Optimization of a calibration phantom for quantitative radiography

Objective Dual energy radiography (DER) makes it possible to obtain separate images for soft-tissue and bony structures (tissue maps) based on the acquisition of two radiographs at different source peak-kilovoltage values. Current DER studies are weighted subtraction method, which requires either manual tuning or use precomputed tables, decomposition methods, make a calibration model bone components. In this study, we examined in depth optimum method perform calibration. Methods We used simulations optimize protocol evaluated effect material size phantom composed wedges its positioning system. Evaluated materials were water, PMMA A-150 as equivalent, Teflon, B-100 aluminum with sizes from 5 30 cm. Each combination was compared an ideal soft tissue bone. Our simulation results enabled us propose four designs that tested NOVA FA X-ray system realistic thorax phantom. Results Calibration very simple inexpensive no strict requirements placement appropriate separation spine (a common focus densitometry studies) identification nodules small 6 mm, have been reported low rate detection radiography. Conclusion The proposed is completely automatic, avoiding need radiology technician expert knowledge protocol, case exams. provides real mass thickness values, enabling quantitative planar instead relative comparisons.