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Comparison and Evaluation of JPEG and JPEG2000 in Medical Images forCR (Computed Radiography)

机译:用于CR(计算机射线照相)的医学图像中JPEG和JPEG2000的比较和评估

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Computed radiography (CR) images will require large storage facilities and long transmission times for picture archiving and communications system (PACS) implementation. The American College of Radiology and National Equipment Manufacturers Association (ACR/NEMA) group is planning to adopt a JPEG2000 compression algorithm in the Digital Imaging and Communications in Medicine (DICOM) standard for better utilization of medical images. The purpose of this study was to evaluate and compare the results of JPEG and JPEG2000 compressions in medical images. We applied various compression ratios of JPEG and JPEG2000 to chest, abdomen, and hand images obtained using the AGFA CR (Computed Radiography) system (AGFA MD-4.0, BELGIUM) and the FUJI CR system (FCR 9000C, JAPAN). A quantitative evaluation was carried out using the PSNR (peak signal to noise ratio), which is a commonly used measure for the evaluation of reconstructed images and measures how the reconstructed images differ from the original images. In the JPEG and JPEG2000 comparison for compression ratios up to 60:1, the PSNR value showed less than 30 dB in accordance with CR modalities and image regions in JPEG compression whereas JPEG2000 showed more than 30 dB in the same compression ratios for both AGFA and FUJI CR images. As the compression ratios were increased to 200:1, use of the JPEG2000 algorithm showed over 30 dB of the PSNR value in accordance with CR modalities and image regions. In general, when the PSNR value gets greater than or equal to 30 dB, the quality of the processed image is acceptable. Nevertheless, the PSNR value cannot absolutely stand for the quality in terms of perceptibility. The artifact of blockiness is found to be visible not only for the AGFA CR image at 40:1 but also for the FUJI CR image at 40:1 and 60:1 in JPEG compression while no significant artifact were observed in the JPEG2000 compressed image up to 200:1. In conclusion, JPEG2000 appeared to be a more effective method of compression than JPEG in medical imaging applications based on the PSNR value, ROC studies may be needed to establish whether these applications are suitable for real clinical situations requiring diagnostic accuracy.
机译:计算机射线照相(CR)图像将需要大型存储设施和较长的传输时间,以实现图片存档和通信系统(PACS)。美国放射学会和美国国家设备制造商协会(ACR / NEMA)组正计划在医学数字成像和通信(DICOM)标准中采用JPEG2000压缩算法,以更好地利用医学图像。这项研究的目的是评估和比较医学图像中JPEG和JPEG2000压缩的结果。我们对使用AGFA CR(计算机放射成像)系统(AGFA MD-4.0,比利时)和FUJI CR系统(FCR 9000C,日本)获得的胸部,腹部和手部图像应用了各种JPEG和JPEG2000压缩率。使用PSNR(峰值信噪比)进行了定量评估,PSNR是评估重建图像的常用方法,并测量重建图像与原始图像的区别。在JPEG和JPEG2000压缩比高达60:1的比较中,根据CR模态和JPEG压缩中的图像区域,PSNR值显示小于30 dB,而AGFA和JPEG2000在相同压缩比下显示JPEG 30显示大于30 dB。 FUJI CR影像。随着压缩率增加到200:1,根据CR模式和图像区域,使用JPEG2000算法显示出超过30 dB的PSNR值。通常,当PSNR值大于或等于30 dB时,已处理图像的质量是可以接受的。然而,就可感知性而言,PSNR值不能绝对代表质量。发现在JPEG压缩中,不仅对于40:1的AGFA CR图像,而且对于40:1和60:1的FUJI CR图像,均可见到块状伪影,而在JPEG2000压缩图像中,没有观察到明显的伪影。到200:1。总之,在基于PSNR值的医学成像应用中,JPEG2000似乎是比JPEG更有效的压缩方法,可能需要进行ROC研究,以确定这些应用是否适合需要诊断准确性的实际临床情况。

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