Sugiyama Naoki, Igarashi Yoshiaki, Kohda Ehiichi, Kohno Atsushi, Suzuki Sohtaro, Tanaka Takao, Chiyasu Shikibu, Yokokura Toshiaki
Department of Radiological Sciences, International University of Health and Welfare.
Nihon Igaku Hoshasen Gakkai Zasshi. 2005 Oct;65(4):359-67.
With the increasing demand on picture archiving and communication systems (PACS) to handle larger numbers of images, much research has been conducted on the utilization of lossy compression for efficient communication and storage in PACS systems. The receiver operating characteristics (ROC) method is commonly used to determine the appropriate compression ratio of lossy images. However, conducting an ROC experiment is impractical at actual medical facilities because it is difficult to prepare and interpret images with different compression ratios for each modality, body part, and acquisition method. On the other hand, experienced radiologists have the ability to subjectively assess the level of image quality required for interpretatior and quantitative analysis. Therefore, by simply viewing images, they are able to determine the appropriate criteria for image quality and derive a practical compression ratio for each application. The present study focused on lossy compression as employed in teleradiology systems for medical checkups. Experiments comparing radiologists' subjective assessment of compressed images against the diagnostic results obtained using these images were conducted in order to investigate appropriate compression ratios and efficient methods for determining them.
随着对图像存档与通信系统（PACS）处理大量图像的需求不断增加，人们针对有损压缩在PACS系统中的高效通信和存储应用开展了大量研究。常用接收器操作特性（ROC）方法来确定有损图像的合适压缩率。然而，在实际医疗设施中进行ROC实验并不现实，因为针对每种模态、身体部位和采集方法准备和解读具有不同压缩率的图像很困难。另一方面，经验丰富的放射科医生有能力主观评估解读和定量分析所需的图像质量水平。因此，通过简单查看图像，他们就能确定图像质量的合适标准，并得出每种应用的实用压缩率。本研究聚焦于用于医学体检的远程放射学系统中所采用的有损压缩。进行了实验，将放射科医生对压缩图像的主观评估与使用这些图像获得的诊断结果进行比较，以研究合适的压缩率及确定这些压缩率的有效方法。
