双源CT大螺距扫描联合迭代重建在肺动脉成像中的应用研究

董霞; 武志峰; 鄂林宁; 孟辉强; 吴山

中国临床医学影像杂志 ›› 2014, Vol. 25 ›› Issue (6) : 393-396.

论著

双源CT大螺距扫描联合迭代重建在肺动脉成像中的应用研究

董霞1，武志峰2，鄂林宁2，孟辉强2，吴山2

作者信息 +

The application of both SAFIRE and high-pitch dual-source computed tomography in pulmonary angiography

DONG Xia1, WU Zhi-feng2, E Lin-ning2, MENG Hui-qiang2, WU Shan2

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文章历史 +

摘要

目的：探讨双源CT大螺距（Flash）模式结合迭代重建（SAFIRE）在肺动脉成像中降低辐射剂量、优化图像质量的价值。方法：收集临床疑诊肺动脉栓塞需行CTPA检查、无检查禁忌症的患者60例，每组20例，分别接受不同的扫描模式；由两名放射科医师对图像用5分法进行主观评估，并测量7个肺血管CT值（HU±SD），并计算信号噪声比（SNR）和对比信噪比（CNR），比较辐射曝光参数，包括CT容积剂量指数（CTDIvol）和剂量长度乘积（DLP），并计算有效辐射剂量（ED）；使用SPSS 16.0统计软件对数据进行分析。结果：所有图像均满足诊断要求，3种方案的影像质量在主观评价及客观测量（SNR、CNR）方面均无显著差异（P>0.05），而辐射剂量在不同方案之间不同，实验组2的辐射剂量（CTDvol和DLP）明显低于对照组及实验组1，差异具有统计学意义（P<0.001）。结论：联合应用SAFIRE及Flash扫描模式行CTPA检查时可以在满足图像诊断要求前提下进一步降低辐射剂量。

Abstract

Objective: To evaluate sinogram affirmed iterative reconstruction technique based on raw data(SAFIRE) and high-pitch dual-source computed tomography on CT pulmonary angiography(CTPA) image quality meeting diagnostic requirements and radiation dose reduction. Methods: CTPA was preformed with three protococols: DSCT singal tube model(120 kV), high-pitch DSCT(100 kV), high-pitch DSCT(80 kV). For each protocol, 20 sex, age, and body-mass-index matched patients were identified. Retrospectively, two observers subjectively assessed image quality, measured CT attenuation(HU±SD) at seven central and peripheral levels, and calculated signal-to-noise-ratio(SNR) and contrast-to-noies-ratio(CNR). Radiation exposure parameters(CTDIvol and DLP) were compared. Using SPASS 16.0 statistical software to analyze data. Results: The three protocols did not significantly differ in image quality, neither by subjective, nor by objective measures(SNR, CNR). By contrast, radiation exposure differed between protocols: significant lower radiation was achieved by using high-pitch DSCT at 80 kV(P<0.001). Conclusion: Combined application of both SAFIRE and high-pitch DSCT can further reduce radiation dose on the base of image quality meeting diagnostic requirement.

导出引用

董霞;武志峰;鄂林宁;孟辉强;吴山. 双源CT大螺距扫描联合迭代重建在肺动脉成像中的应用研究[J]. 中国临床医学影像杂志. 2014, 25(6): 393-396

DONG Xia;WU Zhi-feng;E Lin-ning;MENG Hui-qiang;WU Shan. The application of both SAFIRE and high-pitch dual-source computed tomography in pulmonary angiography[J]. Journal of China Clinic Medical Imaging. 2014, 25(6): 393-396

中图分类号： Ｒ563.5 Ｒ814.42