Detector characterization of a digital mammography system in 2D and 3D acquisition modes
DOI:
https://doi.org/10.29384/rbfm.2023.v17.19849001609Keywords:
radiology, 2D mammography, tomosynthesis, image quality, ; detector characterizationAbstract
The 2D and 3D acquisition modes of the GEHC Senographe Pristina digital mammography system were evaluated through physical figures of merit: the modulation transfer function (MTF), normalized noise power spectrum (NNPS), quantum detection efficiency (DQE) and image system noise analysis through component decomposition. The response functions of the detector were linear for both acquisition modes regardless of the spectrum used by the equipment (26 kV Mo/Mo and 34 kV Rh/Ag), noting that the gain of the detector in 3D mode is greater to compensate the lower detector air kerma (DAK) per projection. The dominance ranges of each type of noise calculated through the noise components are presented. The quantum component was the dominant one in the range of DAK used, being approximately 80% the total variance at 100 µGy. MTF curves were obtained in 2D and 3D modes in the horizontal and vertical directions, with higher average values obtained from MTF50% and MTF 5mm-1 in 3D versus 2D mode. In 3D mode, MTF was obtained at distances 20 mm, 40 mm and 50 mm over the detector. A decrease in MTF has been observed with increasing height. In both modes the radial NNPS was always higher for the 26 kV Mo/Mo spectrum than for the 34 kV Rh/Ag spectrum. The same behavior was observed in DQE and this was explained by the smallest amount of photons/mm2µGy for the Mo/Mo spectrum and the obtained NNPS. The values of DQE 0.5 mm-1 to approximately 100 µGy were always greater than 0.5, with higher DQE for 3D mode. These results have shown good performance of the detector used for clinical purposes.
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