Division of Oral Radiology, Department of Oral Diagnosis, Piracicaba Dental School, University of Campinas (UNICAMP), Piracicaba, São Paulo, Brazil.
Radiology and Imaging Sciences, Department of Diagnosis and Oral Health, University of Louisville, Louisville, KY, USA.
Dentomaxillofac Radiol. 2020 Sep 1;49(6):20190500. doi: 10.1259/dmfr.20190500. Epub 2020 Apr 29.
To assess, objectively to determine the deterioration of the photostimulable phosphor plates (PSPs) after several acquisitions.
Two new PSPs without preliminary use were exposed with an intraoral X-ray unit, and the EXPRESS (Instrumentarium Imaging, Tuusula, Finland) unit was used for scanning of the PSPs. A 12-stepwedge aluminum scale were used superimposed with the PSPs during the X-rays exposures to perform the objective analyses. Objective analysis was carried out by mean gray values using the Image J software through a region of interest (ROI) of 0.1 × 0.1 mm, and the data were analyzed statistically using ANOVA.
For each, the Express PSP a total of 1800 images were acquired during 60 days. The objective analysis showed loss of the mean gray values between the initial and final images. Besides, the percentage of mean gray values' loss was between 0.7%, for the thickest step, and 8.4%, for the lowest thickness step.
After many X-ray exposures of the Express PSP a singular deterioration in the mean gray values could be observed.
客观评估光激励磷光体板（PSP）在多次采集后的劣化情况。
将两块未经预先使用的新 PSP 置于口腔 X 射线机下曝光，使用 EXPRESS（芬兰图苏拉的Instrumentarium Imaging 公司）设备对 PSP 进行扫描。在 X 射线曝光期间，将一个 12 步楔形铝制标尺叠加在 PSP 上，以进行客观分析。使用 Image J 软件通过感兴趣区域（ROI）为 0.1×0.1mm 进行平均灰度值的客观分析，并使用方差分析进行数据统计分析。
对于每个 Express PSP，在 60 天内共采集了 1800 张图像。客观分析显示初始图像和最终图像之间的平均灰度值有所下降。此外，平均灰度值损失的百分比范围为最厚步的 0.7%，到最薄步的 8.4%。
经过多次 X 射线曝光后，Express PSP 的平均灰度值会出现单一的劣化。
