Al Khalifah Khaled, Brindhaban Ajit, Dashti Abrar, Kandari Latifa, Kandari Abeer
Department of Radiologic Sciences, Kuwait University, PO Box 31470, Sulaibikhat 90805, Kuwait.
Alseef Hospital, Kuwait.
J Med Imaging Radiat Sci. 2012 Mar;43(1):11-15. doi: 10.1016/j.jmir.2011.07.002. Epub 2011 Sep 15.
The sensitivity of computed radiographic (CR) image plates to ionizing and/or nonionizing radiation such as light, heat, and scatter radiation have been known to cause effects such as electronic noise and to degrade image quality. The purpose of this study was to investigate the effects of image plate storage temperature on dark noise.
Image plates from Fuji and AGFA CR systems were stored at various room temperatures for 5-hour durations and then processed using the respective systems. The average pixel value in several regions of interest in the resultant images were used an indication of dark noise. The variation in the average pixel values was used to calculate image noise levels.
Image plates of the Fuji system only showed significant increase in dark noise and image noise levels when the temperature exceeded 40°C. The image plates of the AGFA system showed increases in both quantities at all temperatures.
It is recommended that storage temperatures of image plates be kept below 35°C to minimize dark noise effects.
已知计算机X线摄影（CR）成像板对电离辐射和/或非电离辐射（如光、热和散射辐射）的敏感性会导致诸如电子噪声等效应，并降低图像质量。本研究的目的是调查成像板储存温度对暗噪声的影响。
将富士和爱克发CR系统的成像板在不同室温下储存5小时，然后使用各自的系统进行处理。所得图像中几个感兴趣区域的平均像素值用作暗噪声的指标。平均像素值的变化用于计算图像噪声水平。
仅当温度超过40°C时，富士系统的成像板暗噪声和图像噪声水平才显著增加。爱克发系统的成像板在所有温度下这两个量均增加。
建议将成像板的储存温度保持在35°C以下，以尽量减少暗噪声影响。
