个体化双流注射法在64排螺旋CT肺动脉成像中的应用

Quality analysis of individualized dual flow injection based on patient weight in 64-slice spiral CT pulmonary angiography

目的探究个体化双流注射法在64排螺旋CT肺动脉成像(CTPA)中的应用价值。方法选择2019年7月至2020年10月在韶关市第一人民医院医学影像科行CTPA检查的44例疑似肺动脉栓塞(PE)患者纳入研究,按照时间先后顺序连续入组,其中A组22例采用基于体质量的个体化双时相注射法,B组22例采用基于体质量的个体化双流注射法。计算两组患者肺动脉各段的CT值,比较两组患者图像的噪声标准差图像噪声(SD)、图像信噪比(SNR)、对比噪声比(CNR),同时比较两组患者的CT容积剂量指数(CTDIvol)、剂量长度乘积(DLP)、有效辐射剂量(ED)、对比剂用量。结果两组患者的肺动脉主干、双侧肺动脉、双侧上叶肺动脉、双侧下叶肺动脉、双侧下叶后基底段肺动脉和双侧下叶后基底段亚段肺动脉的CT值比较差异均无统计学意义(P>0.05);两组患者图像的主观评分、SD、SNR、CNR比较差异均无统计学意义(P>0.05);B组患者的CTDIvol、DLP、ED及对比剂用量分别为(4.74±0.31)mGy、(63.3±10.10)mGy·cm、(0.88±0.23)mSv/(mGy·cm)、(18.27±2.25)mL,明显低于A组的(7.74±0.91)mGy、(155.9±23.10)mGy·cm、(2.18±0.59)mSv/(mGy·cm)、(30.45±3.75)mL,差异均有统计学意义(P<0.05)。结论基于患者体质量的个体化双流注射法在不影响诊断的前提下,能显著降低肺动脉CTPA检查的辐射剂量和对比剂用量。

Objective To research the quality analysis of dual flow individualized contrast agent injection based on patient weight in 64slice spiral CT pulmonary angiography(CTPA).Methods Fortyfour patients with suspected pulmonary embolism(PE)who underwent CTPA examination in Department of Medical Imaging,Shaoguan First People's Hospital from July 2019 to October 2020 were enrolled in the study.They were divided into group A and group B according to the admission time.The patients in group A were injected with individualized dual phase injection based on body weight.The patients in group B were given individualized dual flow injection based on body weight during pulmonary artery CT angiography.After the inspection was completed,the CT values of pulmonary artery segments in the two groups were compared,the image noise standard deviation(SD),image signaltonoise ratio(SNR),and contrast to noise ratio(CNR)of the two groups were compared,and the CT volume dose index(CTDIvol),dose length product(DLP),and effective radiation dose(ED)of the two groups were compared.Results The CT values of main pulmonary artery,bilateral pulmonary artery,bilateral superior pulmonary artery,bilateral inferior pulmonary artery,bilateral posterior basal segment pulmonary artery and bilateral posterior basal segment pulmonary artery showed no significant differences between group A and group B(P>0.05).The scores of SD,SNR,CNR,and image quality also showed no significant differences between the two groups(P>0.05).The CTDIvol,DLP,ED,and contrast agent dosage in group B were(4.74±0.31)mGy,(63.3±10.1)mGy·cm,(0.88±0.23)mSv/(mGy·cm),(18.27±2.25)mL,which were significantly lower than(7.74±0.91)mGy,(155.9±23.1)mGy·cm,(2.18±0.59)mSv/(mGy·cm),(30.45±3.75)mL in group A(P<0.05).Conclusion The application effect of individualized dual flow injection based on patient weight in pulmonary artery CT angiography is good.It can significantly reduce radiation dose and contrast agent dosage without affecting the quality of CT image.