The use of sodium polytungstate as an X-ray contrast agent to reduce the beam hardening artifact in hydrological laboratory experiments

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Title:The use of sodium polytungstate as an X-ray contrast agent to reduce the beam hardening artifact in hydrological laboratory experiments
Creators:
Nakashima, Yoshito; nakashima dot yoshito at aist dot go dot jp; National Institute of Advanced Industrial Science and Technology (AIST), Geological Survey of Japan, Central 7, Higashi 1-1-1, Tsukuba, Ibaraki 305-8567, Japan.
Journal or Publication Title:
Journal of Hydrology and Hydromechanics, 61, 4, pp. 347-351
Uncontrolled Keywords:beam hardening artifact, contrast agent, darcy flow, porous media, sodium polytungstate (SPT), X-ray CT

Abstract

Iodine is conventionally used as a contrast agent in hydrological laboratory experiments using polychromatic X-ray computed tomography (CT) to monitor two-phase Darcy flow in porous geological media. Undesirable beam hardening artifacts, however, render the quantitative analysis of the obtained CT images difficult. CT imaging of porous sand/bead packs saturated with iodine and tungsten-bearing aqueous solutions, respectively, was performed using a medical CT scanner. We found that sodium polytungstate (Na6H2W12O40) significantly reduced the beam hardening compared with potassium iodide (KI). This result is attributable to the location of the K absorption edge of tungsten, which is nearer to the peak of the polychromatic X-ray source spectrum than that of iodine. As sodium polytungstate is chemically stable and less toxic than other heavy element bearing compounds, we recommend it as a promising contrast agent for hydrological CT experiments.

Official URL: http://147.213.145.2/vc/vc1.asp

Title:The use of sodium polytungstate as an X-ray contrast agent to reduce the beam hardening artifact in hydrological laboratory experiments
Translated title:The use of sodium polytungstate as an X-ray contrast agent to reduce the beam hardening artifact in hydrological laboratory experiments
Creators:
Nakashima, Yoshito; nakashima dot yoshito at aist dot go dot jp; National Institute of Advanced Industrial Science and Technology (AIST), Geological Survey of Japan, Central 7, Higashi 1-1-1, Tsukuba, Ibaraki 305-8567, Japan.
Uncontrolled Keywords:beam hardening artifact, contrast agent, darcy flow, porous media, sodium polytungstate (SPT), X-ray CT
Subjects:T Technology > TA Engineering (General). Civil engineering (General)
Divisions:Mathematics, Physics and Earth Sciences > Institute of Hydrodynamics > Journal of Hydrology and Hydromechanics
Journal or Publication Title:Journal of Hydrology and Hydromechanics
Volume:61
Number:4
Page Range:pp. 347-351
ISSN:0042-790X
Publisher:Institute of Hydrology of the Slovak Academy of Sciences and the Institute of Hydrodynamics of the Academy of Sciences of the Czech Republic
Related URLs:
URLURL Type
http://avi.lib.cas.cz/node/55Publisher
ID Code:8178
Item Type:Article
Deposited On:05 Jun 2014 18:29
Last Modified:05 Jun 2014 16:29

Citation

Nakashima, Yoshito (2013) The use of sodium polytungstate as an X-ray contrast agent to reduce the beam hardening artifact in hydrological laboratory experiments. Journal of Hydrology and Hydromechanics, 61 (4). pp. 347-351. ISSN 0042-790X

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