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CT energy weighting in the presence of scatter and limited energy resolution
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10.1118/1.3301615
/content/aapm/journal/medphys/37/3/10.1118/1.3301615
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/37/3/10.1118/1.3301615

Figures

Image of FIG. 1.
FIG. 1.

Detector response functions modeled by Schlomka et al. (Ref. 13) for incident photons of 30, 45, 60, and 75 keV.

Image of FIG. 2.
FIG. 2.

The true linear attenuation coefficient of water compared to the attenuation coefficient estimated in the presence of spectrum tailing for varying material thicknesses.

Image of FIG. 3.
FIG. 3.

The ratio of the estimated to true attenuation coefficients of water and iodine for a 20 cm slab thickness.

Image of FIG. 4.
FIG. 4.

Central horizontal profile through images reconstructed from the five energy bins simulated with ideal and spectrum tailing conditions.

Image of FIG. 5.
FIG. 5.

Contrast and noise in energy-bin images simulated with ideal and spectrum tailing conditions.

Image of FIG. 6.
FIG. 6.

Comparison of image-based weights calculated for ideal conditions (IB-ideal), spectrum tailing conditions using Eq. (2) (IB-spectrum tailing), and weights optimized for spectrum tailing by measuring both the contrast and noise in the energy-bin images (-spectrum tailing).

Image of FIG. 7.
FIG. 7.

Comparison of profiles of images reconstructed with photon-counting, projection-based, and image-based weights for ideal and spectrum tailing conditions.

Image of FIG. 8.
FIG. 8.

CNR in images reconstructed with integrating, counting, optimal image, and projection-based weighting for a range of scatter conditions.

Image of FIG. 9.
FIG. 9.

CNR in images reconstructed with integrating, counting, and image-based weighting for a range of scatter conditions after ideal deterministic scatter correction.

Image of FIG. 10.
FIG. 10.

Images reconstructed with image-based weighting under (a) ideal conditions, (b) spectrum tailing, (c) scatter (8.9°), and (d) combined scatter and spectrum tailing effects. All images are windowed to display −250 to 250 HU.

Image of FIG. 11.
FIG. 11.

Comparison of profiles of images reconstructed with photon-counting, projection-based, and image-based weights for ideal, scatter, and combined scatter/spectrum tailing conditions.

Tables

Generic image for table
TABLE I.

Simulated system specifications.

Generic image for table
TABLE II.

Applied energy weighting methods.

Generic image for table
TABLE III.

Reconstructed CNR.

Generic image for table
TABLE IV.

Percent cupping artifact (Eq. (17)).

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/content/aapm/journal/medphys/37/3/10.1118/1.3301615
2010-02-09
2014-04-20
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: CT energy weighting in the presence of scatter and limited energy resolution
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/37/3/10.1118/1.3301615
10.1118/1.3301615
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