前置自适应统计迭代重建技术对胸部CT辐射剂量和图像质量的影响:体模与临床研究

发布时间：2018-03-03 10:18

本文选题：胸部　切入点：体层摄影术　出处：《中国医学影像技术》2017年03期 　论文类型：期刊论文

【摘要】：目的探讨前置基于多模型的自适应统计迭代重建(ASiR-V)技术对胸部CT辐射剂量和图像质量的影响。方法采用GE Revolution CT对胸部仿真体模和120例胸部CT平扫患者(分为6组,每组20例)分别设定前置ASiR-V权重为0、20%、40%、60%、80%、100%进行扫描。管电压120kV,管电流采用自动毫安(Smart mA 10-500)技术,噪声指数设为11。记录胸部体模及各组患者扫描的剂量长度乘积,计算并比较各组有效剂量(ED)。以胸部体模不同组织结构(肺组织、脊柱旁软组织、主动脉和椎体)的CT值和标准差(SD)作为客观指标,结合对各组患者的图像主观评分,比较图像质量的组间差异。结果随着前置ASiR-V权重的增加,体模及患者的ED均呈对数降低,体模不同组织CT值、图像噪声均未见明显改变。ASiR-V权重为40%时纵隔窗和肺窗的主观评分开始下降;60%时纵隔窗和肺窗图像主观评分相对40%时出现明显下降(P0.05)。ASiR-V权重为40%,ED降至ASiR-V权重为0时的57.21%。结论前置ASiR-V可以降低辐射剂量,同时又不影响图像客观指标;前置ASiR-V权重为40%时,图像仍可保证临床诊断需求,且辐射剂量明显降低,临床应用价值最高。
[Abstract]:Objective to explore the pre adaptive statistical iterative reconstruction based on multi model (ASiR-V) of the chest CT radiation dose and image quality. Methods GE Revolution CT simulation on chest phantom and 120 cases of chest CT scan patients (divided into 6 groups, 20 cases in each group) were set in front of ASiR-V weight is 0,20%, 40%. 60%, 80%, 100% for scanning. The tube voltage 120kV, tube current with automatic Ma (Smart mA 10-500), the noise index is set to record 11. dose length product chest phantom and patients in each group were scanned, calculated and compared between groups of effective dose (ED). The chest phantom in different tissues (lung tissue, spinal structure soft tissues, aorta and vertebral CT) and standard deviation (SD) as the objective index, combining with the image subjective score of all patients, compare the image quality of the differences between the groups. Results with the increase of pre ASiR-V weight, phantom and patients were ED Logarithmic reduction, phantom of different CT values, the image noise showed no significant changes in.ASiR-V weight dropped to start the subjective score and pulmonary mediastinal window window 40%; decreased 60% mediastinal window and lung window images of subjective score relative to the 40% when (P0.05).ASiR-V weight is 40%, ED reduced to ASiR-V weight 57.21%. conclusion the pre ASiR-V 0 can reduce the radiation dose, and does not affect the image of objective index; pre ASiR-V weight is 40%, the image can ensure the requirement for clinical diagnosis, and the radiation dose decreased obviously, the highest value in clinical application.

【作者单位】：东南大学医学院附属盐城医院影像科;
【分类号】：R816.4

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