Methods for Stone Artifact Analysis
Journal of Paleolithic Archaeology, 2019Movement and mobility are key properties in understanding what makes us human and so have been foci for archeological studies. Stone artifacts survive in many contexts, providing the potential for understanding landscape use in the past through studies of mobility and settlement pattern.
Simon J. Holdaway, Benjamin Davies
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Multivariate visualization and analysis of photomapped artifact scatters
Journal of Archaeological Science, 2006Simultaneous analysis of relationships between multiple artifact classes is required for characterization of many types of activity areas. This paper illustrates improved forms of multivariate visualization, spatial analysis and integration of experimental results that are possible with GIS based photomapping.
Craig, Nathan +2 more
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Artifact Scatters and Subsistence Organization
Journal of Field Archaeology, 1995AbstractAs a class of archaeological remains, artifact scatters, though frequently abundant in regional archaeological records, are often ambiguous with respect to their origins. Consequently, with few exceptions their suspected usefulness in furnishing data that pertain to regional research issues, such as the organization of prehistoric subsistence ...
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Solving protein nanocrystals by cryo-EM diffraction: Multiple scattering artifacts
Ultramicroscopy, 2015The maximum thickness permissible within the single-scattering approximation for the determination of the structure of perfectly ordered protein microcrystals by transmission electron diffraction is estimated for tetragonal hen-egg lysozyme protein crystals using several approaches.
Ganesh, Subramanian +4 more
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Correlation artifacts in speed of sound estimation in scattering media
Ultrasound in Medicine & Biology, 1989A recently described method for speed of sound estimation in tissues in pulse-echo mode involves reception of echoes generated by an ultrasonic pulse by means of a linearly tracking transducer. When the peaks of echo amplitudes are used as markers of arrival time, stairstep-like artifacts appear in the echo arrival time vs.
J, Ophir +4 more
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Geoarchaeology, 2001
AbstractSurface scatters of Aboriginal stone artifacts have been exposed in many parts of inland Australia by accelerated erosion that followed the introduction of pastoralism by European settlers in the 19th century. This paper reports on a set of techniques developed to investigate and quantify the effects of these post‐discard disturbance processes ...
Patricia Fanning, Simon Holdaway
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AbstractSurface scatters of Aboriginal stone artifacts have been exposed in many parts of inland Australia by accelerated erosion that followed the introduction of pastoralism by European settlers in the 19th century. This paper reports on a set of techniques developed to investigate and quantify the effects of these post‐discard disturbance processes ...
Patricia Fanning, Simon Holdaway
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Light-scattering-induced artifacts in a complex polymer gel dosimetry phantom
Applied Optics, 2009Certain polymer gels become turbid on exposure to ionizing radiation, a property exploited in medical dosimetry to produce three-dimensional dose maps for radiotherapy. These maps can be read using optical computed tomography (CT). A test phantom of complex shape ("layered tube") was developed to investigate the optical properties of polymer gel ...
Stephen G, Bosi +2 more
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Speckle and Shadow Artifacts Reduction in Scattering-Based Light Sheet Microscopy
Biophotonics Congress: Optics in the Life Sciences 2023 (OMA, NTM, BODA, OMP, BRAIN), 2023Scattering-based light sheet microscopy (sLSM) using a laser had challenges with speckle noise and shadow artifacts. We developed an LED-based sLSM setup that significantly reduces speckle noise and shadow artifacts.
J. Zhao +5 more
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A practical correction of scatter-related artifacts in SPECT reconstruction
SPIE Proceedings, 2007We have observed that an expectation maximization (EM) algorithm applied to SPECT reconstruction may produce hotspot artifacts of varying intensity. Our hypothesis was that scatter caused these artifacts. To test this assumption, we studied the performance of forward- and back-projection procedures in the EM algorithm for simulated and experimental ...
Hongwei Ye +5 more
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