Application of snapshot assist spectral CT in prospective ECG gating coranary artery imaging / 中国医学影像技术

ABSTRACT

Objective To investigate the clinical value of snapshot assist (SSA) of the gemstone CT in prospective ECG-gated 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 (x2 =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)mSy.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.