Egashira K, Nakata H, Watanabe H, Uchida K, Nakamura K, Ishino Y, Horino K, Yoshikawa R
Department of Radiology, University of Occupational and Environmental Health, Kitakyushu-shi, Japan.
J Digit Imaging. 1998 Nov;11(4):176-81. doi: 10.1007/BF03178080.
Efficient data compression is essential for practical daily operation of computed radiography (CR) systems. In this study the clinical applicability of type III irreversible high data compression using an FCR 9501 chest unit (Fuji Photo Film, Tokyo, Japan) was evaluated. Sixty-eight normal and 93 various abnormal cases, with an additional 15 cases of lung cancers with solitary lung nodules, were selected from the file. A pair of hard copies of original images and images reconstructed using type III compression was made for each case. Six radiologists evaluated the image quality by visual rating and receiver operating characteristic (ROC) curve analysis. For all five anatomic regions of normal cases, "original equal to compressed" was the most common response, followed by "original significantly better than compressed." When abnormal cases were evaluated for diagnostic information, there was no significant difference between the compressed and original images. ROC curve analysis on lung nodules with lung cancer showed no significant difference between the two. Compressed CR images using the type III irreversible technique are clinically applicable and acceptable despite slight degradation of image quality.
高效的数据压缩对于计算机放射成像（CR）系统的实际日常操作至关重要。在本研究中，评估了使用FCR 9501胸部成像设备（富士胶片株式会社，东京，日本）进行III型不可逆高数据压缩的临床适用性。从存档文件中选取了68例正常病例和93例各种异常病例，另外还有15例伴有孤立性肺结节的肺癌病例。为每个病例制作了一对原始图像的硬拷贝以及使用III型压缩重建的图像。六名放射科医生通过视觉评分和接受者操作特征（ROC）曲线分析对图像质量进行了评估。对于正常病例的所有五个解剖区域，最常见的反馈是“原始图像与压缩图像相同”，其次是“原始图像明显优于压缩图像”。在评估异常病例的诊断信息时，压缩图像和原始图像之间没有显著差异。对肺癌肺结节的ROC曲线分析表明两者之间没有显著差异。尽管图像质量略有下降，但使用III型不可逆技术压缩的CR图像在临床上是适用且可接受的。
