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Scatter rejection and low-contrast performance of a slot-scan digital chest radiography system with electronic aft-collimation: A chest phantom study
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10.1118/1.2921132
/content/aapm/journal/medphys/35/6/10.1118/1.2921132
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/35/6/10.1118/1.2921132
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Figures

Image of FIG. 1.
FIG. 1.

Conventional line-by-line readout following x-ray exposure (a, b) for a commercial flat-panel digital radiography system. Alternate line erasure and readout (ALER) technique (c, d) for slot-scan digital radiography implemented with a flat-panel detector that alternatively reset the leading edge line and read out the trailing edge line in synchronization with the scanning fan-beam x-ray. (Reprinted from: X. Liu, C. C. Shaw, M. C. Altunbas, and T-P. Wang, “An Alternate Line Erasure and Readout (ALER) Method for Implementing Slot-Scan Imaging Technique with a Flat-Panel Detector–Initial Experiences,” IEEE Trans. Med. Imaging 25, 496–502. © 2006 IEEE, with permission from IEEE).

Image of FIG. 2.
FIG. 2.

Image signal intensity plotted as a function of exposure (mAs) for images acquired with and without anti-scatter grid. Exposures made at with a aluminum block placed at the x-ray tube output to simulate the x-ray spectrum and attenuation of a patient.

Image of FIG. 3.
FIG. 3.

Normalized signal intensity plotted as a function of beam aperture diameter for a number of circular apertures with a linear fit.

Image of FIG. 4.
FIG. 4.

(a) Experimental setup for primary, scatter, and scatter-to-primary ratio (SPR) measurement (a stationary anti-scatter grid was inserted at the detector front when the measurements were made for both full-field and slot-scan imaging with grid); (b) Radiograph of an anthropomorphic chest phantom with associated beam apertures for separating scatter component from primary signal at various locations. Highlighted areas indicate the regions used for the assessment of measurement in the lungs (1), mediastinum (2), retrocardia (3), and subdiaphragm (4).

Image of FIG. 5.
FIG. 5.

(a) Scatter-to-primary ratio (SPR) and (b) SPR reduction ratio (differences between the full-field no grid SPRs and the reduced SPRs divided by the former) measured in the lungs, mediastinum, retrocardia, and subdiaphragm for comparison for anti-scatter grid and slot-scan methods with same beam quality and quantity.

Image of FIG. 6.
FIG. 6.

(a) Contrast ratio (CR) and (b) CR improvement factor (the ratio of the improved CRs to those for full-field, no grid imaging) measured in the lungs, mediastinum, retrocardia, and subdiaphragm for the full-field (FF) and slot-scan (SS) digital radiography systems with same beam quality and quantity.

Image of FIG. 7.
FIG. 7.

(a) CNR and (b) CNR improvement factor (the ratio of the improved CNRs to those for full-field, no grid imaging) measured in the lungs, mediastinum, retrocardia, and subdiaphragm for the full-field (FF) and slot-scan (SS) digital radiography systems with same beam quality and quantity.

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/content/aapm/journal/medphys/35/6/10.1118/1.2921132
2008-05-20
2014-04-20
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Scatter rejection and low-contrast performance of a slot-scan digital chest radiography system with electronic aft-collimation: A chest phantom study
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/35/6/10.1118/1.2921132
10.1118/1.2921132
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