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Evaluation of the diagnostic quality of chest images compressed with JPEG and wavelet techniques: a preliminary study

机译:评估使用JPEG和小波技术压缩的胸部图像的诊断质量:初步研究

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Abstract: Image compression reduces the amount of space necessary to store digital images and allows quick transmission of images to other hospitals, departments, or clinics. However, the degradation of image quality due to compression may not be acceptable to radiologists or it may affect diagnostic results. A preliminary study with small-scale test procedures was conducted using several chest images with common lung diseases and compressed with JPEG and wavelet techniques at various ratios. Twelve board-certified radiologists were recruited to perform two types of experiments. In the first part of the experiment, presence of lung disease on six images was rated by radiologists. Images presented were either uncompressed or compressed at 32:1 or 48:1 compression ratios. In the second part of the experiment, radiologists were asked to make subjective ratings by comparing the image quality of the uncompressed version of an image with the compressed version of the same image, and then judging the acceptability of the compressed image for diagnosis. The second part examined a finer range of compression ratios (8:1, 16:1, 24:1, 32:1, 44:1, and 48:1). In all cases, radiologists were able to make an accurate diagnosis on the given images with little difficulty, but image degradation perceptibility increased as the compression ratio increased. At higher compression ratios, JPEG images were judged to be less acceptable than wavelet-based images, however, radiologists believed that all the images were still acceptable for diagnosis. Results of this study will be used for later comparison with large-scale studies. !6
机译:摘要:图像压缩减少了存储数字图像所需的空间量,并允许将图像快速传输到其他医院,部门或诊所。但是,由于压缩而导致的图像质量下降可能对放射科医生而言是不可接受的,或者会影响诊断结果。使用几种具有常见肺部疾病的胸部图像,并以不同比率通过JPEG和小波技术压缩后,使用小规模测试程序进行了初步研究。招募了十二名获得董事会认证的放射科医生,以进行两种类型的实验。在实验的第一部分中,放射科医生对六幅图像上是否存在肺部疾病进行了评估。呈现的图像未压缩或以32:1或48:1压缩比压缩。在实验的第二部分中,要求放射科医生通过比较图像的未压缩版本与同一图像的压缩版本的图像质量,然后判断压缩图像的诊断可接受性,来做出主观评分。第二部分检查了更宽的压缩比范围(8:1、16:1、24:1、32:1、44:1和48:1)。在所有情况下,放射科医生都能轻松地对给定图像进行准确的诊断,但是随着压缩率的增加,图像退化的可感知性也会增加。在较高的压缩比下,JPEG图像被认为比基于小波的图像更不可接受,但是放射学家认为,所有图像对于诊断仍然是可以接受的。这项研究的结果将用于以后与大规模研究的比较。 !6

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