Objective To explore the application value of low concentration contrast agent in the neck 64-slice spiral CT angiography (CTA).Methods From Jan 2014 to Nov 2015, 108 patients undergoing neck CTA in our hospital were randomly divided into three groups of A, B and C, each group of 36 cases, and were administered with 50 ml contrast agent. Among them, group A were given high concentration contrast agent of ultravist (370 mgl/ml, 120 kV), and group B and C were given low concentration contrast agent of ioversol or iohexol (320 mgl/ml vs 300 mgl/ml, 100 kV), respectively. Their original and reconstruction images were comprehensively analyzed.Results All subjects were examined successfully, and their aorta, cephalic artery, base artery and lingual artery were displayed clearly, with arterial contrast medium at higher levels. The CT values of group A were (338.40±78.80) HU at aorta, (392.85±74.03) HU at cephalic artery, (311.77±55.11) HU at base artery and (320.05±54.32) HU at lingual artery. The CT values of group B at the aorta, cephalic artery, base artery and lingual artery were (297.15±67.59) HU, (363.40±71.93) HU, (280.25±43.46) HU and (292.12±46.33) HU, respectively. The CT values of group C were (280.19±66.77) HU, (351.64±75.38) HU, (277.41±45.22) HU and (287.35±49.35) HU, respectively. Although the CT values in the A group were slightly higher than those in the B and C group, but there wasn't statistically significant difference among them (P>0.05). The scores of reconstruction image quality in the three groups were (4.53±0.38), (4.41±0.34) and (4.42±0.29), respectively, and also no significant difference was found (P>0.05).Conclusion The application of neck 64-slice spiral CTA with low concentration contrast agent could obtain better image quality meeting clinical needs. |