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

Title:

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

Creator:

Nakashima, Yoshito

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:e0f8efbd-2bd0-474c-8b24-658fc8ac5b16
uuid:e0f8efbd-2bd0-474c-8b24-658fc8ac5b16
doi:10.2478/johh-2013-0043

Subject:

beam hardening artifact, contrast agent, Darcy flow, porous media, sodium polytungstate (SPT), and X-ray CT

Type:

model:article and TEXT

Format:

bez média and svazek

Description:

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.

Language:

Slovak

Rights:

http://creativecommons.org/licenses/by-nc-sa/4.0/
policy:public

Coverage:

347-351

Source:

Journal of hydrology and hydromechanics | 2013 Volume:61 | Number:4

Harvested from:

CDK

Metadata only:

false