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首页> 外文期刊>Radiology >Standard and reduced radiation dose liver CT images: Adaptive statistical iterative reconstruction versus model-based iterative reconstruction-comparison of findings and image quality
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Standard and reduced radiation dose liver CT images: Adaptive statistical iterative reconstruction versus model-based iterative reconstruction-comparison of findings and image quality

机译：标准和减少辐射剂量肝CT图像：适应性统计迭代重建与模型的迭代重建 - 结果和图像质量比较

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Purpose: To investigate whether reduced radiation dose liver computed tomography (CT) images reconstructed with modelbased iterative reconstruction (MBIR) might compromise depiction of clinically relevant findings or might have decreased image quality when compared with clinical standard radiation dose CT images reconstructed with adaptive statistical iterative reconstruction (ASIR).Materials and Methods: With institutional review board approval, informed consent, and HIPAA compliance, 50 patients (39 men, 11 women) were prospectively included who underwent liver CT. After a portal venous pass with ASIR images, a 60% reduced radiation dose pass was added with MBIR images. One reviewer scored ASIR image quality and marked findings. Two additional independent reviewers noted whether marked findings were present on MBIR images and assigned scores for relative conspicuity, spatial resolution, image noise, and image quality. Liver and aorta Hounsfield units and image noise were measured. Volume CT dose index and size-specific dose estimate (SSDE) were recorded. Qualitative reviewer scores were summarized. Formal statistical inference for signal-to-noise ratio (SNR), contrastto-noise ratio (CNR), volume CT dose index, and SSDE was made (paired t tests), with Bonferroni adjustment.Results: Two independent reviewers identified all 136 ASIR image findings (n = 272) on MBIR images, scoring them as equal or better for conspicuity, spatial resolution, and image noise in 94.1% (256 of 272), 96.7% (263 of 272), and 99.3% (270 of 272), respectively. In 50 image sets, two reviewers (n = 100) scored overall image quality as sufficient or good with MBIR in 99% (99 of 100). Liver SNR was significantly greater for MBIR (10.8 ± 2.5 [standard deviation] vs 7.7 ± 1.4, P < .001); there was no difference for CNR (2.5 ± 1.4 vs 2.4 ± 1.4, P = .45). For ASIR and MBIR, respectively, volume CT dose index was 15.2 mGy ± 7.6 versus 6.2 mGy ± 3.6; SSDE was 16.4 mGy ± 6.6 versus 6.7 mGy ± 3.1 (P < .001).Conclusion: Liver CT images reconstructed with MBIR may allow up to 59% radiation dose reduction compared with the dose with ASIR, without compromising depiction of findings or image quality.
机译：目的：为了研究与型号迭代重建（MBIR）重建的减少辐射剂量肝脏计算断层扫描（CT）图像是否可能会损害临床相关发现的描述，或者在与具有自适应统计迭代的临床标准辐射剂量CT图像相比时可能会降低图像质量重建（ASIR）。材料和方法：随着机构审查委员会批准，知情同意和HIPAA合规性，50名患者（39名男性，11名女性）被审查患者接受了肝脏CT。在具有ASIR图像的门静脉通过后，用MBIR图像加入60％降低的辐射剂量通过。一个审阅者评分ASIR图像质量和标记的调查结果。另外两个独立审阅者注意到MBIR图像上是否存在标记的发现，并为相对链接，空间分辨率，图像噪声和图像质量指定分数。测量肝脏和主动脉Hounsfield单位和图像噪声。记录体积CT剂量指数和尺寸特异性剂量估计（SSDE）。定性评论者得分总结了。对信噪比（SNR），对比度噪声比（CNR），体积CT剂量指数和SSDE进行正式统计推断（配对T测试），具有Bonferroni调整。结果：两个独立审查员确定了所有136 Asir在MBIR图像上的图像发现（n = 272），为PINSPICENY，空间分辨率和图像噪声等同或更好地评分为94.1％（256个），96.7％（263个），99.3％（272分） ）， 分别。在50个图像集中，两个审阅者（n = 100）在99％（99个中的99个）中，MBIR的总体图像质量均可达到足够或良好。 MBIR的肝脏SNR显着更大（10.8±2.5 [标准偏差] VS 7.7±1.4，P <.001）; CNR没有差异（2.5±1.4 Vs 2.4±1.4，P = .45）。对于ASIR和MBIR，分别是CT剂量指数的体积为15.2 MGY±7.6与6.2 MGO±3.6; SSDE为16.4 MGY±6.6与6.7 MGY±3.1（P <.001）。结论：与MBIR重建的肝CT图像可以允许高达59％的辐射剂量减少，与ASIR的剂量相比，不损害调查结果或图像质量。 。

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  • 来源
    《Radiology》 |2014年第3期|共8页
  • 作者

    ShumanW.P.; ChanK.T.; BuseyJ.M.; MitsumoriL.M.; ChoiE.; KoprowiczK.M.; KanalK.M.;

  • 作者单位

    Department of Radiology University of Washington School of Medicine Box 357115 1959 NE Pacific;

    Department of Radiology University of Washington School of Medicine Box 357115 1959 NE Pacific;

    Department of Radiology University of Washington School of Medicine Box 357115 1959 NE Pacific;

    Department of Radiology University of Washington School of Medicine Box 357115 1959 NE Pacific;

    Department of Radiology University of Washington School of Medicine Box 357115 1959 NE Pacific;

    Department of Radiology University of Washington School of Medicine Box 357115 1959 NE Pacific;

    Department of Radiology University of Washington School of Medicine Box 357115 1959 NE Pacific;

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  • 正文语种 eng
  • 中图分类 放射医学;
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