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首页> 外文期刊>Journal of Digital Imaging >Evaluation of Irreversible Compression Ratios for Medical Images Thin Slice CT and Update of Canadian Association of Radiologists (CAR) Guidelines
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Evaluation of Irreversible Compression Ratios for Medical Images Thin Slice CT and Update of Canadian Association of Radiologists (CAR) Guidelines

机译：评估医学图像薄片CT不可逆压缩比和更新加拿大放射医师协会（CAR）指南

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摘要

In June 2008, the Canadian Association of Radiologists published its Standards for Irreversible Compression in Digital Diagnostic Imaging within Radiology (Canadian Association of Radiologists 2012). The study suggested that at low levels of compression there was no difference in diagnostic accuracy between uncompressed JPEG and JPEG 2000. There were two exceptions; CT neurological and CT body images resulted in lower rating of image quality (Koff et al., J Digit Imaging 22(6):569–78, 2009). The slice thicknesses used in the previous study were greater than 5 mm. However, other studies (Ringl et al., Radiology 240:869–87, 2006) suggest that thin CT slices might modify image tolerance to irreversible compression. Therefore, a new clinical evaluation using CT slices less than 3 mm was initiated. We examined CT images in four body regions (chest, body, musculoskeletal, and neurological). Twenty-five radiologists from across Canada participated. Each read a total of 70 CTs in his specialty; 10 at each of seven levels of compression (uncompressed, JPEG and JPEG 2000 at low, medium, and high compression (varying by region)). Each reader diagnosed the case, rated his confidence, and compared the compressed to the uncompressed image and rated the degree of degradation. Data were analyzed for sensitivity, specificity, accuracy, confidence, and degradation at three levels and two types of compression as well as the original image. There were no overall differences in sensitivity, specificity, accuracy, or confidence. JPEG images, at all levels of compression, were rated lower in terms of perceived difference (4.16/5 vs. 4.53/5 for JPEG 2000 and 4.68/5 for uncompressed). However, the rating of perceived difference was not significantly correlated with accuracy. Analysis of individual body regions did not reveal any systematic effects of compression in any region.
机译：2008年6月，加拿大放射科医生协会发布了放射学数字诊断成像中不可逆压缩的标准（加拿大放射科医生协会2012）。研究表明，在低压缩级别下，未压缩的JPEG和JPEG 2000之间的诊断准确性没有差异。 CT神经和CT身体图像导致图像质量评级较低（Koff等人，J Digit Imaging 22（6）：569–78，2009）。先前研究中使用的切片厚度大于5毫米。但是，其他研究（Ringl等人，Radiology 240：869-87，2006）建议，薄的CT切片可能会改变图像对不可逆压缩的耐受性。因此，开始使用小于3 mm的CT切片进行新的临床评估。我们检查了四个身体区域（胸部，身体，肌肉骨骼和神经系统）的CT图像。来自加拿大各地的25位放射科医生参加了会议。每个人读他专业的CT总数为70；在七个压缩级别（未压缩，在低，中和高压缩率下JPEG和JPEG 2000（按区域变化））中的每个压缩级别下为10。每个读者都诊断出了这种情况，对他的信心进行了评分，并将压缩后的图像与未压缩的图像进行了比较，并评估了退化程度。在三个级别和两种压缩类型以及原始图像上分析了数据的敏感性，特异性，准确性，置信度和退化。敏感性，特异性，准确性或置信度没有总体差异。 JPEG图像在所有压缩级别上的感知差异均较低（JPEG 2000的分辨率为4.16 / 5 vs 4.53 / 5，未压缩的图像分辨率为4.68 / 5）。但是，感知差异的等级与准确性没有显着相关。对单个身体部位的分析未发现任何部位受压的系统性影响。

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  • 来源
    《Journal of Digital Imaging》 |2013年第3期|440-446|共7页
  • 作者

    David Koff; Peter Bak; André Matos; Geoff Norman;

  • 作者单位

    Department of Radiology McMaster University">(1);

    Department of Radiology McMaster University">(1);

    Department of Radiology McMaster University">(1);

    Department of Clinical Epidemiology and Biostatistics McMaster University">(2);

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  • 正文语种 eng
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  • 关键词

    Compression; CT;

    机译：压缩;电脑断层扫描;

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