安徽医科大学学报Issue(2)：210-213,4.
能谱CT消除肺动脉CTA中上腔静脉伪影的应用价值
The application value of Gemstone spectral CT for reducing beam-harding artifacts of the superior vein in the CTPA
史自锋 1程琦 1赵娜 1金启安 1李丹 1许实成 1赵英明 1何峰1
作者信息
- 1. 安徽医科大学附属省立医院影像科，合肥 230001
- 折叠
摘要
Abstract
Objective To evaluate the value of monochromatic images of Gemstone spectral CT for reducing the beam-hardening artifacts cause by contrast media of the superior vein in CT pulmonary angiography( CTPA) . Meth-ods 50 patients of CTPA were scaned with Gemstone spectral imaging ( GSI ) examination, in workstation of ADW4.5 using the superior vein artifacts vein as the background for best contrast to noise ratio( CNR);obtaining monochromtic images to show the pulmonary artery;comparing the monochromatic images with mixture energy image from seven aspects as the superior vein artifacts and pulmonary CT number and noise,artifact index ( AI) and sub-jective scores of image quality and relative noise;using paired t test and Kappa test and parameter estimation of mean for best keV number analysis and 95% interval estimation. Results The superior vein artifacts average CT number of monochromatic images group was below mixture energy image group ( P<0.01 ) . Pulmonary average CT number of monochromatic images group was higher than mixture energy group(P<0.01). The pulmonary artery av-erage noise number ( SD number ) of monochromatic images group was lower than mixture energy group ( P =0.021 ) . Relative AI of two groups ( the superior vein artifacts CT number/pulmonary CT number ) monochromatic images group was lower than mixture energy group(P<0.01). The subjective average score of image monochromat-ic images group points was higher than mixture energy group(Kappa=0.180,P=0.031). Relative noise number ( pulmonary SD number/the superior vein artifacts SD number) monochromatic images group was lower than mix-ture energy group(P<0.05). Those 6 aspects all had statistical significance. Average noise number (SD umber) of the superior vein artifacts monochromatic images group and mixture energy group had no statistical significance. Conclusion The best single energy spectrum CT imaging technology can effectively reduce the beam-hardening ar-tifacts caused by contrast media of the superior vein in CTPA,significantly improving the image quality of the pul-monary artery CTA.关键词
能谱成像/体层摄影术,X线计算机/肺动脉/伪影Key words
spectral imaging/tomography,X-ray computed/pulmonary/artifacts分类
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史自锋,程琦,赵娜,金启安,李丹,许实成,赵英明,何峰..能谱CT消除肺动脉CTA中上腔静脉伪影的应用价值[J].安徽医科大学学报,2014,(2):210-213,4.
