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Physical evaluation of a needle photostimulable phosphor based CR mammography system
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10.1118/1.3675403
/content/aapm/journal/medphys/39/2/10.1118/1.3675403
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/39/2/10.1118/1.3675403

Figures

Image of FIG. 1.
FIG. 1.

Detector response curves measured for the four systems.

Image of FIG. 2.
FIG. 2.

Presampling MTF averaged for the left–right (fast scan) and chest wall-nipple (slow scan) directions across the detector.

Image of FIG. 3.
FIG. 3.

Noise (variance) expressed as a fraction of total noise plotted as a function of air kerma at the detector for (a) Agfa HM5.0 needle phosphor (b) Agfa MM3.0R single sided readout powder phosphor (c) Fuji Profect CS dual sided readout powder phosphor (d) Siemens Inspiration a-Se based system.

Image of FIG. 4.
FIG. 4.

NNPS as a function of spatial frequency for the Agfa HM5.0 needle phosphor, Agfa MM3.0R single sided readout powder phosphor, Fuji Profect CS dual sided readout powder phosphor, Siemens Inspiration a-Se based systems measured at (a) ∼10 μGy (b) ∼100 μGy and (c) ∼800 μGy. Figure (d) shows NNPS at 5 mm−1 as a function of air kerma at the detector.

Image of FIG. 5.
FIG. 5.

Sum of normalized quantum and luminescence noise multiplied by number of photons [(NNPS q  + NNPSlumQ] versus spatial frequency as used in the CR plate gain calculation.

Image of FIG. 6.
FIG. 6.

DQE as a function of spatial frequency measured at ∼100 μGy.

Image of FIG. 7.
FIG. 7.

DQE at (a) 1 mm−1 and (b) 5 mm−1 plotted as a function of air kerma at the detector.

Image of FIG. 8.
FIG. 8.

(a) Threshold gold thickness measured using the CDMAM test object. Agfa HM5.0 data acquired at 28 kV Mo/Rh and MGD of 2.26 mGy; Agfa MM3.0R data acquired at 28 kV Mo/Rh and MGD of 3.00 mGy; Fuji Profect CS data acquired at 28 Mo/Rh and MGD of 1.51 mGy; Siemens Inspiration data acquired at 28 kV W/Rh and 1.29 mGy. (b) Threshold contrast calculated using the NPWE model for the a-Se (Siemens Inspiration) and needle CR phosphor (Agfa HM5.0) detectors. Calculations were made for detector entrance air kerma values of 50 μGy [top pair of curves], 100 μGy [centre pair of curves]and 200 μGy [bottom pair of curves].

Image of FIG. 9.
FIG. 9.

(a) Relative SdNR calculated according to the European Guidelines (b) MGD calculated for the four systems at typical AEC settings.

Tables

Generic image for table
TABLE I.

Beam quality and photons mm−2 μGy−1 for the evaluation spectra; measured detector response curve coefficients; detector uniformity error (coefficient of variation).

Generic image for table
TABLE II.

MTF at 5 mm−1 in the left–right and chest wall-nipple directions along with ratio of MTF for chest wall-nipple to left–right results (for CR detectors this corresponds to ratio of MTF in slow scan to fast scan directions).

Generic image for table
TABLE III.

Fractional absorption, NNPSlum·Q and system gain measured at 28 kV, Mo/Rh with 2 mm Al added for the three CR systems.

Generic image for table
TABLE IV.

Peak DQE and DQE at 5 mm−1 at reference air kerma with 2 mm Al added beam filtration.

Generic image for table
TABLE V.

Acquisition factors for CDMAM test object; mean glandular dose for 50 mm PMMA; threshold gold thickness for 0.1 and 0.25 mm diameter discs; approximate MGD to meet the Acceptable image quality level for 0.1 mm discs.

Generic image for table
TABLE VI.

X-ray acquisition factors, SdNR, and contrast for the AEC acquisitions.

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/content/aapm/journal/medphys/39/2/10.1118/1.3675403
2012-01-23
2014-04-25
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Physical evaluation of a needle photostimulable phosphor based CR mammography system
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/39/2/10.1118/1.3675403
10.1118/1.3675403
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