双低剂量在头颈部CTA滤过反投影重组法中的应用

发布时间：2018-11-25 21:32

【摘要】：目的探讨双低剂量在头颈部计算机体层血管成像(CTA)滤过反投影重组法中的应用。方法将拟行头颈部CTA检查的54例患者随机分两组,每组27例。A组:管电压100 kV p,对比剂为碘克沙醇(270 mgI/ml);B组:管电压120 kV p,对比剂为碘海醇(350 mgI/ml)。两组其它扫描参数相同。记录两组的CT容积剂量指数(CTDI)、扫描范围及剂量长度乘积(DLP),测量受检者多处头颈部动脉CT值均值,计算有效辐射剂量(ED)、身体质量指数(BMI)和平均碘摄入量(mgI/kg),由两名医师采用4分制对两组图像质量进行主、客观评价并采用统计学方法检验其差异性。结果 A组的辐射计量(1.78±0.20)mG y低于B组(2.44±0.24)mG y;A组患者接受碘剂量(13.5 g)低于B组(17.5 g),其差异均有统计学意义(P0.002)。两组头颈部大血管CT值差异无统计学意义(P0.05)。结论低管电压(100 kV p)条件下,使用低浓度对比剂(270 mgI/ml)双低剂量在头颈部CTA检查中应用于滤过反投影重组法,能够保证图像诊断要求的同时明显降低了辐射剂量及对比剂的摄入量。
[Abstract]:Objective to investigate the application of double low dose (CTA) filtration reverse projection recombination in computed tomography of head and neck. Methods Fifty-four patients with head and neck CTA were randomly divided into two groups, 27 patients in each group. Group A: tube voltage 100 kV p, contrast agent: iodoxacin (270 mgI/ml); B: tube voltage: 120 kV p, contrast agent: iodohalol (350 mgI/ml). The other scan parameters of the two groups were the same. The CT volumetric dose index (CTDI),) scan range and dose length product (DLP),) were recorded to measure the mean CT value of multiple head and neck arteries in both groups, and to calculate the effective radiation dose (ED),). Body mass index (BMI) and average iodine intake (mgI/kg) were measured by two physicians using a 4-point system to evaluate the image quality of the two groups objectively and statistically. Results the dose of iodine in group A (1.78 卤0.20) mG y) was lower than that in group B (2.44 卤0.24) mG YA (13.5g) lower than that in group B (17.5 g),) (P 0.002). There was no significant difference in CT between the two groups (P0.05). Conclusion under the condition of low tube voltage (100 kV p), low concentration contrast agent (270 mgI/ml) and double low dose were used in head and neck CTA examination for filtration backprojection recombination. It can meet the requirement of image diagnosis and reduce the dose of radiation and the intake of contrast agent.
【作者单位】：河西学院附属张掖人民医院影像中心;
【分类号】：R816.1

【参考文献】