多层螺旋CT低剂量扫描技术在甲状腺增强扫描中的临床应用

目的：探讨多层螺旋 CT 低剂量扫描技术在甲状腺增强扫描中的临床应用价值。方法80例患者随机分为4组(每组各20例),4组分别为：A 组,120 kV、180 mA；B 组,120 kV、100 mA；C 组,100 kV、180 mA；D 组,100 kV、100 mA。主观评价图像质量并评分,统计甲状腺 CT 值、图像背景噪声(N)、图像信噪比(SNR)、CT 剂量指数(CTDIvol)、剂量长度乘积(DLP)、有效辐射剂量(ED)并进行对比分析。结果4组图像主观评分为3.90±0.31、3.75±0.44、3.70±0.47、3.60±0.60,SNR 为26.34±3.13、25.08±1.87、25.86±2.38、24.87±2.20,四者无统计学差异(P >0.05)；甲状腺 CT 值为(168.55±13.39)HU、(170.70±11.34)HU、(185.20±22.35)HU、(190.55±21.38)HU,N 为(6.48±0.84)HU、(6.83±0.45)HU、(7.19±0.86)HU、(7.66±1.01)HU, CTDIvol 为(10.95±0.00)mGy、(6.08±0.00)mGy、(6.59±0.00)mGy、(3.66±0.00)mGy,DLP 为(145.67±8.79)mGy·cm、(84.58±4.94)mGy·cm、(89.86±3.26)mGy·cm、(50.20±1.89)mGy·cm,ED 为(0.73±0.04)mSv、(0.42±0.03)mSv、(0.45±0.03)mSv、(0.25±0.01)mSv,四者有统计学差异(P <0.05)。结论多层螺旋 CT 低剂量扫描技术既能保证图像质量又能有效降低甲状腺增强 CT 检查的辐射剂量。

Clinical application of multi-slice spiral CT low-dose scanning technology in thyroid enhanced scan

Objective To evaluate the value of multi-slice spiral CT Low-dose scanning technology in thyroid enhanced scan. Methods Eighty patients were randomly divided into four groups including Group A:120 kV,180 mA;Group B:120 kV,100 mA;Group C:100 kV,180 mA and Group D:100 kV,100 mA.The subjective image quality was evaluated and scored.Thyroid CT val-ue,image background noise (N),image signal to noise ratio (SNR),CT dose index (CTDIvol),dose length product (DLP),and the effective radiation dose (ED)were measured and compared.Results The subjective image scores and SNR of these four groups were 3.90±0.31 and 26.34±3.13,3.75±0.44 and 25.08 ±1.87,3.70 ±0.47 and 25.86 ±2.38,3.60 ±0.60 and 24.87 ±2.20 respectively.There were no significantly statistical differences among the subjective image scores and SNR (P > 0.05 )of the 4 Groups.Thyroid CT values,N,CTDIvol,DLP and ED were (1 68.55 ± 13.39)HU,(6.48 ±0.84)HU,(10.95 ±0.00)mGy, (145.67±8.79)mGy·cm,(0.73±0.04)mSv in Group A,(170.70±11.34)HU,(6.83±0.45)HU,(6.08±0.00)mGy,(84.58± 4 .9 4)mGy· cm,(0 .4 2 ±0 .0 3 )mSv in Group B,(1 8 5 .2 0 ±2 2 .3 5 )HU,(7 .1 9 ±0 .8 6 )HU,(6 .5 9 ±0 .0 0 )mGy,(8 9 .8 6 ± 3 .2 6 )mGy· cm,(0 .4 5 ±0 .0 3 )mSv in Group C,(1 9 0 .5 5 ±2 1 .3 8 )HU,(7 .6 6 ± 1 .0 1 )HU,(3 .6 6 ±0 .0 0 )mGy,(5 0 .2 0 ± 1 .8 9 )mGy·cm,(0.25±0.01)mSv in Group D respectively.There were significantly statistical differences among different thyroid CT values,N,CTDIvol,DLP and ED (P <0.05).Conclusion Multi-slice spiral CT low-dose scanning technology in thyroid en-hanced scan can guarantee the image quality and effectively reduce thyroid radiation dose.