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Analysis of the kinestatic charge detection system as a high detective quantum efficiency electronic portal imaging device
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10.1118/1.2241991
/content/aapm/journal/medphys/33/9/10.1118/1.2241991
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/33/9/10.1118/1.2241991
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

(a) The functional schematic of the KCD chamber (not to scale) indicates the essential components. The beam direction is perpendicular to the plane of the figure. (b) The working principle of the KCD is shown, with staggered positions of the chamber in time and black dots indicating a charge cloud formed in response to a detected event. The dots/charges drift downward (anode-grid) as the chamber scans upward. With increasing time, more charge clouds are formed along the original line of radiation since scan speed under kinestasis.

Image of FIG. 2.
FIG. 2.

The high-pressure gas chamber for the prototype KCD is shown in (a) the top view and (b) the transverse sectional side view. All dimensions are in cm.

Image of FIG. 3.
FIG. 3.

The MTF curves for the prototype KCD are shown. The measurement along the scan direction is displayed to , which represents the Nyquist limit along that dimension. The error bars indicate one standard error of mean.

Image of FIG. 4.
FIG. 4.

The NPS curves for the prototype KCD are shown. The measurement along the scan direction is limited to , which represents the Nyquist limit along that dimension. The error bars indicate one standard error of mean. For display purposes, both the measured and Monte Carlo simulated NPS values were normalized to unity. The measured value of NPS(0) before normalization was (measured for a spectrum, SDD, dose at detector surface).

Image of FIG. 5.
FIG. 5.

The DQE curves for the prototype KCD are shown. The measurement along the scan direction is shown only to , which represents the Nyquist limit along that dimension. The error bars indicate one standard error of mean.

Image of FIG. 6.
FIG. 6.

(a) The nonlinearity in the relationship is shown above for the KCD detector with krypton gas at . is the anode voltage of the KCD detector, and is collector channel or imaging signal voltage during irradiation. (b) The nonlinearity in the relationship of (a) is expressed as a linear function using the indicated intuitive domain transformation. The linear intercept is calculated by linear regression to find the expected signal in the absence of recombination.

Image of FIG. 7.
FIG. 7.

An adult chest phantom imaged with (a) Siemens BEAMVIEW VEPID , (b) Elekta iViewGT flat-panel , (c) Agfa Cronex (conventional) film cassette , (d) Kodak EC-L film cassette , and (e) SFOV prototype KCD . The KCD imaging dose was measured at the imaging plane under CPE, while the dose for the other portal imaging systems was estimated using an inverse square correction for the measured SDD.

Image of FIG. 8.
FIG. 8.

The MTF as a function of chamber thickness was evaluated using Monte Carlo simulations. The MTF values at spatial frequencies of 0.25, 0.5, and are shown for a thickness range of up to . The QE for each thickness is also indicated.

Image of FIG. 9.
FIG. 9.

(a) The MTF for the prototype KCD is compared with the MTF measured for a clinical Siemens BEAMVIEW system (measured using a standard slit technique), and those reported in literature for a Cu plate-film combination, and 15 and 21 EPID systems. (b) The DQE for the prototype KCD is compared with the DQE measured for a clinical Siemens BEAMVIEW system, and those reported in literature for a Cu plate-film combination, and 15 and 21 EPID systems.

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/content/aapm/journal/medphys/33/9/10.1118/1.2241991
2006-09-01
2014-04-23
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Analysis of the kinestatic charge detection system as a high detective quantum efficiency electronic portal imaging device
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/33/9/10.1118/1.2241991
10.1118/1.2241991
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