Olgar T, Kamberli E
Department of Engineering Physics, Faculty of Engineering, Ankara University, 06100 Tandoğan, Ankara, Turkey.
Australas Phys Eng Sci Med. 2013 Jun;36(2):231-41. doi: 10.1007/s13246-013-0203-3. Epub 2013 Jun 1.
The purpose of this study was to evaluate the display performance of the liquid crystal display monitors according to the American association of physicists in medicine task group 18 (AAPM TG18) protocol at prior and after new calibration. We measured minimum and maximum luminance, luminance ratio, luminance and contrast response, luminance angular and spatial dependency, resolution, veiling glare and chromaticity quantitatively for 33 medical displays. Display noise was evaluated only visually. The mean maximum luminance and luminance ratio were 386 and 273 cd m(-2), respectively. The mean deviation of measured luminance and contrast response from expected response associated with the digital imaging and communications in medicine (DICOM) grayscale standard display function (GSDF) were 9.76 and 2.35 % at prior calibration and 1.23 and 0.26 % after recalibration, respectively. In luminance uniformity test the mean maximum luminance deviation was 16 %. Luminance method was used in the spatial resolution test and the mean percent luminance difference was 12 % at the center. The mean glare ratio was 1 154. The average color uniformity parameter across the display area of each display device was 0.0093. Majority of the test results were in good agreement with the criteria recommended by AAPM TG18 report. Considerable improvement was observed in display luminance and contrast response with respect to expected response of DICOM GSDF after new calibration for some displays.
本研究的目的是根据美国医学物理师协会任务组18（AAPM TG18）协议，评估新型校准前后液晶显示器的显示性能。我们对33台医用显示器的最小和最大亮度、亮度比、亮度和对比度响应、亮度角度和空间依赖性、分辨率、遮蔽眩光和色度进行了定量测量。仅通过视觉评估显示噪声。平均最大亮度和亮度比分别为386和273 cd m(-2)。在校准前，测量的亮度和对比度响应与医学数字成像和通信（DICOM）灰度标准显示功能（GSDF）预期响应的平均偏差分别为9.76%和2.35%，重新校准后分别为1.23%和0.26%。在亮度均匀性测试中，平均最大亮度偏差为16%。空间分辨率测试采用亮度法，中心位置的平均亮度百分比差异为12%。平均眩光比为1 154。每个显示设备显示区域的平均颜色均匀性参数为0.0093。大多数测试结果与AAPM TG18报告推荐的标准高度一致。对于一些显示器，在新型校准后，观察到显示亮度和对比度响应相对于DICOM GSDF预期响应有显著改善。
