Photon counting CT: Effects of dynamic beam attenuator on image quality

Conclusion: The DBA fabricated from low Z (such as soft tissue) and K-edge (such as Ho) materials can address the count rate problem of PCCT and provide minimal image artifacts and quantification errors. The DBA fabricated from high Z material with suboptimal K-edge location (such as Fe) can results in major beam hardening artifacts, photon starvation noise, and quantification errors.