The Study of Optimization for Scanning Speed with Ultra Low Dose Contrast Agent Applied and Low Dose of Radiation in Cranio-cervical CTA for Common Weight Cases
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Abstract
Objective: To study the feasibility of cranio-cervical CTA by dual source CT with low-dose radiation and contrast agent (26~32mL) for common weight (79.4±14.5kg) and BMI (21kg/m22) cases. Methods: 80 cases of cranio-cervical CTA were randomly divided into experimental group (group A) and control group (group B), with 40 cases in each group. The parameters such as trigger threshold, pitch and rotation time of group A were optimized. Then the image quality and the radiation dose produced by Head Angio sequence were compared between the two groups. Results: the objective evaluation indexes of the other segments except the bilateral internal carotid artery in group A were lower than that of group B, the difference between the two groups was statistically significantand (P<0.05). The dosage of contrast agent (29.07±2.05) mL and radiation dose were lower than that of group B,the differences between the two groups were statistically significantand (P<0.05). The subjective evaluation of the contrast agent concentration in the right subclavian vein and the cephalic vein was better than that of group B, the differences between the two groups were statistically significantand (P<0.05). The subjective evaluation of arterial images between the two groups were not statistically significant (P>0.05). Conclusion: Dual source CT can be used for cranio-cervical CTA with low radiation dose and ultra low contrast agent for common weight cases.
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