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Calibration method for a spectral computerized tomography system

Patent ·
OSTI ID:1892668
; ; ; ;
A calibration method for an x-ray computerized tomography system and a method of tomographic reconstruction are provided. The calibration method includes steps of measuring at least one point spread function (PSF) at each of a plurality of points, compressing each PSF, and in one or more storing operations, storing the compressed PSFs in a computer-accessible storage medium. The PSF measurements are made in a grid of calibration points in a field of view (FOV) of the system. In the measuring step, an absorber is positioned at each of the calibration points, and an x-ray projection is taken at least once at each of those absorber positions. In the method of tomographic image reconstruction, projection data from an x-ray tomographic projection system are input to an iterative image reconstruction algorithm. The algorithm retrieves and utilizes a priori system information (APSI) The APSI comprises comprising point spread functions (PSFs) of all voxels in a voxelization of the field of view that are compressed in the form of vectors of parameters. For utilization, each retrieved vector of parameters is decompressed so as to generate a discretized PSF.
Research Organization:
Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
DOE Contract Number:
NA0003525
Assignee:
National Technology & Engineering Solutions of Sandia, LLC (Albuquerque, NM)
Patent Number(s):
11,263,792
Application Number:
16/725,549
OSTI ID:
1892668
Country of Publication:
United States
Language:
English

References (7)

Particle and Heavy Ion Transport code System, PHITS, version 2.52 journal September 2013
Correction for beam hardening in computed tomography journal January 1979
An iterative maximum-likelihood polychromatic algorithm for CT journal January 2001
Fully 3-D PET reconstruction with system matrix derived from point source measurements journal July 2006
Leveraging multi-channel x-ray detector technology to improve quality metrics for industrial and security applications conference September 2017
A geometric calibration method for cone beam CT systems journal May 2006
High-Fidelity Calibration and Characterization of Hyperspectral Computed Tomography System report September 2019

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