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首页> 美国卫生研究院文献>Journal of Digital Imaging >Perceived fidelity of compressed and reconstructed radiological images: A preliminary exploration of compression luminance and viewing distance
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Perceived fidelity of compressed and reconstructed radiological images: A preliminary exploration of compression luminance and viewing distance

机译：压缩和重建放射线图像的感知保真度：压缩亮度和观察距离的初步探索

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摘要

The authors’ goal was to explore the impact of image compression algorithm and ratio, image luminance, and viewing distance on radiologists’ perception of reconstructed image fidelity. Five radiologists viewed 16 sets of four hard-copy chest radiographs prepared for secondary interpretation. Each set included one uncompressed, and three compressed and reconstruted images prepared using three different algorithms but the same compression ratio. The sets were prepared using two subjects, four compression ratios (10∶1, 20∶1, 30∶1, 40∶1), and two luminance levels (2,400 cd/m2, standard lightbox illumination, and 200 cd/m2, simulating a typical CRT display). Readers ranked image quality and evaluated obviousness and clinical importance of differences. Viewing distances for image screening, inspection, and comparison were recorded. At 10∶1 compression, the compressed and uncompressed images were nearly indistinguishable; the three algorithms were very similar, and differences were rated “not obvious” and “not important.” At higher compression, readers consistently preferred uncompressed images, with notable differences between algorithms. The obviousness and clinical importance of differences were rated higher at lightbox luminance. Viewing distances appeared to be idiosyncratic
机译：作者的目标是探索图像压缩算法和比率，图像亮度和观看距离对放射科医生对重建图像保真度的感知的影响。五位放射科医师查看了准备进行次要解释的16套四张硬拷贝胸片。每一组包括一个未压缩的图像，以及使用三种不同的算法但压缩率相同的三幅压缩和重建的图像。使用两个对象，四个压缩比（10：1，20：1，30：1，40：1）和两个亮度水平（2,400 cd / m 2 ，标准灯箱照明）准备这些场景，以及200 cd / m 2 ，以模拟典型的CRT显示）。读者对图像质量进行排名，并评估差异的明显性和临床重要性。记录用于图像筛选，检查和比较的观察距离。在10：1压缩率下，压缩和未压缩的图像几乎无法区分。这三种算法非常相似，差异被评为“不明显”和“不重要”。在较高的压缩率下，读者始终喜欢未压缩的图像，算法之间存在显着差异。在灯箱亮度下，差异的明显性和临床重要性被评为较高。观看距离似乎很奇怪

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