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Use of a line-pair resolution phantom for comprehensive quality assurance of electronic portal imaging devices based on fundamental imaging metrics
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10.1118/1.3099559
/content/aapm/journal/medphys/36/6/10.1118/1.3099559
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/36/6/10.1118/1.3099559
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

A diagnostic quality radiograph of the bar-pattern QA phantom is shown along with specifications of individual line-pair resolutions in lp/mm.

Image of FIG. 2.
FIG. 2.

The image of the bar-pattern QA phantom acquired with the Elekta iViewGT EPID is shown. The corner locations and ROIs indicated in the image are identified automatically by the QA algorithm.

Image of FIG. 3.
FIG. 3.

Simulated loss in spatial resolution as characterized by MTF measurements from the bar-pattern QA phantom images for the Beamview and iViewGT systems are shown. The level of simulated Gaussian blurring is indicated by its fwhm (in pixels).

Image of FIG. 4.
FIG. 4.

NPS measurements for the Beamview and iViewGT systems indicating simulated increase in noise are shown. The increase in noise relative to the open-field noise is specified.

Image of FIG. 5.
FIG. 5.

The DQE for the Beamview and iViewGT systems indicating simulated increase in noise are shown. The increase in noise relative to the open-field noise is specified.

Image of FIG. 6.
FIG. 6.

The effects of the improved camera system for the Beamview EPID and the reduced performance of the iViewGT system over its use since commissioning are highlighted in terms of their (a) MTF and (b) DQE curves, along with previously reported MTF and DQE measurements for a research prototype a-Si EPID with a 6 MV beam (Ref. 29).

Image of FIG. 7.
FIG. 7.

The sensitivity of the MTF in response to Gaussian blurring is shown in comparison to the PIPSpro (sensitivities are indicated in terms of % change). The MTF is represented by the area under its curve ().

Image of FIG. 8.
FIG. 8.

The sensitivity of the NPS in response to additive Gaussian noise is shown in comparison to the PIPSpro Sigma (sensitivities are indicated in terms of % change). The NPS is represented by the area under its curve ().

Image of FIG. 9.
FIG. 9.

The sensitivity of the DQE in response to additive Gaussian noise is shown in comparison to the PIPSpro CNR (sensitivities are indicated in terms of % change). The DQE is represented by the area under its curve ().

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/content/aapm/journal/medphys/36/6/10.1118/1.3099559
2009-05-05
2014-04-23
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Use of a line-pair resolution phantom for comprehensive quality assurance of electronic portal imaging devices based on fundamental imaging metrics
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/36/6/10.1118/1.3099559
10.1118/1.3099559
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