摘要
目的探讨能谱CT单能量融合技术对子宫动脉CTA图像质量优化的价值。方法前瞻性分析行能谱CT盆腔或腹盆腔检查的40例女性的影像资料,采用最佳单能量、70 ke V单能量、140 k Vp混合能量及最佳单能量与70 ke V单能量融合图像显示子宫动脉,比较4组图像对比噪声比（CNR）、信噪比（SNR）、背景噪声及图像主观评分。结果子宫动脉最佳单能量范围为60~68 ke V,均值为（62.38±1.61）ke V。最佳单能量组、70 ke V组、140k Vp混合能量组及融合图像组对子宫动脉的CNR分别为23.16±6.48、17.40±4.77、9.51±2.73及24.55±5.97;SNR分别为25.98±6.80、20.32±5.21、11.41±3.00及27.88±6.28;背景噪声分别为25.35±4.74、16.64±3.49、21.30±3.67及18.25±3.07。融合图像组CNR与最佳单能量组间差异无统计学意义（P〉0.05）,余各组两两比较差异均有统计学意义（P〈0.01）;图像主观评分分别为4.03±0.75、3.71±0.77、3.06±0.83及4.24±0.67,融合图像组与最佳单能量组主观评分间差异无统计学意义（P〉0.05）,余各组两两比较差异均有统计学意义（P〈0.01）。融合图像组CNR、SNR及图像主观评分均高于其余3组,背景噪声高于70 ke V单能量组,低于最佳单能量及混合能量组。结论能谱CT单能量融合技术能够优化子宫动脉图像质量,提高子宫动脉远端小分支的显示。
Objective To investigate the value of the monochromatic parameters with fused image of CT angiography（ CTA） on uterine artery using single source dual energy CT with gemstone spectral image（ GSI） technique. Methods The medical imaging data of 40 females underwent pelvic or urinary system scanning with GSI technique were prospectively analyzed,the 140 kVp polychromatic energy group,the 70 keV monochromatic energy group,the optimal monochromatic energy group and the fused image group were used to separately reconstruct uterine arteries. Comparative parameters include contrast to noise ratio（ CNR）,signal to noise ratio（ SNR）,the background noise of image and subjective scores of the uterine arteries. One-way ANOVA and Kruskal Wallis H test was used to statistical analysis. Results The optimal monochromatic energy range of the uterine artery CTA was 60 to 68 ke V,the mean value was（ 62. 38 ± 1. 61） keV. CNR of the4 groups were 23. 16 ± 6. 48,17. 40 ± 4. 77,9. 51 ± 2. 73 and 24. 55 ± 5. 97 respectively. SNR were 25. 98 ± 6. 80,20. 32± 5. 21,11. 41 ± 3. 00 and 27. 88 ± 6. 28 respectively. The background noise of image was 25. 35 ± 4. 74,16. 64 ± 3. 49,21. 30 ± 3. 67 and 18. 25 ± 3. 07 respectively. Subjective scores were 4. 03 ± 0. 75,3. 71 ± 0. 77,3. 06 ± 0. 83 and 4. 24 ±0. 67. CNR,SNR,the background noise of image and subjective scores had significant difference among the four groups（ P〈 0. 01）. The fused image group was higher than the other 3 groups in CNR,SNR and subjective scores,the background noise of image was lower than 70 ke V monochromatic energy group while higher than the other 2 groups. Conclusion The optimal monochromatic energy value was（ 62. 38 ± 1. 61） ke V. The fused image group can remarkably improve CTA quality of the uterine arteries which would promote the study of the image anatomy of uterine arteries.
出处
《临床放射学杂志》
CSCD
北大核心
2016年第4期638-642,共5页
Journal of Clinical Radiology
基金
国家临床重点专科建设项目(国卫办医函[2013]544号)
关键词
子宫动脉
能谱CT
体层摄影术
X线计算机
Uterine artery
Gemstone spectral imaging
Tomography,X-ray computed
