能谱CT低管电压对下肢血管成像图像质量及辐射剂量影响

发布时间：2018-08-23 20:37

【摘要】：目的:探讨能谱CT低管电压技术对下肢动脉成像图像质量及辐射剂量的影响。方法:将72例行下肢CT血管成像(CTA)的患者随机分为A、B、C三组,三组管电压分别为120kV、100kV及80kV,其余扫描参数保持一致。根据原始图像和最大密度投影(MIP)重组图像对三组下肢动脉图像质量进行评分,测量血管CT值、信噪比(SNR)、对比信噪比(CNR)及患者所接受的辐射剂量。结果:1三组图像血管CT值C组最高,A组最低,三组间差异有统计学意义(P0.05),图像CNR、SNR组间差异无统计学意义(P0.05);2辐射剂量C组最低,A组最高。与A组相比,B、C组CT剂量指数(CTDIvol)、剂量长度乘积(DLP)及有效剂量(ED)分别降低35.8%、34.9%、34.4%及65.8%、64.4%、64.4%,差异均具有统计学意义(P0.05)。结论:能谱CT下肢血管成像使用低管电压扫描可满足临床诊断需求,且可大大降低患者所接受的辐射剂量。
[Abstract]:Objective: to investigate the effect of CT low tube voltage technique on image quality and radiation dose of lower extremity arterial imaging. Methods: Seventy-two patients with lower extremity CT angiography (CTA) were randomly divided into three groups. The voltage of the three groups was 120 kV / 100 kV and 80 kV respectively, and the other scanning parameters were the same. According to the original image and the maximum density projection (MIP) recombination image, the lower extremity arterial image quality of the three groups was evaluated, the CT value of blood vessel was measured, the signal-to-noise ratio (SNR) (SNR), was compared with the SNR (CNR) and the radiation dose accepted by the patients. Results the CT value of blood vessel in group C was the lowest in group C, and the difference among three groups was statistically significant (P 0.05). There was no significant difference among groups of image CNR,SNR (P0.05). The lowest dose of radiation in group C was the highest in group A (P 0.05). Compared with group A, CT dose index (CTDIvol),) dose length product (DLP) and effective dose (ED) in group C decreased 35.8and 34.4%, respectively, and 64.4%, respectively. The difference was statistically significant (P0.05). Conclusion: EDS CT lower limb angiography with low tube voltage scan can meet the needs of clinical diagnosis and can greatly reduce the radiation dose accepted by patients.
【作者单位】：安徽医科大学第一附属医院放射科;
【分类号】：R543.5;R816.2

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