低剂量CT扫描技术在头颈部CTA中的应用价值研究

The application value of low dose CT scanning technology in CTA of head and neck

目的:探讨低剂量CT(低管电压)扫描技术在头颈部CTA中的临床应用价值。方法:将55例BMI<22.9 kg/m2的成年头颈部血管受检者随机分成两组,分别采用常规剂量(120 kV、175 mA)和低剂量(80 kV、175 mA)进行64排螺旋CT扫描,利用InSpace、Neuro DSA、3D图像后处理软件对图像进行后处理,分析两组受检者的图像质量和诊断价值评估,并使用卡方检验对两组数据进行统计学比较。同时,记录两组患者所接受的辐射剂量值。结果:结果显示常规剂量图像质量略高于低剂量组,但无统计学意义(P>0.05)。信噪比方面低剂量组图像颗粒略增粗,但不影响诊断质量,无统计学意义(P>0.05)。两组患者的BMI值无统计学差异(P>0.05)。低剂量组所接受的辐射剂量远低于常规剂量组,CTDlvol与DLP值分别下降71.22%和72.03%。两组病例中分别有1例图像质量为差的病例,经调查系人为因素所致,未纳入本研究统计学范畴。结论:低剂量CTA扫描技术完全可以运用于头颈部血管性病变的斑块筛查、血管狭窄度评估及支架植入术后评估等,同时可大大降低受检者的医源性辐射剂量。

Objective：To discuss the value of clinical application of low dose CT angiography（CTA） （low voltage） in head and neck.Methods：Fifty-five adults （BMI〈22.9 kg/m2） underwent 64-row head and neck CTA examinations.They were randomly divided into two groups that is those using conventional dose（120 kV,175 mA） and those using low dose（80 kV,175 mA） scanning protocols,respectively.InSpace,Neuro DSA,3D image software were used for postprocessing.Image quality and diagnostic value of the two groups were assessed,the chi-square test was used for statistical comparison of the two groups.The radiation dose of the two groups were also recorded.Results：The results showed that the quality of routine dose image is slightly higher than that of low dose group,but with no statistical significance（P〉0.05）.In the low dose group,the image particles were slightly rough,but did not affect diagnosis,there was no statistical significance（P〉0.05）.The BMI of the two groups showed no statistical significance（P〉0.05）.Radiation dose received by low dose group was lower than that of conventional dose group significantly with CTDlvol and DLP decreased 71.22% and 72.03%,respectively.In each of the two groups,there was 1 case which image quality was poor,respectively,was due to technical factors through investigation,was included as the research category.Conclusion：Low dose CTA scanning technique can be applied for head and neck vascular lesions including plaque screening,vascular stenotic degree evaluation before and after stent implantation.Meanwhile,it can greatly reduce the radiation dosage received by the patients.