DETERMINATION OF THE EFFECTIVE ATOMIC NUMBER OF MATERIALS BY POLYNOMIAL CORRECTION IN THE IMAGE DOMAIN OF SPECTRAL X-RAY CT WITH A PHOTON-COUNTING DETECTOR

This paper addresses the correction of multi-energy linear attenuation coefficients (LACs) measured with a CdTe-based photon-counting detector (PCD). The correction is a polynomial method applied in the reconstructed image domain. The corrected LACs are then used to determine the effective atomic number () of materials. Without correction, the mean error was 25.5%. After polynomial correction it decreased to 3.6%, roughly a sevenfold improvement. The lower limit of the working energy range dropped from 72.9 keV to 27.7 keV.

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