Detective quantum efficiency of x-ray image intensifiers: comparison of scintillation spectrum and rms methods.
Detective quantum efficiency of x-ray image intensifiers: comparison of scintillation spectrum and rms methods.
复制标题
X 射线图像增强器的检测量子效率：闪烁光谱和 rms 方法的比较。
DOI：
10.1118/1.595556
复制
发表时间：
1984
期刊：
影响因子：
3.8
通讯作者：
K. W. Taylor
中科院分区：
文献类型：
--
作者：
J. Rowlands;K. W. Taylor
For monoenergetic x rays, the detective quantum efficiency (DQE) of an x-ray image intensifier (XRII) obtained by measuring the ratio of signal to root-mean-square (rms) noise is compared with the DQE obtained by the scintillation spectrum method. To obtain agreement between the two methods, the rms noise must be measured at a very low frequency because of the temporal response RXRII (f) of the XRII. This takes a long time and the measurement of the DQE from the scintillation spectrum is much quicker. Measurement of RXRII (f) shows that it is dependent on x-ray flux rate. RXRII (f) measured at the same flux rate as DQE permits correction of DQE measurements to zero frequency. In order to estimate DQE for polyenergetic beams, we need to know as a function of energy not only the DQE but the amount of energy deposited per absorbed x ray. The latter is also obtained from the rms measurement.
