非迭代重建时头颈部双低CTA管电流选择的探索

发布时间：2018-09-18 08:17

【摘要】：目的:探讨非迭代重建条件下,身体体质指数(BMI)24kg/m2的患者行头颈部双低剂量(管电压100kVp,对比剂浓度270mg I/mL)CTA检查时,既能满足临床诊断需求又能降低辐射剂量的管电流范围。方法:将BMI24kg/m2,行头颈部双低剂量CTA检查的61例患者分为A、B、C三组。A组:管电流200mA,43例;B组:管电流250mA,10例;C组:管电流310mA,8例。测量、计算三组患者主动脉弓、左右颈总动脉分叉部及左右大脑中动脉起始部的CT值、噪声、信噪比(SNR)、信号噪声比(CNR)、容积CT剂量指数(CTDIvol)及剂量长度乘积(DLP)后进行统计学分析。采用双盲法由两位高年资的CT诊断医师采用5分法对图像质量进行主观评分。结果:A、B、C三组患者年龄和BMI的差异无统计学意义(P0.05);三组患者各层面CT值、噪声、SNR、CNR的差异均无统计学意义(P均0.05);三组间图像主观评分的差异无统计学意义(P0.05)。三组间CTDIvol、DLP差异有统计学意义。结论:在非迭代重建条件下,BMI24kg/m2的患者使用头颈部双低CTA检查时,图像质量能够满足临床诊断需求且辐射剂量降低的管电流范围是200~250mA。
[Abstract]:Objective: to investigate whether the patients with body mass index (BMI) 24kg/m2) undergoing double low dose (tube voltage 100kVp, contrast agent concentration 270mg I/mL) CTA examination under non-iterative reconstruction can meet the clinical diagnostic needs and reduce the radiation dose range of tube currents. Methods: Sixty-one patients with head and neck double low dose CTA were divided into three groups: group A (n = 43): group B (n = 43): current of tube: group B (n = 43): group C (n = 10): tube current: n = 10 (n = 10): group C: group C (n = 10): current: n = 310mAn (n = 8). The CT values, noise, signal-to-noise ratio (SNR) of (SNR), signal to (CNR), volume CT dose index (CTDIvol) and dose length product (DLP) of aortic arch, left and right common carotid artery bifurcation and the starting part of left and right middle cerebral artery were measured and calculated. Using double blind method, two senior CT diagnostics scored image quality subjectively by 5 points method. Results there was no significant difference in age and BMI among the three groups (P0.05), but there was no significant difference in CT value and noise between the three groups (P 0.05), and there was no significant difference in subjective image score among the three groups (P0.05). The difference of CTDIvol,DLP among the three groups was statistically significant. Conclusion: in patients with BMI 24 kg / m 2 under non-iterative reconstruction, the current range of the tube with low head and neck CTA can meet the needs of clinical diagnosis and the radiation dose is reduced to 200 ~ 250mA.
【作者单位】：潍坊市中医院影像中心;潍坊市人民医院超声科;
【分类号】：R816.1

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