New Method For The Experimental Determination Of The Detective Quantum Efficiency Of X-Ray Screens

C. E. Dick; J. W. Motz; H. Roehrig

doi:10.1117/12.958897

18 August 1980 New Method For The Experimental Determination Of The Detective Quantum Efficiency Of X-Ray Screens

C. E. Dick, J. W. Motz, H. Roehrig

Proceedings Volume 0233, Application of Optical Instrumentation in Medicine VIII; (1980) https://doi.org/10.1117/12.958897
Event: Application of Optical Instrumentation in Medicine VIII, 1980, Las Vegas, United States

Abstract

We have developed a new experimental method to determine the detective quantum efficiency (DQE) of any given x-ray screen for different x-ray energies. This method employs fast (10 ns) counting and coincidence techniques to directly measure the number, m, of photons emitted from the screen per absorbed x ray, and to determine both the statistical distribution and average value of m. These experimental data have been obtained for a calcium tungstate and a rare earth oxysulfide screen with quasi-monoenergetic x-ray beams in the region from approximately 15 to 70 keV. Examples of the experimental DQE values obtained from these measure-ments for pairs of the two types of screens respectively are 0.86 and 0.75 at an x-ray energy of 18 keV, and 0.20 and 0.41 at an x-ray energy of 69 keV. These results indicate a reversal in the relative capabilities of the screens to transfer image information such that there would be a preference for the calcium tungstate screen at 18 keV and the rare earth oxysulfide screen at 69 keV.

Citation Download Citation

C. E. Dick, J. W. Motz, and H. Roehrig "New Method For The Experimental Determination Of The Detective Quantum Efficiency Of X-Ray Screens", Proc. SPIE 0233, Application of Optical Instrumentation in Medicine VIII, (18 August 1980); https://doi.org/10.1117/12.958897

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