腹部双能量能谱CT成像中混合能量模式与单能量模式重建图像的比较研究  

Comparative study of abdominal imaging quality between mixed energy mode and mono-energy mode reconstruction on dual-energy spectral CT

作　　者：韦炜[1] 邓克学[1] 赵英明[1] 罗英姿[1] 

机构地区：[1]安徽医科大学附属省立医院影像科,合肥230001

出　　处：《安徽医科大学学报》2016年第11期1650-1653,共4页Acta Universitatis Medicinalis Anhui

基　　金：安徽省科技厅公益性技术应用研究联动计划项目(编号:1501ld04028);国家自然基金青年科学基金项目(编号:81501468)

摘　　要：目的通过比较双能量CT腹部能谱成像后,混合能量模式(Quality Check,140 k Vp)与单能量模式(Mono,70ke V)重建图像的质量,选择适合临床应用的重建模式。方法应用双能量能谱CT(Discovery CT750HD),对60例受检者进行腹部平扫及双期增强扫描,分别采用混合能量模式及单能模式进行重建。测量并比较肝脏、脾脏、胰腺及腹腔脂肪的CT值,计算各组织器官的信噪比、对比噪声比,并以评分方法比较两组图像质量。结果单能量重建组中各器官的SNR、CNR均高于混合能量组(P<0.05),单能量重建组主观评分明显高于混合能量组(P<0.001)。结论单能量模式重建图像显著优于常规混合能量模式重建图像,可在临床中常规运用。Objective To evaluate the difference of mixed energy mode and mono-energy mode reconstruction ima- ges on abdomen spectral CT imaging. Methods Abdomen pre-contrast and contrast enhanced CT scans were applied with spectral CT on sixty patients. Images were reconstructed by two-modes：QC mode and Mono mode. The following variables were compared ： signal-to-noise （SNR） of liver, spleen and pancreas, contrast-to-noise （CNR） of liver, spleen and pancreas. Two experienced radiologists evaluated the artifact level of images of the two reconstruction modes. Results Compared with mixed-energy mode images,70 keV mono-energy images yielded significantly greater SNR and CNR （P 〈 0. 05 ）. Subjective score of 70 keV mono-energy images was higher than that of mixedenergy image （P 〈 0. 001 ）. Conclusion In abdominal spectral CT imaging, mono-energy reconstruction can provide higher quality of images than mixed-energy reconstruction and can replace mixed-energy images in clinical diagnosis.

关 键 词：腹部 体层摄影术 X线计算机 能谱CT 重建模式 

分 类 号：R816.5[医药卫生—放射医学]