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Sequentially reweighted TV minimization for CT metal artifact reduction
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10.1118/1.4811129
/content/aapm/journal/medphys/40/7/10.1118/1.4811129
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/40/7/10.1118/1.4811129

Figures

Image of FIG. 1.
FIG. 1.

Stage 1 SeqTV reconstructions for the digital QA phantom. (a) Ideal phantom; (b) SeqTV reconstruction (metal), sigma = 0.01, k = 10; (c) binary extraction from (b).

Image of FIG. 2.
FIG. 2.

Digital QA reconstructions for the enhanced-noise scenario. (a) SeqTV reconstruction (background), sigma = 0.1, k = 5; (b) TV reconstruction (background); (c) FDK reconstruction; (d) linear interpolation; (e) POCS reconstruction; (f) SeqTV, fused with metal mask.

Image of FIG. 3.
FIG. 3.

Digital QA reconstructions for the limited-view scenario. (a) SeqTV reconstruction (background), sigma = 0.1, k = 5; (b) TV reconstruction (background); (c) FDK reconstruction; (d) linear interpolation; (e) POCS reconstruction; (f) SeqTV, fused with metal mask.

Image of FIG. 4.
FIG. 4.

Vertical profiles of the reconstructed attenuation coefficients through the 175th column for TV and SeqTV in Figs. 2 and 3 . (a) Enhanced-noise scenario; (b) limited-view scenario.

Image of FIG. 5.
FIG. 5.

MTF curves for TV and SeqTV reconstructions in Figs. 2 and 3 , calculated from the indicated line segment. (a) Enhanced-noise scenario; (b) limited-view scenario.

Image of FIG. 6.
FIG. 6.

RMSEs for TV and SeqTV reconstructions in Figs. 2 and 3 , calculated from the indicated squares. (a) Enhanced-noise scenario; (b) limited-view scenario.

Image of FIG. 7.
FIG. 7.

Dental phantom reconstructions. (a) Ideal phantom, three circular fillings embedded with diameters 9, 8, and 7 mm; (b) SeqTV reconstruction (metal), sigma = 0.05, k = 5; (c) binary extraction from (b); (d) SeqTV reconstruction (background), sigma = 0.1, k = 5; (e) TV reconstruction (background); (f) FDK reconstruction.

Image of FIG. 8.
FIG. 8.

Reconstructions for CatPhan®600 using 339 views. (a) FDK reconstruction; (b) FDK reconstruction without metal (REF image); (c) SeqTV reconstruction (metal), k = 5, sigma = 0.001; (d) binary extraction from (c), all pixels within the extracted contour were considered metal pixels; (e) TV reconstruction; (f) SeqTV reconstruction, sigma = 0.001, k = 5. Both (e) and (f) are fused with metal mask.

Image of FIG. 9.
FIG. 9.

Reconstructions for the anthropomorphic head phantom using 678 views. (a) FDK reconstruction; (b) SeqTV reconstruction (metal), k = 10, sigma = 0.0001; (c) binary extraction from (b); (d) TV reconstruction; (e) SeqTV reconstruction, sigma = 0.001, k = 5. Both (d) and (e) are fused with metal mask.

Tables

Generic image for table
TABLE I.

CNR values of CatPhan®600 for the four ROIs indicated in Fig. 8 .

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/content/aapm/journal/medphys/40/7/10.1118/1.4811129
2013-06-26
2014-04-21
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Sequentially reweighted TV minimization for CT metal artifact reduction
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/40/7/10.1118/1.4811129
10.1118/1.4811129
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