Preliminary performance measurements from a second generation diffraction enhanced imaging system
2012
Purpose: The goal of this study was to begin quantifying the performance of a second generation diffraction
enhanced imaging (DEI) system designed to reduce imaging time from our first generation system.
Background: DEI, a phase contrast x-ray imaging modality, generates images with enhanced soft tissue contrast at a
lower dose than conventional radiography. Our group has previously reported on an x-ray tube-based DEI system,
but a substantial gap remained between the imaging time of that system and that of a clinical DEI system.
Method: A high power, rotating anode x-ray tube was integrated into this second generation DEI system along with
an image intensifier to improve photon counting efficiency. Images of phantoms were acquired using a tube power
of 10 kW (125 kVp, 80 mA) at the silicon [333] reflection with the analyzer crystal at its half-reflectivity point.
Results: Our preliminary results show comparable image contrast to the first generation DEI system. Imaging time
was reduced by a factor four and x-ray-on time was reduced by a factor of sixty from the initial prototype system.
Conclusions: These early results from our second generation diffraction enhanced imaging system show significant
reduction in imaging time with preservation of DEI contrast.
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