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ROC Study of Four LCD Displays Under Typical Medical Center Lighting Conditions

机译：在典型医疗中心照明条件下四个LCD显示器的ROC研究

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摘要

Nine observers reviewed a previously assembled library of 320 chest computed radiography (CR) images. Observers participated in four sessions, reading a different 1/4 of the sample on each of four liquid crystal displays: a 2-megapixel (MP) consumer color display, a 2-MP business color display, a 2-MP medical-grade gray display, and a 3-MP gray display. Each display was calibrated according to the DICOM Part 14 standard. The viewing application required observer login, then randomized the order of the subsample seen on the display, and timed the responses of the observer to render a 1–5 judgment on the absence or presence of ILD on chest CRs. Selections of 1–2 were considered negative, 3 was indeterminate, and 4–5 were positive. The order of viewing sessions was also randomized for each observer. The experiment was conducted under controlled lighting, temperature, and sound conditions to mimic conditions typically found in a patient examination room. Lighting was indirect, and illuminance at the display face was 195 ± 8% lux and was monitored over the course of the experiment. The average observer sensitivity for the 2 MP color consumer, 2 MP business color, 2 MP gray, and 3 MP gray displays were 83.7%, 84.1%, 85.5%, and 86.7%, respectively. The only pairwise significant difference was between the 2-MP consumer color and the 2-MP gray (P = 0.05). Effect of order within a session was not signitfficant (P = 0.21): period 1 (84.3%), period 2 (86.2%), period 3 (85.4%), period 4 (84.1%). Observer specificity for the various displays was not statistically significant (P = 0.21). Finally, a timing analysis showed no significant difference between the displays for the user group (P = 0.13), ranging from 5.3 s (2 MP color business) to 5.9 s (3 MP Gray). There was, however, a reduction in time over the study that was significant (P < 0.001) for all users; the group average decreased from 6.5 to 4.7 s per image. Physical measurements of the resolution, contrast, and noise properties of the displays were acquired. Most notably, the noise of the displays varied by 3.5× between the lowest and highest noise displays. Differences in display noise were indicative of observer performance. However, the large difference in the magnitude of the noise was not predictive of the small difference (3%) in the observer sensitivity for various displays. This is likely because detection of interstitial lung disease is limited by “““““anatomical noise””” rather than display or x-ray image noise.
机译：九名观察员审阅了先前组装的320张胸部X射线摄影（CR）图像库。观察员参加了四次会议，分别在四个液晶显示器上读取了不同的1/4样本：一个2百万像素（MP）的消费者彩色显示器，一个2 MP的商业彩色显示器，一个2 MP的医疗级灰色显示器显示屏和3-MP灰色显示屏。每个显示器均根据DICOM Part 14标准进行了校准。查看应用程序要求观察者登录，然后将在显示屏上看到的子样本的顺序随机化，并对观察者的响应进行计时，以对胸部CR上是否存在ILD做出1-5的判断。选择1-2被认为是负面的，选择3是不确定的，选择4-5是正面的。观看会话的顺序也为每个观察者随机分配。实验是在受控的光照，温度和声音条件下进行的，以模仿通常在患者检查室中发现的条件。照明是间接的，显示面上的照度为195±8％lux，并在整个实验过程中进行监控。 2 MP彩色消费者，2 MP商业彩色，2 MP灰度和3 MP灰度显示器的平均观察者灵敏度分别为83.7％，84.1％，85.5％和86.7％。唯一的成对显着差异是2-MP使用者颜色和2-MP灰色之间的差异（P = 0.05）。会议期间的顺序影响不显着（P = 0.21）：第1阶段（84.3％），第2阶段（86.2％），第3阶段（85.4％），第4阶段（84.1％）。各种显示的观察者特异性在统计学上不显着（P = 0.21）。最后，时序分析显示用户组的显示之间没有显着差异（P = 0.13），范围从5.3 s（2 MP彩色商务）到5.9 s（3 MP灰色）。但是，与所有用户相比，该研究的时间减少了很多（P < 0.001）；每张图像的组平均值从6.5 s降低到4.7 s。获得了显示器的分辨率，对比度和噪声特性的物理测量值。最值得注意的是，显示器的噪声在最低和最高噪声显示器之间相差3.5倍。显示噪声的差异指示观察者的表现。但是，噪声幅度的大差异并不能预示各种显示器的观察者灵敏度的小差异（3％）。这可能是因为间质性肺疾病的检测受到““”“解剖噪声””的限制，而不是受显示或X射线图像噪声的限制。

著录项

  • 来源
    《Journal of Digital Imaging》 |2006年第1期|30-40|共11页
  • 作者

    Steve Langer; Ken Fetterly; Jay Mandrekar; Scott Harmsen; Brian Bartholmai; Charles Patton; Alan Bishop; Colin McCannel;

  • 作者单位

    Mayo Clinic and Foundation Department of Radiology 200 First Street SW Rochester MN 55905 USA;

    Mayo Clinic and Foundation Department of Radiology 200 First Street SW Rochester MN 55905 USA;

    Mayo Clinic and Foundation Department of Radiology 200 First Street SW Rochester MN 55905 USA;

    Mayo Clinic and Foundation Department of Radiology 200 First Street SW Rochester MN 55905 USA;

    Mayo Clinic and Foundation Department of Radiology 200 First Street SW Rochester MN 55905 USA;

    Mayo Clinic and Foundation Department of Radiology 200 First Street SW Rochester MN 55905 USA;

    Mayo Clinic and Foundation Department of Radiology 200 First Street SW Rochester MN 55905 USA;

    Mayo Clinic and Foundation Department of Radiology 200 First Street SW Rochester MN 55905 USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    ROC; image quality; displays; interstitial lung disease;

    机译：ROC;图像质量;显示;间质性肺疾病;

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