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A digitally reconstructed radiograph algorithm calculated from first principles
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10.1118/1.4769413
/content/aapm/journal/medphys/40/1/10.1118/1.4769413
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/40/1/10.1118/1.4769413
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Plot of LAC vs CT number data points and 2nd order polynomial fits generated from attenuation measurements of different plug materials. Attenuation measurements are either uncorrected or fully corrected for scatter, beam hardening, and veiling glare effects.

Image of FIG. 2.
FIG. 2.

Projections through a Catphan CT phantom at a projection angle of 0°. (a) uncorrected DRR, (b) fully corrected DRR, (c) actual CBCT projection. Red lines in (c) indicate locations where line profiles are sampled.

Image of FIG. 3.
FIG. 3.

Projections through a patient at a projection angle of 92.67°. (a) Uncorrected DRR, (b) fully corrected DRR, and (c) actual CBCT projection. Red lines in (c) indicate locations where line profiles are sampled.

Image of FIG. 4.
FIG. 4.

Projections through a patient at a projection angle of 178.93°. (a) Uncorrected DRR, (b) fully corrected DRR, and (c) actual CBCT projection. Red lines in (c) indicate locations where line profiles are sampled.

Image of FIG. 5.
FIG. 5.

Comparison of line profiles sampled from an actual CBCT projection, a DRR uncorrected for beam hardening, scatter, or veiling glare, and a fully corrected DRR. Projections are taken through a Catphan CT phantom at a projection angle of 0°. Line profiles are sampled at (a) row 48, (b) row 284, and (c) row 582.

Image of FIG. 6.
FIG. 6.

Comparison of line profiles sampled from an actual CBCT projection, a DRR uncorrected for beam hardening, scatter, or veiling glare, and a fully corrected DRR. Projections are taken through an actual patient at a projection angle of 92.67°. Line profiles are sampled at (a) row 145, (b) 360, and (c) row 630.

Image of FIG. 7.
FIG. 7.

Comparison of line profiles sampled from an actual CBCT projection, a DRR uncorrected for beam hardening, scatter, or veiling glare, and a fully corrected DRR. Projections are taken through an actual patient at a projection angle of 178.93°. Line profiles are sampled at (a) row 145, (b) 360, and (c) row 630.

Image of FIG. 8.
FIG. 8.

Histograms comparing the intensity distributions of actual CBCT projections, DRRs uncorrected for beam hardening, scatter, or veiling glare, and fully corrected DRRs. Comparisons are for projections cast through (a) a patient at a projection angle of 92.67°, (b) a patient at a projection angle of 178.93°, and (c) a Catphan CT phantom at a projection angle of 0°. In (a) and (b) areas of the projections contaminated by the treatment couch are omitted from the distributions. In (c) areas of the projections contaminated by metal artifacts in the FBCT image are omitted from the distributions.

Image of FIG. 9.
FIG. 9.

Line profiles sampled from projections cast through Catphan CT phantom for comparison of two different beam hardening correction methods. Line profiles are sampled at (a) row 48, (b) row 284, and (c) row 582.

Image of FIG. 10.
FIG. 10.

Scatter plots showing the correspondence between pixel intensities in actual CBCT projections and those of both corrected (black) and uncorrected (green) DRRs. The pink line indicates the track along which perfect correspondence is achieved. Scatter plots are plotted for projections cast through (a) a patient at a projection angle of 92.67°, (b) a patient at a projection angle of 178.93°, and (c) a Catphan CT phantom at a projection angle of 0°.

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/content/aapm/journal/medphys/40/1/10.1118/1.4769413
2012-12-14
2014-04-25
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: A digitally reconstructed radiograph algorithm calculated from first principles
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/40/1/10.1118/1.4769413
10.1118/1.4769413
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