Three-dimensional image reconstruction using transmission and scatter radiography methods

A method for image reconstruction includes irradiating an object with a beam of radiation from a radiation source, measuring an attenuated portion of the beam, estimating a density of the object, determining a predicted attenuated portion of the beam using the density estimate, and iteratively adjus...

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Bibliographische Detailangaben
Hauptverfasser:	Grissom, Gregory Thomas, Baciak, James Edward, Liesenfelt, Michael John
Format:	Patent
Sprache:	eng
Schlagworte:	CALCULATING COMPUTING COUNTING IMAGE DATA PROCESSING OR GENERATION, IN GENERAL INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES MEASURING PHYSICS TESTING
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Beschreibung
Zusammenfassung:	A method for image reconstruction includes irradiating an object with a beam of radiation from a radiation source, measuring an attenuated portion of the beam, estimating a density of the object, determining a predicted attenuated portion of the beam using the density estimate, and iteratively adjusting the density estimate of the object. The predicted attenuated portion and the measured attenuated portion are compared to determine a signal difference. The density estimate of each portion of the object is adjusted by scaling the density estimate using the average signal differences of rays that intersect the portion of the object. The density estimate may be repeatedly adjusted until a difference between consecutive density estimates is below a selected threshold or a predetermined number of adjustments have been completed. The attenuated portion of the beam may include a scattered portion and a transmitted portion.