迭代重建技术在肥胖病人肾上腺CT成像中的应用

发布时间：2018-03-13 01:34

本文选题：体层摄影术　切入点：X线计算机　出处：《国际医学放射学杂志》2016年05期 　论文类型：期刊论文

【摘要】：目的将自适应迭代重建技术(ASi R)用于肥胖病人的肾上腺CT成像,旨在评价ASi R在降低辐射剂量和提高影像质量中的应用价值。方法收集200例肥胖病人并行肾上腺CT扫描,男112例,女88例,年龄17~78岁,平均(54.22±18.63)岁,分为2组,各100例。A组行常规剂量的滤过反投影(FBP)重建,B组为降低剂量的ASi R 4个等级(未降低,分别降低30%、50%、100%)重建,所有重建图像传送至AW4.6工作站,分别由3名CT诊断医师采用双盲法对两组影像质量进行评价。采用t检验对比两组辐射剂量,单因素方差分析比较影像质量的客观指标(噪声、SNR、CNR)及主观评分,组间多重比较采用LSD-t检验。采用Kappa检验评价3名医师主观评分一致性。结果 A组与B组4个不同迭代等级的重建影像进行比较,B组中各重建的肾上腺噪声、肌肉噪声及脂肪噪声均随迭代等级升高而下降,SNR及CNR随迭代等级的升高而升高(P0.05)。其中,ASi R50%时各部位噪声、肾上腺SNR与FBP重建相近(P0.05)。3名医师主观评分为一致性较好(Kappa=0.76)。影像质量显示能力评分由高到低依次为ASi R100%、A组FBP、ASi R50%、ASi R30%、ASi RNone(P0.05)。结论在肥胖病人肾上腺CT成像中应用ASi R技术显著降低了辐射剂量,ASi R(50%~100%)所得影像质量近似或优于传统FBP。
[Abstract]:Objective to evaluate the value of ASi R in reducing radiation dose and improving image quality in adrenal gland CT imaging of obese patients using adaptive iterative reconstruction technique (ASI R). Methods 200 obese patients were examined with adrenal CT scan. 112 males and 88 females, aged 1778 years, with an average age of 54.22 卤18.63 years, were divided into two groups. Each group (100 cases) was reconstructed with conventional dose of FBP (FBP). Group B had four grades of ASi R with low dose (no decrease, with a reduction of 30 ~ 50% and 100%). All the reconstructed images were transmitted to the AW4.6 workstation, and the quality of the two groups was evaluated by three CT diagnostics using double-blind method. T test was used to compare the radiation doses between the two groups. Single factor ANOVA was used to compare the objective index (noise SNR CNRR) and subjective score of image quality. LSD-t test was used for multiple comparisons among groups, and Kappa test was used to evaluate the consistency of subjective scores of 3 physicians. Results the reconstructed images of group A and group B were compared with each other in 4 different iterations. The muscle noise and fat noise decreased with the increase of iterative grade and CNR increased with the increase of iterative grade. The subjective scores of adrenal SNR and FBP reconstruction were similar to that of P0.053.The subjective scores of the doctors were good. The imaging quality scores were ASi R100 and A in turn from high to low. Conclusion ASi R technique is used in the adrenal CT imaging of obese patients. The image quality is similar to or superior to that of traditional FBPs.
【作者单位】：郴州市第一人民医院医学影像中心;
【分类号】：R589.2;R816.6

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