Martins M G B Q, Haiter Neto F, Whaites E J
Department of Dental Radiology, Piracicaba Dentistry School, University of Campinas, Areião, Piracicaba-SP, Brazil.
Dentomaxillofac Radiol. 2003 May;32(3):186-90. doi: 10.1259/dmfr/24355220.
To assess, both objectively and subjectively, the effects of different combinations of storage conditions and varying delays in reading on digital images captured using phosphor storage plates (PSPs).
Standardized images were obtained of an aluminium step wedge and a dry mandible in acrylic using GE 1000 and PSPs from the Digora (Soredex) and DenOptix (Gendex) digital systems. Twelve plates from each system 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 6 h, 12 h, 18 h, 24 h, 48 h or 72 h. Objective analysis was carried out by pixel density measurements and the data were analysed statistically using analysis of variance. Subjective analysis was carried by three oral radiologists and the results were analysed using Mann-Whitney U-test.
For the DenOptix system there were no differences either objectively or subjectively in the images obtained from all the plates using different storage conditions and after varying time intervals. For Digora, objective analysis showed loss of pixel density after 6 h using all storage conditions. This loss of density was also evident subjectively after 6 h on plates stored under certain storage conditions.
Storage of DenOptix PSPs for up to 72 h in different conditions does not affect the quality of the digital images. However, there is a loss of image density within 6 h when using Digora PSPs, which may affect clinical image interpretation.
客观和主观地评估存储条件的不同组合以及阅片时间的不同延迟对使用磷光存储板（PSP）采集的数字图像的影响。
使用GE 1000以及Digora（Soredex）和DenOptix（Gendex）数字系统的PSP，获取铝阶梯楔形块和丙烯酸树脂干下颌骨的标准化图像。每个系统的12块板进行曝光并立即扫描以生成基线金标准。这些板再次曝光后，采用三种不同的存储组合进行存储，（A）室温、（R）冷藏和（S）低湿度，然后在6小时、12小时、18小时、24小时、48小时或72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，结果采用曼-惠特尼U检验进行分析。
对于DenOptix系统，在使用不同存储条件并经过不同时间间隔后，从所有板获得的图像在客观和主观上均无差异。对于Digora系统，客观分析显示在使用所有存储条件下6小时后像素密度下降。在某些存储条件下存储的板在6小时后主观上也明显出现这种密度下降。
DenOptix PSP在不同条件下存储长达72小时不会影响数字图像的质量。然而，使用Digora PSP时在6小时内图像密度会下降，这可能会影响临床图像解读。
