Improving the detection efficiency and modulation transfer function of lens-coupled indirect X-ray imaging detectors based on point spread functions simulated according to lens performance parameters

Wang, Y.; Li, G.; Zhang, J.; Yi, Q.; Zhao, Y.; Li, K.; Zhu, Y.; Jiang, X.

doi:10.1107/S1600577518007889

Journal of Synchrotron Radiation Journal of
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Figure 10
Refraction diagram of visible light between the scintillator and air. The thickness of the GGG:Tb is 20 µm, and the thickness of substrate GGG is 170 µm. The magnification of the objective is 10× (NA = 0.4). A photon from A₂ travels along A₂S and will refracted when it propagates to the interface of the scintillator with the air. The reverse extension line of the refracted light will intersect with the main optical axis at point $[{A^\prime}]$ . If the leftmost surface of the SCF is on the focal plane of the objective, the distance between point A₂ and point $[{A^\prime}]$ is about 98.40 µm. When the optical system is imaging an object at point $[{A^\prime}]$ , the PSF of $[{A^\prime}]$ will spread widely. If the SCF was moved to the left by 70 or 80 µm, $[{A^\prime}]$ will be near the focal plane of the objective, then the PSF of $[{A^\prime}]$ will be less diffuse. This is the reason why the position of the SCFs is in the negative direction of the objectives focal points when the four best-focus PSFs were obtained.

JOURNAL OF
SYNCHROTRON
RADIATION

ISSN: 1600-5775

Volume 25| Part 4| July 2018| Pages 1093-1105

https://doi.org/10.1107/S1600577518007889

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