SU-D-218-04: Evaluation of the Performance of the Solid State X-Ray Image Intensifier (SSXII) Using Generalized Metrics

Medical Physics
S GuptaS Rudin

Abstract

To evaluate the performance of the Solid State X-ray Image Intensifier (SSXII) using generalized linear-system metrics and to study the effect of different scatter fractions, object magnifications, and focal spots onits performance. The SSXII is a high-resolution and high- sensitivity region-of-interest x-ray imaging detector that provides real-timeimaging with low instrumentation noise. To evaluate the total system performance for a clinical environment, we used generalized metrics that include the effects of scattered radiation, finite focal-spot size, and geometric unsharpness. For comparison, a commercial standard flat-panel detector (FPD) was used. The focal-spot MTF was obtained by taking theFourier Transform of the point-spread function of x-ray pin-hole images. The detector MTF was measured using the standard edge method. The scatter MTF was simulated with a theoretical model. We have calculated the GMTF and GDQE for the SSXII and FPD. Three focal-spots (small, medium, and large), different object magnifications and scatter fractions were used for the GMTF and GDQE comparison. The GMTF andthe GDQE were shown to be degraded significantly from that of the detectoralone at the higher spatial frequencies because of blur due...Continue Reading

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