Stamatakis H C, Welander U, McDavid W D
Department of Oral Radiology, Karolinska Institutet, Stockholm, Sweden.
Dentomaxillofac Radiol. 1999 Sep;28(5):272-6. doi: 10.1038/sj/dmfr/4600456.
To determine the dose response function for the Digora(R) (Soredex Orion Corporation, Helsinki, Finland) storage phosphor system for intra-oral radiography.
Specially designed software provided by the manufacturer was used to register data from the pre-scanning that takes place prior to readout. These data contain information about the signal from the photomultiplier and the amplification that forms the basis for the AD conversion to 8 bit image data. Dose response functions were determined for different calibration settings and also combined into one single function.
The dose response function is linear irrespective of calibration. The gray levels of the final radiographs are directly proportional to the amplified signal. The Digora(R) does not fully compensate for exposure differences. Increased exposure results in slightly darker radiographs.
Since the gray levels of the final radiographs are directly proportional to the amplified signal, the gray levels may be used as a relative measure of the exposure in the Digora(R) system provided that they are subtracted from the maximum value of 255.
确定用于口腔内放射摄影的Digora®（芬兰赫尔辛基索雷得克斯奥里恩公司）存储磷光体系统的剂量响应函数。
使用制造商提供的专门设计的软件记录在读出之前进行的预扫描数据。这些数据包含来自光电倍增管的信号信息以及构成8位图像数据模数转换基础的放大信息。针对不同的校准设置确定剂量响应函数，并将其合并为一个单一函数。
无论校准情况如何，剂量响应函数都是线性的。最终射线照片的灰度级与放大信号成正比。Digora®不能完全补偿曝光差异。曝光增加会导致射线照片略暗。
由于最终射线照片的灰度级与放大信号成正比，只要从255的最大值中减去这些灰度级，就可以将其用作Digora®系统中曝光的相对度量。
