摘要
目的探讨能谱CT snapshot assist(SSA)技术在前瞻性心电门控冠状动脉成像中降低患者辐射剂量中的应用价值。方法收集行前瞻性心电门控冠状动脉成像的患者59例,分为SSA组及常规组,SSA组采用SSA技术扫描。比较SSA组与常规组图像质量和剂量长度乘积(DLP)、有效辐射剂量(ED)的差异。结果 2组图像质量评分差异无统计学意义(χ~2=2.362,P=0.307),2组冠状动脉CTA左主干起始处的主动脉根部平均CT值差异无统计学意义(Z=-0.061,P=0.951);噪声、CNR、SNR差异均有统计学意义(P均<0.05)。SSA组DLP为(135.44±37.41)mGy·cm,ED为(1.89±0.52)mSv,常规组DLP为(275.57±36.59)mGy·cm,ED为(3.85±0.51)mSv,2组差异均有统计学意义(t=14.504,P均<0.001),SSA组较常规组有效辐射剂量降低约50.85%。结论能谱CT的SSA技术在前瞻性心电门控扫描冠状动脉成像中可以降低患者的有效辐射剂量,具有较高的临床应用价值。
Objective To investigate the clinical value of snapshot assist（SSA）of the gemstone CT in prospective ECGgated coronary artery angiography in reducing radiation dose.Methods A total of 59 patients with prospective ECG-gated coronary angiography were enrolled,who were divided into SSA group and routine group.The SSA group was scanned with SSA technique.The difference were compared between SSA group and conventional group in image quality,dose length product（DLP）and effective dose（ED）.Results There was no significant difference of image quality scores between the two groups（χ^2=2.362,P=0.307）.There was also no significant difference in the mean CT value of the aorta root between the two groups（Z=-0.061,P=0.951）.While the differences of noise,CNR and SNR were statistically significant（all P〈0.05）.The DLP and ED of SSA group were（135.44±37.41）mGy·cm and（1.89±0.52）mSv.And the DLP and ED of routine group were（275.57±36.59）mGy·cm and（3.85±0.51）mSv.There were significant differences between the two groups（t=14.504,P〈0.01）.The ED reduced about 50.85%in SSA group compared with that in routine group.Conclusion The SSA technology can reduce the effective radiation dose of patients in prospective ECG gated coronary angiography,and has a high clinical value.
出处
《中国医学影像技术》
CSCD
北大核心
2017年第5期764-767,共4页
Chinese Journal of Medical Imaging Technology
