Martins M G B Q, Whaites E J, Ambrosano G M B, Haiter Neto F
Faculdade de Odontologia de Piracicaba--FOP/UNICAMP, Disciplina de Radiologia Odontológica, Av. Limeira, 901, Areião, Piracicaba--SP Brazil, CEP 13414-903.
Dentomaxillofac Radiol. 2006 May;35(3):143-6. doi: 10.1259/dmfr/29710762.
To assess, both objectively and subjectively, the effects of different combinations of storage conditions and delaying scanning for up to 4 h on digital images captured using Digora phosphor storage plates (PSPs).
Standardized images were obtained of an aluminium step wedge and dry mandible in acrylic using GE 1000 and phosphor storage plates (PSPs) from the Digora (Soredex) digital system. 12 plates were exposed and immediately scanned to produce the baseline gold standard. The plates were re-exposed and stored using three different storage combinations--(A) ambient temperature, (R) refrigeration and (S) low humidity, and then scanned after 10 min, 30 min, 1 h, 2 h, 3 h or 4 h. The objective analysis was carried out by pixel density measurements and the data analysed statistically using analysis of variance. Subjective analysis was carried out by three oral radiologists and the results analysed using the Mann Whitney U-test.
Objective analysis showed loss of pixel density after 4 h using all storage combinations. Subjectively, this loss of density was not evident.
There is a loss of image density at 4 h when using Digora PSPs which can not be detected clinically, but could compromise multisite research.
客观和主观地评估存储条件的不同组合以及长达4小时的扫描延迟对使用Digora磷光存储板（PSP）捕获的数字图像的影响。
使用GE 1000和Digora（Soredex）数字系统的磷光存储板（PSP），获得丙烯酸树脂中铝阶梯楔形物和干燥下颌骨的标准化图像。曝光12块板并立即扫描以产生基线金标准。对这些板进行重新曝光，并使用三种不同的存储组合进行存储 - （A）环境温度，（R）冷藏和（S）低湿度，然后在10分钟、30分钟、1小时、2小时、3小时或4小时后进行扫描。通过像素密度测量进行客观分析，并使用方差分析对数据进行统计学分析。主观分析由三名口腔放射科医生进行，结果使用曼-惠特尼U检验进行分析。
客观分析表明，使用所有存储组合在4小时后像素密度都会降低。主观上，这种密度降低并不明显。
使用Digora PSP时，4小时会出现图像密度降低的情况，这在临床上无法检测到，但可能会影响多部位研究。
