| Title: |
Semi-analytic off-axis X-ray source model |
| Authors: |
Shamshad, M; Anjomrouz, M; Smithies, DJ; Largeau, A; Lu, G; Atharifard, A; Vanden Broeke, L; Aamir, R; Panta, RK; Walsh, MF; Goulter, BP; Healy, JL; Bheesette, S; Bell, ST; Bateman, CJ; Butler, APH; Butler, PH |
| Publisher Information: |
IOP Publishing Ltd on behalf of Sissa Medialab and CERN |
| Collection: |
Lincoln University (New Zealand): Lincoln U Research Archive |
| Subject Terms: |
medical-image reconstruction methods and algorithms; computer-aided diagnosis; models and simulations; radiation calculations; x-ray generators and sources; ANZSRC::090303 Biomedical Instrumentation; ANZSRC::0903 Biomedical Engineering; ANZSRC::40 Engineering; ANZSRC::51 Physical sciences |
| Description: |
Spectral computed tomography (CT) systems are employed with energy-resolving photon counting detectors. Incorporation of a spectrally accurate x-ray beam model in image reconstruction helps to improve material identification and quantification by these systems. Using an inaccurate x-ray model in spectral reconstruction can lead to severe image artifacts, one of the extreme cases of this is the well-known beam-hardening artifacts. An often overlooked spectral feature of x-ray beams in spectral reconstruction models is the angular dependence of the spectrum with reference to the central beam axis. To address these factors, we have developed a parameterized semi-analytical x-ray source model in the diagnostic imaging range (30-120 kVp) by applying regression techniques to data obtained from Monte Carlo simulations (EGSnrc). This x-ray beam model is generalized to describe the off-axis spectral information within ±17° along θ (vertical direction), ±5° along φ (horizontal direction) of the central axis, and can be parameterized for specific x-ray tube models. Comparisons of our model with those generated by SpekCalc, TOPAS, and IPEM78 at central axis show good agreement (within 2 %). We have evaluated the model with experimental data collected with a small animal spectral scanner. |
| Document Type: |
article in journal/newspaper |
| File Description: |
25 pages |
| Language: |
English |
| Relation: |
The original publication is available from IOP Publishing Ltd on behalf of Sissa Medialab and CERN - https://doi.org/10.1088/1748-0221/12/10/P10013 - https://doi.org/10.1088/1748-0221/12/10/p10013; Journal of Instrumentation; https://doi.org/10.1088/1748-0221/12/10/P10013; https://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=elements_prod&SrcAuth=WosAPI&KeyUT=WOS:000414167100013&DestLinkType=FullRecord&DestApp=WOS_CPL; FL4AB (isidoc); https://hdl.handle.net/10182/9095 |
| DOI: |
10.1088/1748-0221/12/10/P10013 |
| Availability: |
https://hdl.handle.net/10182/9095; https://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=elements_prod&SrcAuth=WosAPI&KeyUT=WOS:000414167100013&DestLinkType=FullRecord&DestApp=WOS_CPL; https://doi.org/10.1088/1748-0221/12/10/P10013 |
| Rights: |
© 2017 CERN. Published by IOP Publishing Ltd on behalf of Sissa Medialab. Original content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. ; https://creativecommons.org/licenses/by/4.0/ ; Attribution |
| Accession Number: |
edsbas.D8B250E0 |
| Database: |
BASE |