Measurement of the detective quantum efficiency (DQE) of digital X-ray detectors according to the novel standard IEC 62220-1.
A mobile measurement facility which complies with IEC 62220-1 has been set up to determine the detective quantum efficiency (DQE) of digital X-ray detector systems. Exemplary measurements were performed for two similar CR detector systems, a CsI-based indirect detector and an Se-based direct detector. The standardised radiation quality RQA 5 was applied for measurement and for three of these systems RQA 9 was also applied. A pronounced dependence of DQE on radiation quality was observed for the direct detector, where the DQEs for RQA 5 and RQA 9 differ by a factor of approximately 2. The uncertainty (95% confidence interval) associated with the measured DQE values is within 0.01 and 0.04 depending on, for example, the spatial frequency. Thus, it has been demonstrated that the DQE can be measured accurately and reliably with the accuracy required by the international standard IEC 62220-1. It is now possible to objectively measure and compare DQE values of digital X-ray detector systems.
Illers
Hartmut
H
Physikalisch-Technische Bundesanstalt, Bundesallee 100, D-38116 Braunschweig, Germany. hartmut.illers@gst.de
Buhr
Egbert
E
Hoeschen
Christoph
C
D002138:Calibration; D002586:Cesium / Q000737:chemistry; D003952:Diagnostic Imaging / Q000295:instrumentation / Q000379:methods* / Q000592:standards; D004307:Dose-Response Relationship, Radiation; D006801:Humans; D007454:Iodides / Q000737:chemistry; D008962:Models, Theoretical; D011856:Radiographic Image Enhancement / Q000295:instrumentation; D011857:Radiographic Image Interpretation, Computer-Assisted / Q000295:instrumentation*; D011874:Radiometry; D012643:Selenium / Q000737:chemistry; D012984:Software; D014963:X-Ray Intensifying Screens; D014965:X-Rays
D007454:Iodides; D002586:Cesium; D012643:Selenium; C040050:cesium iodide