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Radiation dose reduction using a CdZnTe-based computed tomography system: Comparison to flat-panel detectors
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10.1118/1.3312435
/content/aapm/journal/medphys/37/3/10.1118/1.3312435
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/37/3/10.1118/1.3312435

Figures

Image of FIG. 1.
FIG. 1.

Schematic of the CZT CT setup.

Image of FIG. 2.
FIG. 2.

Schematic of the 2.5 cm cylindrical PMMA phantom. Embedded in the center are different concentrations of iodine and calcium.

Image of FIG. 3.
FIG. 3.

Tube output measurements and the corresponding spectral model (a). The total aluminum filtrations were 2.6 and 2.7 mm for the tube and the model, respectively. The 80 kV spectrum with divisions of energy bin is also shown (b).

Image of FIG. 4.
FIG. 4.

The linear attenuation coefficient of iodine, hydroxyapatite, PMMA, and 50/50 breast tissue. Also shown are the five energy bins used for CZT imaging.

Image of FIG. 5.
FIG. 5.

Weight factors for the five energy bins are shown for HA (a) and Iodine (b). Projection-based and image-based values indicate their similarity in trend.

Image of FIG. 6.
FIG. 6.

The reconstructed slice for the simulation experiments of the 10 cm breast (a) and the 2 cm PMMA cylinder (b). Iodine and HA contrast elements are visible. , .

Image of FIG. 7.
FIG. 7.

Reconstructed slice of the phantom for bin 1 (a), bin 2 (b), bin 3 (c), bin 4 (d), and bin 5 (e). , .

Image of FIG. 8.
FIG. 8.

Reconstructed slice of the phantom for different detector types: Photon counting (a), projection-based weighting HA (b), image-based weighting HA (c), and charge integrating (d). , .

Image of FIG. 9.
FIG. 9.

Contrast-to-noise ratio vs energy bin for HA (300 mg/ml) and iodine (8 mg/ml).

Image of FIG. 10.
FIG. 10.

CNR as a function of air kerma of the experimental 2.5 cm PMMA cylinder for 300 mg/ml HA (a) and 8 mg/ml iodine (b).

Image of FIG. 11.
FIG. 11.

CNR improvement as a function of the energy weighting methods for HA (a) and Iodine (b). Values from both simulations and experiments are shown. integrating, counting, -based weighting, -based weighting.

Image of FIG. 12.
FIG. 12.

Exposure reduction, compared to CNR value of the charge integrating/flat-panel detector at 2.18 mGy, as a function of the energy weighting methods for HA (a) and iodine (b). Values from both simulations and experiments are shown. integrating, counting, -based weighting, -based weighting.

Image of FIG. 13.
FIG. 13.

Beam hardening quantification shows amount of change in for simulations (a) and measurements (b).

Tables

Generic image for table
TABLE I.

Energy range for bins 1–5.

Generic image for table
TABLE II.

Contrast-to-noise improvements for images acquired at 2.18 mGy.

Generic image for table
TABLE III.

Exposure reductions (in percentage) when setting the CNR of the flat-panel image acquired at 2.18 mGy as the reference.

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/content/aapm/journal/medphys/37/3/10.1118/1.3312435
2010-02-22
2014-04-19
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Radiation dose reduction using a CdZnTe-based computed tomography system: Comparison to flat-panel detectors
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/37/3/10.1118/1.3312435
10.1118/1.3312435
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