摘要
目的:探讨低辐射剂量扫描联合低剂量造影剂技术在320排容积CT冠脉成像中的可行性。方法:选取在医院进行冠状动脉CT血管造影(CTA)成像的60例患者,所有患者均接受320排动态容积CT的冠脉CTA检查与复查,检查时均行常规扫描模式+常规剂量造影剂方法;复查时均行低管电压、自动管电流调制扫描模式+低剂量造影剂的方法(低剂量联合扫描),扫描数据均采用自适应统计迭代(ASIR)的重建算法。对比分析两种方法冠状动脉成像图像质量的CT值、噪声、信噪比(SNR)和对比噪声比(CNR)以及有效辐射剂量(ED)。结果:低剂量联合扫描方法其冠状动脉主支血管强化CT值高于常规检查,两种方法比较差异有统计学意义(t=4.212,P<0.05);噪声、SNR和CNR差异及图像质量主观评分比较均无统计学意义(t=1.771,t=0.426,t=1.633,t=1.956,t=-0.880,t=-0.849,t=-1.756,t=-1.252,t=1.240,t=0.184,t=-1.731,t=-0.911,t=-1.950,P>0.05)。常规扫描方法符合诊断需求的节段数占99.9%(899/900),低剂量联合扫描方法符合诊断需求的节段数占99.8%(898/900)。两种扫描方法有效辐射剂量(ED)常规扫描为(24.9±8.4)mSv,高于低剂量联合扫描(10.2±2.6)mSv,两种扫描方法比较差异有统计学意义(t=-6.078,P<0.05)。结论:320排CT冠状动脉血管成像中低管电压、自动管电流调制扫描模式联合低剂量造影剂技术在保证图像质量的同时可降低患者的辐射剂量和造影剂用量。
Objective To investigate the feasibility that low radiation dose scanning combined with low dose contrastagent was used in 320 slices CT coronary angiography. Methods： All of 60 patients who received the detection ofcoronary computed tomography angiography （CTA） were implemented the examination and reexamination of 320slices dynamic coronary CTA, and one examination used low tube voltage and automatic tube current modulationmodel combined with low dose contrast agent, and other examination used routine scanning model combinedwith routine dose contrast agent. Both of the scanning data of the two examinations were obtained by applyingreconstructing algorithm of adaptive statistical iterative reconstruction algorithm （ASIR）. The image quality ofcoronary artery imaging （CT value, noise, SNR, CNR and ED） between the two examinations were compared andanalyzed. Results： The main branch vessel CT value of coronary artery of low dose combined with scanning wassignificantly higher than that of routine examination （t=4.212, P〈0.05）. The differences of noise, SNR, CNR andsubjective scoring of image quality between the two examinations were not statistically significant（t=1.771, t=0.426,t=1.633, t=1.956, t=-0.880, t=-0.849, t=-1.756, t=-1.252, t=1.240, t=0.184, t=-1.731, t=-0.911, t=-1.950, P〉0.05）.The number of segments that met the diagnostic requirements in the routine examination was 99.9% （899/900）, andthe number in the low dose combined with scanning was 99.8% （898/900）. Besides, the ED of routine examination（24.9±8.4 mSv） was significantly higher than that of low dose combined with scanning （10.18±2.56 mSv）（t=-6.078,P〈0.05）. Conclusion： In the 320 slices coronary computed tomography angiography, low tube voltage and automatictube current modulation model combined with low dose contrast agent not only guarantees the image quality butalso reduces the radiation dose and dosage of contrast agent.
出处
《中国医学装备》
2017年第9期66-70,共5页
China Medical Equipment
