低管电压结合低浓度造影剂对头颈CTA影像学图像质量的影响

Effect of Low Voltage and Low Contrast Agent Concentration on Imaging Quality of Head and Neck CTA

【目的】探讨低管电压结合低浓度造影剂对头颈CT血管造影成像(CTA)检查影像学质量的影响。【方法】选取本院收治的212例行头颈CTA检查的患者的临床资料,根据随机数表法将其分为A组、B组、C组和D组,各53例。A组患者给予常规管电压(120kV)、管电流(150mAs)和造影剂浓度(含碘350mg/mL),B组患者给予管电压(120kV)、管电流(150mAs)和造影剂浓度(含碘320mg/mL),C组患者给予管电压(100kV)、管电流(150mAs)和造影剂浓度(含碘350mg/mL),D组患者给予管电压(100kV)、管电流(150mAs)和造影剂浓度(含碘320mg/mL)。比较四组患者的图像质量评分、动脉节段CT值、信噪比和辐射剂量。【结果】A组、B组、C组、D组患者图像质量评分比较,差异无统计学意义(Z=1.746,P=0.077>0.05)。四组主动脉弓(AOAR)、基底动脉(BA)、左侧颈总动脉(CCA)、右侧CCA、左侧颈内动脉(ICA)、右侧ICA的CT值比较,差异均有统计学意义(P<0.05);D组患者各动脉节段CT值均高于A组、B组,低于C组患者,差异具有统计学意义(P<0.05)。A组、D组患者信噪比均高于B组、C组,B组、D组患者碘摄入量均低于A组、C组,C组、D组有效剂量均低于A组、B组,差异具有统计学意义(P<0.05)。【结论】头颈CTA检查的患者采用低管电压结合低造影剂浓度能够有效降低辐射剂量和碘摄入量,且能够确保较好的图像质量,满足临床诊断需要。

[Objective] To investigate the effect of low tube voltage combined with low concentration contrast agent on the imaging quality of head and neck CT angiography(CTA).[Methods]The clinical data of 212 patients with head and neck CTA in our hospital were selected and divided into group A,group B,group C and group D according to random number table method,53 cases in each group.Patients in the group A were given conventional tube voltage(120kV),tube current(150 mAs)and contrast agent concentration(350 mg/ml of iodine).Patients in the group B were given tube voltage(120 kV),tube current(150 mAs)and contrast agentconcentration(320 mg/ml of iodine).Patients in the group C were given tube voltage(100 kV),tube current(150mAs)and contrast agent concentration(350 mg/ml of iodine).Patients in the group D were given tube voltage(100kV),tube current(150 mAs)and contrast agent concentration(350 mg/ml of iodine).Tube current(150 mAs)and contrast medium concentration(320 mg/ml iodine).The image quality score,CT value of arterial segment,signal-to-noise ratio and radiation dose were compared among the four groups.[Results]There was no significant difference in image quality scores between group A,group B,group C and group D(Z=1.746,P=0.077>0.05).The CT values of aortic arch(AOAR),basilar artery(BA),left common carotid artery(CCA),right CCA,left internal carotid artery(ICA)and right ICA in the four groups were sig-nificantly different(P<0.05).The CT values of each artery segment in the group D were higher than those in the group A and the group B,lower than those the in group C(P<0.05).The signal-to-noise ratio of the group A and the group D was higher than that of the group B and the group C.The iodine intake of the group Band the group D was lower than that of the group A and the group C.The effective dose of the group Cand the group D was lower than that of the group A and the group B.The difference was statistically significant(P<0.05).[Conclusion]Low tube voltage combined with low contrast agent concentration can effectively reduce radiation dose and iodine intake in patients undergoing head and neck CTA examination,and can ensure better image quality and meet the needs of clinical diagnosis.