“双低”在肝脏CT增强扫描中的可行性

发布时间：2018-08-15 11:22

【摘要】：目的:探讨降低辐射剂量方法结合运用低浓度对比剂进行肝脏CT动态增强扫描临床应用的可行性。方法:180例受检者首先根据使用碘克沙醇剂量的不同随机分为I组(270 mg I/m L碘克沙醇)和II组(320 mg I/m L碘克沙醇),然后将A(120 k V/300 m A),B(100 k V/400 m A),C(100 k V/300 m A)3组不同的扫描条件随机分布于I组和II组各期(动脉期、静脉期、延时期)的动态增强扫描中;记录、统计并比较各组有效辐射剂量(eff ective radiation dose,ED)、图像CT值及反映图像质量的噪声值(image of noise,NI)、信噪比(signal to noise ratio,SNR)、对比噪声比(contrast to noise ratio,CNR)、整体图像质量(overall image quality,OIQ)。结果:总体样本中C组的ED值比A组在3期动态增强扫描中分别降低约38%,40%,41%,图像质量各值(NI,SNR,CNR,OIQ)两组间差异有统计学意义(P0.05);B组的ED值比A组在3期动态增强扫描中分别降低约18%,20%,20%,而图像质量各值均无明显差异(P0.05)。同扫描条件及时相下I,II两组图像CT值存在明显差异(P0.05)而图像质量各值无明显差异(P0.05);A-II组与B-I,C-I组图像CT值无明显差异(P0.05);所得图像质量各值A-II组与B-I组无明显差异(P0.05),但A-II组与C-I组差异明显(P0.05)。结论:通过降低管电压适当提高管电流结合应用低浓度对比剂,肝脏CT动态增强扫描图像质量可满足诊断,同时降低了辐射剂量及对比剂剂量。
[Abstract]:Objective: to investigate the feasibility of dynamic enhanced CT scanning of liver by reducing radiation dose and using low concentration contrast agent. Methods: one hundred and eighty subjects were randomly divided into two groups: group I (270 mg I / ml) and group II (320 mg I / m L iodoxanol), then A (120kV / 300 m A) B) (100kV / 400 m A) C) were scanned with different scans. The mapping conditions were randomly distributed in groups I and II (arterial phase). In the dynamic enhancement scan of the venous phase, delay period; record, The effective radiation dose (eff ective radiation doseed), image CT value and noise value (image of noisegni), signal-to-noise ratio (SNR), (contrast to noise ratiogna (contrast to noise), and overall image quality (overall image quality) were analyzed and compared in each group. Results: the Ed value of group C was lower than that of group A in 3 phase dynamic contrast-enhanced scanning. There were significant differences between the two groups in image quality (NINRRX CNRIQ). (P0.05) Ed in group B was significantly lower than that in group A in dynamic enhanced scan (group A). There was a significant difference between the two groups in image quality (NINRRX CNRIQ) (P0.05). The Ed of group B was significantly lower than that of group A (P < 0.05). There was no significant difference in image quality (P0.05). Under the same scanning condition, there was significant difference in CT value between the two groups (P0.05), but there was no significant difference in image quality between A-II group and B-IC-I group (P0.05), and there was no significant difference in image quality between A-II group and B-I group (P0.05), but there was no significant difference in CT value between B-IC-I group and A-II group (P0.05), but there was no significant difference in CT value between B-I group and A-II group (P0.05). There was significant difference between A-II group and C-I group (P0.05). Conclusion: by decreasing the voltage of the tube and increasing the current of the tube and applying low concentration contrast agent, the quality of dynamic enhanced CT scan image of liver can be satisfied with the diagnosis, and the dose of radiation and contrast agent can be reduced at the same time.
【作者单位】：中南大学湘雅医学院附属海口医院放射科;
【基金】：海南省卫生厅项目(琼卫2011-66) 海口市重点科技项目(2011-0144)~~
【分类号】：R816.5;R575

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