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Comparison of scatter rejection and low-contrast performance of scan equalization digital radiography (SEDR), slot-scan digital radiography, and full-field digital radiography systems for chest phantom imaging
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10.1118/1.3519903
/content/aapm/journal/medphys/38/1/10.1118/1.3519903
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/38/1/10.1118/1.3519903
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Bench top SEDR system and experimental setup. The system is built based on an a-Se flat-panel detector and slot-scanning geometry.

Image of FIG. 2.
FIG. 2.

(a) X-ray beam width modulation assembly used for SEDR imaging and (b) cross-sectional (coronal) view of the beam width modulation assembly.

Image of FIG. 3.
FIG. 3.

Exposure equalization pattern computed from a low dose prescan chest phantom image. The scale shows the required exposure ratio to the lowest exposure.

Image of FIG. 4.
FIG. 4.

Synthetic digital image of an anthropomorphic chest phantom and the associated locations of the beam apertures where the measurements were made. The results were averaged and compared for four regions (highlighted): (1) lungs, (2) mediastinum, (3) retrocardium, and (4) subdiaphragm.

Image of FIG. 5.
FIG. 5.

(a) SPRs measured in the lungs, mediastinum, retrocardium, and subdiaphragm for the full-field without/with grid, slot-scan, and SEDR methods with the same beam quality and entrance exposure. (b) SPRRRs measured in the lungs, mediastinum, retrocardium, and subdiaphragm for the full-field with grid, slot-scan, and SEDR methods with the same beam quality and entrance exposure.

Image of FIG. 6.
FIG. 6.

(a) CRs measured in the lungs, mediastinum, retrocardium, and subdiaphragm for the full-field without/with grid, slot-scan, and SEDR methods with the same beam quality and entrance exposure. (b) CR improvement factors (over nongrid full-field imaging) measured in the lungs, mediastinum, retrocardium, and subdiaphragm for the full-field with grid, slot-scan, and SEDR methods with the same beam quality and entrance exposure.

Image of FIG. 7.
FIG. 7.

(a) CNRs measured in the lungs, mediastinum, retrocardium, and subdiaphragm for the full-field without/with grid, slot-scan, and SEDR methods with the same beam quality and entrance exposure. (b) CNR improvement factors (over nongrid full-field imaging) measured in the lungs, mediastinum, retrocardium, and subdiaphragm for the full-field with grid, slot-scan, and SEDR methods with the same beam quality and entrance exposure.

Image of FIG. 8.
FIG. 8.

(a) CNRs and the (b) CNR improvement factors (over full-field imaging with grid) measured in the lungs, mediastinum, retrocardium, and subdiaphragm for the SEDR images with effective entrance exposures of 32%, 50%, 70%, and 100% to that of the full-field imaging technique.

Image of FIG. 9.
FIG. 9.

(a) Chest phantom image with low-contrast objects (Al beads); the zoomed-in ROI in retrocardium imaged with different techniques: (b) Nongrid full-field; (c) full-field with anti-scatter grid; (d) slot-scanning; and (e) SEDR.

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/content/aapm/journal/medphys/38/1/10.1118/1.3519903
2010-12-14
2014-04-21
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Comparison of scatter rejection and low-contrast performance of scan equalization digital radiography (SEDR), slot-scan digital radiography, and full-field digital radiography systems for chest phantom imaging
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/38/1/10.1118/1.3519903
10.1118/1.3519903
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