Résumé
Objective To discuss the influence to gemstone spectral imagine of low-mA combined with ASIR on simulation phan-tom.Methods 20 simulation phantom-scannings were obtained with GSI-48(260 mA)and 50%ASIR,GSI viewer was used to obtain the optimal CNR monochromatic images,which was as the experimental group;Another 20 simulation phantom-scannings were ob-tained with 120 kVp,3D-auto-mA(NI=10),FBP,which was as the control group.The SD,CNR,SNR,FOM,CTDIVOL and imagine quality score of the control group were compared with that of the experimental group.Results The SD,CNR,SNR,FOM,CTDIVOL and imagine quality score were (5.64±0.49),(14.58 ±1.14),(13.87 ±1.1 9),(29.89 ±5.35),(6.48 ±0),(4.1 1 ±0.59)for the experimental group and (12.62±1.41),(6.70±0.65),(6.87±0.66),(6.62 ±1.32),(6.85 ±0.07),(3.74±0.59)for the control group respectively (P <0.05).Conclusion Gemstone spectral imagine of low-mA combined with ASIR can improve image quality at lower radiation dose.