存储磷光体与胶片射线照相术对X射线曝光微小变化的响应比较。
A comparison of the response of storage phosphor and film radiography to small variations in X-ray exposure.
作者信息
Hildebolt C F, Fletcher G, Yokoyama-Crothers N, Conover G L, Vannier M W
机构信息
Mallinckrodt Institute of Radiology, Washington University, St Louis, MO 63110, USA.
出版信息
Dentomaxillofac Radiol. 1997 May;26(3):147-51. doi: 10.1038/sj.dmfr.4600227.
OBJECTIVES
To determine the response to small repeated variations in X-ray exposure of storage phosphor (SP) plates compared with Ektaspeed Plus dental film.
METHODS
Exposure of SP plates and Ektaspeed Plus dental film was varied within a small range [8.62 microC kg-1 to 9.03 microC kg-1, (5%)]. Radiographs were digitized and SP plates read with a laser-based scanner. Nested analysis of variance, analysis of covariance, and regression analysis were used to test the relationship between exposure and the resulting signal.
RESULTS
The relationship between exposure and signal for digital images of film radiographs was not significant whereas the corresponding relationship for SP images was highly significant (P < 0.001, R2 = 0.44).
CONCLUSIONS
Over the narrow range of X-ray exposures studied there was a significant direct linear relationship between exposure and digital gray-scale values for SP images but not for digital images of Ektaspeed Plus films.
目的
与Ektaspeed Plus牙科胶片相比，确定存储磷光体（SP）板对小剂量重复X射线曝光的反应。
方法
SP板和Ektaspeed Plus牙科胶片的曝光在小范围内变化[8.62微库仑/千克至9.03微库仑/千克，（5%）]。射线照片被数字化，SP板用基于激光的扫描仪读取。使用嵌套方差分析、协方差分析和回归分析来测试曝光与所得信号之间的关系。
结果
胶片射线照片数字图像的曝光与信号之间的关系不显著，而SP图像的相应关系高度显著（P < 0.001，R2 = 0.44）。
结论
在所研究的X射线曝光窄范围内，SP图像的曝光与数字灰度值之间存在显著的直接线性关系，而Ektaspeed Plus胶片的数字图像则不存在这种关系。
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