射线源焦点及探测器孔径大小是导致CT图象降质的主要因素。
The sizes of focal spot and detector aperture are the factors affecting ct image quality.
基于非致冷焦平面阵列探测器的热成像系统，要求光学系统具有足够大的相对孔径。
Thermal imaging systems based on uncooled focal plane array detectors require their optical lens with a large relative aperture.
基于非致冷焦平面阵列探测器的热成像系统，要求光学系统具有足够大的相对孔径。
Thermal imaging systems based on uncooled focal plane array detectors require their optical lens with a large relative aperture.
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