Characterization of the VARIANr PaxScan 2020+ flat panel detector for quantitative X-ray imaging

FEDERICO GESER; DAVID CHACON; RODOLFO FIGUEROA; FRANCISCO MALANO; MAURICIO SANTIBAÑEZ; MAURO VALENTE

X-RAY SPECTROMETRY

JOHN WILEY & SONS LTD

Lugar: LOndres; Año: 2016

0049-8246

In this work, the response of the VARIANr PaxScan 2020+ flat panel detector was characterized in terms of spatial resolutionand uniformity across the detection area along with detection efficiency for photon beams from conventional X-ray tubes. Thisinformation is not commonly provided by the manufacturer. The characterization of spatial resolution, response uniformityand the detection efficiency of theVARIANr PaxScan 2020+ are a crucial key for improving imaging procedures with diagnosticpurposes, mainly when quantification by image processing is required. According to the obtained results, the VARIANrPaxScan 2020+ detector has, on average, a spatial uniformity, considered as detector response corresponding to differentpositions for a fixed excitation beam, of 77% measured across the whole detection area 19.819.8 cm2; whereas the minimumsize measurable is (357 ˙ 14) m. A rigorous method is shown to characterize the quantum efficiency, obtaining a suitabledescription and parameterization of the quantum efficiency as a function of energy. The incorporation of spatial uniformityand quantum efficiency for the convolution of the recorded images is in fact mandatory for the extraction of accuratequantitative information of scanned samples