基于原始数据域迭代重建技术在颞骨高分辨率CT中的应用

发布时间：2018-01-28 00:54

本文关键词： 耳疾病颞骨体层摄影术 X线计算机迭代重建算法图像处理计算机辅助辐射剂量　出处：《中国医学影像学杂志》2015年03期 　论文类型：期刊论文

【摘要】：目的探讨滤波反投影(FBP)与基于原始数据迭代(SAFIRE)重建对常规剂量颞骨高分辨率CT(HRCT)图像质量的影响,为实现低剂量扫描提供参考。资料与方法 60例行颞骨HRCT患者行常规剂量扫描,分别进行FBP及SAFIRE(strength 1~5)重建,比较6组图像的平均CT值、噪声(SD)、信噪比(SNR)、对比噪声比(CNR)、主观评分及病变检出情况。结果 6组图像平均CT值差异无统计学意义(P0.05);与FBP比较,SAFIRE(strength 1~5)重建SD逐渐下降(F=1.78,P0.05),分别降低23.1%、39.2%、42.4%、54.1%、61.2%;SNR、CNR逐渐升高(F=1.42、3.15,P0.05),SNR分别提高26.6%、40.0%、71.1%、117.7%、153.3%,CNR分别提高17.4%、33.1%、63.2%、104.1%、147.2%。6组图像主观评分差异有统计学意义(P0.05),SAFIRE 2~4较FBP、SAFIRE 1、5评分高,SAFIRE 2~4组间差异无统计学意义(P0.05),SAFIRE 3重建细腻度、边缘锐利度较好,主观评分最高。结论颞骨HRCT常规剂量扫描结合SAFIRE迭代重建技术,能有效提高图像质量,具有潜在的降低辐射剂量的作用。
[Abstract]:Objective to investigate the effect of filtered backprojection (FBP) and original data iterative reconstruction (SAFIREE) on the image quality of conventional dose high resolution CTHRCTs of temporal bone. Data and methods 60 cases of temporal bone HRCT were performed routine dose scan, FBP and SAFIRE(strength 1 ~ 5) reconstruction. The mean CT value, noise SDI, SNR and CNR were compared in 6 groups of images. Results there was no significant difference in average CT value among the 6 groups (P 0.05). Compared with FBP, SD was gradually decreased by 23.1g / 39.2%. 42.4 / 54.1 / 61.2; The CNR of SNR increased gradually (P < 0.05). The SNR increased by 26.6R (40.0%) and 71.1% (71.1%), 117.7% and 153.3%, respectively. CNR increased 17.4and 33.1and 63.2and 104.1respectively. There was significant difference in subjective score of 147.2 images in group B (P 0.05). There was no significant difference in the scores of SAFIRE 2 and 4 between the four groups (P 0.05). Conclusion conventional HRCT dose scan combined with SAFIRE iterative reconstruction technique can effectively improve the image quality. Has the potential to reduce the radiation dose.
【作者单位】：湖南省常德市第一人民医院医学影像科;昆明医科大学第一附属医院医学影像科;
【分类号】：R816.1
【正文快照】： 杨石平1 YANG Shiping吴莉2 WU Li王勇2 WANG Yong韩丹2 HAN Dan通讯作者韩丹Department of Medical Imaging,the FirstAffiliated Hospital,Kunming MedicalUniversity,Kunming 650032,ChinaAddress Correspondence to:HAN DanE-mail:kmhandan@sina.comR323.1;R445.3修回日期

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