Calibration method for a spectral computerized tomography system
| DWPI Title: Tomographic image reconstruction method for computerized tomography system, involves reconstructing tomographic image from projection data, and reconstructing three-dimensional visualizations of objects from reconstruction |
| Abstract: 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. |
| Use: Tomographic image reconstruction method for a computerized tomography system. |
| Advantage: The method effectively reconstructs the three-dimensional visualizations of objects from scans obtained using x-rays or other penetrating radiation. The method reduces the number of scans needed for full system characterization, and preserves essential information in the compression of the system operator to reconstruct the object from a sinogram. |
| Novelty: The tomographic image reconstruction method involves providing projection data as input to an iterative image reconstruction algorithm resident on a digital processing device. The algorithm is run by retrieving a priori system information (APSI) from a computer-accessible storage medium and utilizing the retrieved APSI, where the APSI comprises point spread functions (PSFs) of all voxels in a voxelization of a field of view. Each retrieved PSF is retrieved in the form of a vector of parameters. The APSI is utilized by decompressing each retrieved vector to generate a discretized point spread function. |
| Filed: 12/16/2021 |
| Application Number: US17553221A |
| Tech ID: SD 14833.1 |
| This invention was made with Government support under Contract No. DE-NA0003525 awarded by the United States Department of Energy/National Nuclear Security Administration. The Government has certain rights in the invention. |
| Data from Derwent World Patents Index, provided by Clarivate All rights reserved. Republication or redistribution of Clarivate content, including by framing or similar means, is prohibited without the prior written consent of Clarivate. Clarivate and its logo, as well as all other trademarks used herein are trademarks of their respective owners and used under license. |