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Segmentation and quantification of materials with energy discriminating computed tomography: A phantom study
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10.1118/1.3525835
/content/aapm/journal/medphys/38/1/10.1118/1.3525835
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/38/1/10.1118/1.3525835

Figures

Image of FIG. 1.
FIG. 1.

Schematic of the CZT system.

Image of FIG. 2.
FIG. 2.

Linear attenuation coefficients of the plastics used in the base material of the phantoms. Adipose (AT) and glandular (GT) tissues are also shown for comparison. , , and .

Image of FIG. 3.
FIG. 3.

Diagrams of the calibration phantoms with (a) hydroxyapatite and (b) iodine contrast elements and measurement phantoms of (c) three and (d) four materials. , , , , and .

Image of FIG. 4.
FIG. 4.

Photon counting CT images of hydroxyapatite calibration (left) and iodine calibration (right) phantoms .

Image of FIG. 5.
FIG. 5.

CT slices of the polymethylmethacrylate three-material phantom for energy bins (a) 1, (b) 2, (c) 3, (d) 4, and (e) 5 .

Image of FIG. 6.
FIG. 6.

Calibration curves for (a) HA and (b) iodine. The slope of the each line indicates the effective mass attenuation coefficients for the corresponding energy bin.

Image of FIG. 7.
FIG. 7.

Material separation was applied to the polymethylmethacrylate three-material phantom. (a) Photon counting image and decomposed images of (b) PMMA (L/W: 600/1000 mg/ml), (c) hydroxyapatite (L/W: 200/600 mg/ml), and (d) iodine (L/W: 10/20 mg/ml) are shown.

Image of FIG. 8.
FIG. 8.

Relationships between the measured and known concentrations of (a) hydroxyapatite and (b) iodine. The identity line is shown is dashed.

Image of FIG. 9.
FIG. 9.

Material separation was performed on the polyethylene three-material phantom. (a) Photon counting image and decomposed images of (b) PMMA (L/W: 600/1000 mg/ml), (c) hydroxyapatite (L/W: 200/600 mg/ml), and (d) iodine (L/W: 10/20 mg/ml) are shown. Base material was calibrated with PMMA.

Image of FIG. 10.
FIG. 10.

Material separation was performed on the polyoxymethylene three-material phantom. (a) Photon counting image and decomposed images of (b) PMMA (L/W: 600/1000 mg/ml), (c) hydroxyapatite (L/W: 200/600 mg/ml), and (d) iodine (L/W: 10/20 mg/ml) are shown. Base material was calibrated with PMMA.

Image of FIG. 11.
FIG. 11.

Material separation was performed on the four-material phantom. (a) Photon counting image and decomposed images of (b) PE (L/W: 600/1000 mg/ml), (c) PMMA (L/W: 600/1000 mg/ml), (d) hydroxyapatite (L/W: 200/600 mg/ml), (e) and iodine (L/W: 10/20 mg/ml) are shown.

Tables

Generic image for table
TABLE I.

Quantification of the hydroxyapatite measured with the three-material phantoms. , , and .

Generic image for table
TABLE II.

Quantification of the iodine measured with the three-material phantoms. , , and .

Generic image for table
TABLE III.

Quantification of the hydroxyapatite and iodine measured with the four-material phantom.

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/content/aapm/journal/medphys/38/1/10.1118/1.3525835
2010-12-20
2014-04-19
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Segmentation and quantification of materials with energy discriminating computed tomography: A phantom study
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/38/1/10.1118/1.3525835
10.1118/1.3525835
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