低管电压联合低浓度造影剂在肺动脉成像中的可行性

发布时间：2018-06-04 02:27

本文选题：多层螺旋CT + 肺动脉成像　；参考：《中国老年学杂志》2017年14期

【摘要】：目的探讨不同管电压和不同浓度造影剂在CT肺动脉成像(c TPA)的效果及低管电压联合低浓度造影剂在CTPA扫描中的可行性。方法 68例临床怀疑肺栓塞(PE)的患者(体重80 kg)随机分为两组,每组34例。观察组为低剂量组,管电压80 k V,非离子型造影剂碘海醇300 mg/ml,60 ml;对照组为常规组,管电压120 k V,非离子型造影剂碘海醇370 mg/ml,60 ml。测量肺动脉干及各亚段肺动脉CT值,计算平均CT值。以胸骨前空气CT值的标准差代表图像噪声,记录CT实际容积剂量指数(CTDIvol)、剂量长度乘积(DLP)、并计算有效剂量(ED)。计算信噪比(SNR)、对比噪声比(CNR)和有效辐射剂量(m Sv),对两组图像质量进行评分。结果两组图像评分、信噪比、对比噪声比无统计学差异(P0.05)。观察组CTDIvol、DLP、ED分别为(6.86±0.89)m Gy,(219.05±1.88)m Gy×cm,(3.06±0.54)m Sv;对照组CTDIvol、DLP、ED分别为(11.34±1.58)m Gy,362.76±2.38)m Gy×cm,(5.07±1.12)m Sv。观察组有效辐射剂量比对照组明显降低40%。对比剂碘摄入量减少19%。结论利用低管电压和低浓度造影剂在CT肺动脉成像是可行的,可以在保证图像质量的情况下,减少患者的辐射剂量和对比剂碘摄入量。
[Abstract]:Objective to investigate the effect of different tube voltage and different concentration of contrast media in CT pulmonary artery imaging (CT) and the feasibility of low tube voltage combined with low concentration contrast agent in CTPA scanning. Methods 68 patients with suspected PE (body weight 80 kg) were randomly divided into two groups (34 cases in each group). In the observation group, the tube voltage was 80 kV and the Nonionic contrast agent was 300 mg / ml ~ 60 ml, while the control group was a control group with a tube voltage of 120 kV and a non-ionic contrast medium of 370 mg / ml ~ (60 ml). The CT values of pulmonary trunk and subsegmental pulmonary arteries were measured and the mean CT values were calculated. The image noise was represented by the standard deviation of the CT value of presternal air. The CT actual volume dose index (CTDIvoll) and the dose length product (DLPU) were recorded and the effective dose (EDV) was calculated. The signal-to-noise ratio (SNR), the noise ratio (CNR) and the effective radiation dose were calculated to evaluate the image quality of the two groups. Results there was no significant difference in image score, signal-to-noise ratio and contrast noise ratio between the two groups (P 0.05). In the observation group, the Ed of CTDIvoll DLPnC was 6.86 卤0.89mGy, 219.05 卤1.88mGy 脳 cm ~ (-1) mGy, 3.06 卤0.54m Sv.The control group's CTDIvoll DLPnED was 11.34 卤1.58mGy ~ 362.76 卤2.38mGy 脳 cm ~ (-1) mGy 5.07 卤1.12mSv, respectively. The effective radiation dose in the observation group was significantly lower than that in the control group by 40%. The iodine intake of contrast agent was reduced by 19%. Conclusion it is feasible to use low tube voltage and low concentration contrast media in CT pulmonary artery imaging, which can reduce the dose of radiation and iodine intake of contrast agent in patients with pulmonary artery.
【作者单位】：河北医科大学第四医院CT/MRI;
【基金】：河北省2015年度医学科学重点研究课题(No.20150334)
【分类号】：R563.5;R816.41

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