64排螺旋CT低剂量造影剂肺动脉CTA成像的应用效果观察

Observation of the Application Effect of Low-Dose Contrast Agent Pulmonary Artery CTA Imaging With 64 Slice Spiral CT

目的观察64排螺旋CT低剂量造影剂肺动脉CT血管造影(CT angiography,CTA)成像的应用效果。方法选取福建医科大学附属泉州第一医院2021年4月—2023年4月治疗的疑为肺动脉栓塞(pulmonary embolism,PE)患者68例,按随机数字表法分为2组,各34例。2组均进行64排螺旋CT肺动脉CTA成像检查,对照组采用常规剂量造影剂检查,观察组采用低剂量造影剂检查。比较2组肺血管强化CT值、图像质量、图像信噪比(signal noise ratio,SNR)、对比噪声比(contrast noiseratio,CNR)、辐射剂量参数剂量长度乘积(dose length product,DLP)、容积CT剂量指数(CTdoesindex,CTDIvol)及不良反应。结果观察组肺动脉主干、左肺动脉、右肺动脉强化CT值及图像质量评分分别为(433.76±64.61)HU、(428.63±59.45)HU、(429.15±60.23)HU、(3.84±0.33)分,对照组分别为(418.49±62.27)HU、(410.91±57.16)HU、(412.83±58.90)HU、(3.91±0.35)分,差异无统计学意义(P>0.05)。观察组DLP、CTDIvol和不良反应总发生率分别为(173.97±31.29)mGy·cm、(6.07±1.38)mGy、5.88%,对照组分别为(286.52±64.10)mGy·cm、(8.74±2.05)mGy,23.53%,观察组均低于对照组,差异有统计学意义(P<0.05)。观察组SNR、CNR分别为(31.96±4.74)、(36.59±8.21),对照组SNR、CNR分别为(32.75±5.09)、(37.11±8.67),差异无统计学意义(P>0.05)。结论64排螺旋CT检查中采用低剂量造影剂肺动脉CTA成像获得的图像质量与常规剂量造影剂肺动脉CTA成像效果相当,但64排螺旋CT低剂量造影剂肺动脉CTA检查能够减少辐射剂量,降低不良反应发生率,提高检查安全性。

Objective To observe the application effect of 64-row spiral CT low-dose contrast agent pulmonary artery CT angiography(CTA)imaging.Methods A total of 68 patients with suspected pulmonary artery embolism(PE)treated from April 2021 to April 2023 of Quanzhou First Hospital Affiliated to Fujian Medical University were divided into two groups with 34 each.Both groups underwent 64-row spiral CT pulmonary artery CTA imaging,conventional-dose contrast medium in the control group and low-dose contrast medium in the observation group.The pulmonary vascular enhanced CT values,image quality,image signal-to-noise ratio(SNR),contrast to noise ratio(CNR),radiation dose parameters[dose length product(DLP),volume CT dose index(CTDIvol)]and adverse reactions were compared between the two groups.Results The enhanced CT values and image quality scores of the main pulmonary artery,left pulmonary artery,and right pulmonary artery in the observation group were(433.76±64.61)HU,(428.63±59.45)HU,(429.15±60.23)HU,(3.84±0.33)points,respectively.The enhanced CT values and image quality scores of the main pulmonary artery,left pulmonary artery,and right pulmonary artery in the control group were(418.49±62.27)HU,(410.91±57.16)HU,(412.83±58.90)HU,(3.91±0.35)points,respectively.There was no statistically significant difference between the two groups(P>0.05).The total incidence of DLP,CTDIvol,and adverse reactions in the observation group was(173.97±31.29)mGy·cm,(6.07±1.38)mGy,5.88%,while in the control group it was(286.52±64.10)mGy·cm,(8.74±2.05)mGy,23.53%,the observation group was lower than the control group,and the difference was statistically significant(P<0.05).The SNR and CNR of the observation group were(31.96±4.74),(36.59±8.21),respectively,while the SNR and CNR of the control group were(32.75±5.09),(37.11±8.67),respectively,there was no statistically significant difference between the two groups(P>0.05).Conclusion The image quality obtained by low-dose contrast pulmonary artery CTA imaging in 64-row spiral CT examination was comparable to that of conventional dose contrast artery CTA imaging,but 64-row spiral CT low-dose contrast pulmonary CTA could reduce radiation dose,reduce the incidence of adverse reactions and improve examination safety.