Automatic spectral imaging protocol selection combined with iterative reconstruction can enhance image quality and decrease radiation and contrast dosage in abdominal CT angiography
Purpose：To investigate the effect of automatic spectral imaging protocol selection (ASIS) and adaptive statistical iterative reconstruction (IR) technology in reducing radiation and contrast dosage.
Methods: Sixty-four patients were randomly divided into two groups for abdominal computed tomography (CT): the experiment group with ASIS plus 30%-50% IR and the control with 120kVp voltage.
Results: The CT dose index volume decreased by 23.68% and 23.57% and the dose length product dropped by 25.59% and 18.45% in the arterial and portal venous phases, respectively, in the experiment than control group. The contrast dose was reduced by 16.86% in the experiment group. In the 70keV+30% IR group, the noise of liver, pancreas and sacrospinal muscle were significantly (P<0.05) lower in both phases than the control group, and the score was higher than in the control group (P<0.05). In the 55keV+ 50% IR group, the arterial contrast-to-noise ratio and scores were significantly (P<0.05) higher in the arterial phase but the sacrospinal muscle noise was significantly (P<0.05) lower than in the control group.
Conclusion: The ASIS technique plus 30%-50% IR can enhance image quality of the abdominal structures while decreasing the radiation and contrast dosage compared with the conventional scan mode.
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