1887
banner image
No data available.
Please log in to see this content.
You have no subscription access to this content.
No metrics data to plot.
The attempt to load metrics for this article has failed.
The attempt to plot a graph for these metrics has failed.
On two-parameter models of photon cross sections: Application to dual-energy CT imaging
Rent:
Rent this article for
USD
10.1118/1.2349688
/content/aapm/journal/medphys/33/11/10.1118/1.2349688
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/33/11/10.1118/1.2349688

Figures

Image of FIG. 1.
FIG. 1.

Ratio of the PFM predictions to the DLC-146 reference cross-section data for selected elements. (a) Total linear attenuation coefficient (single fit); (b) total linear attenuation coefficient (double fit); (c) frequency of photoelectric absorption collisions (double fit); and (d) mass-energy absorption coefficients (double fit).

Image of FIG. 2.
FIG. 2.

Ratio of the BVM predictions to the DLC-146 reference cross-section data for the same elements shown in Fig. 1. (a) Total linear attenuation coefficient (single-basis pair); (b) total linear attenuation coefficient (double-basis pair); (c) frequency of photoelectric absorption collisions (double-basis pair); and (d) mass-energy absorption coefficients (double-basis pair). Note that (a) and (b) have a more magnified -axis scale compared with Figs. 1(a) and 1(b), while panels (c) and (d) have the same -axis scale in both Figs. 1 and 2.

Image of FIG. 3.
FIG. 3.

The MPAE (mean percent absolute error over the to energy range) of idealized dual-energy scanning of elemental materials as a function of atomic number for (a) the single- and double-basis pair BVM model and (b) the double- or single-fit PFM QDECT analysis. Total attenuation (solid line) and energy absorption (broken line) linear coefficients are shown along with frequency of photoelectric absorption for the BVM QDECT analysis only. Red lines denote double fit or basis pair and blue lines denote single fits or basis pairs.

Image of FIG. 4.
FIG. 4.

Ratios of effective to actual atomic numbers and electron densities for elements from the PFM QDECT analysis.

Image of FIG. 5.
FIG. 5.

Comparison of simulated QDECT cross-section predictions derived from the double-pair BVM [left column graphs (a), (c), and (e)] and the double-fit PFM [right column, graphs (b), (d), and (f)]. Each graph compares the QDECT prescription with the DLC-146 reference cross section for selected mixtures as a function of energy from . The top, middle, and bottom rows show, respectively, the total linear attenuation coefficient [graphs (a) and (b)], the frequency of photoelectric collisions [graphs (c) and (d)], and the mass-energy absorption coefficient [graphs (e) and (f)].

Image of FIG. 6.
FIG. 6.

Percent unexpanded uncertainty of linear attenuation coefficients at the indicated energy for PMMA (blue lines) and a sodium chlorate solution (red lines) for idealized QDECT measurements based on (a) the double basis-pair BVM and (b) the double-fit PFM. The number pairs in parentheses, shown in the legends, denote the standard deviations of the 45- and image intensities, respectively, as percentages of the attenuation coefficient relative to water.

Tables

Generic image for table
TABLE I.

Composition and physical properties of basis substances and selected mixtures used to test the BVM. Aqueous solutions are specified as percent by weight.

Generic image for table
TABLE II.

Best fit parameters for the PFM model fit to DLC-146 cross-section data for energies of and .

Generic image for table
TABLE III.

MPAE in , , and values predicted by double-pair BVM and double-fit PFM dual-energy CT analysis over the energy range for selected mixtures. The BVM partial mass densities are also tabulated.

Loading

Article metrics loading...

/content/aapm/journal/medphys/33/11/10.1118/1.2349688
2006-10-17
2014-04-18
Loading

Full text loading...

This is a required field
Please enter a valid email address
752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: On two-parameter models of photon cross sections: Application to dual-energy CT imaging
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/33/11/10.1118/1.2349688
10.1118/1.2349688
SEARCH_EXPAND_ITEM