X-ray detector having an entrance section including a low energy x-ray filter preceding a conversion layer
AssigneeU.S. Philips Corporation
InventorsJohannes K. E. Colditz, Pieter J. t Hoen
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Abstract
An X-ray image intensifier tube (1) includes an entrance section (2) for converting high-energy X-rays of from 100 keV to 120 keV into an electron beam (10). The entrance section (2) had a conversion layer (3) with a filter layer (5) for absorbing a part of comparatively low energy (from 60 keV to 80 keV) of the X-rays and a conversion layer for converting the high-energy X-rays of approximately from 100 keV to 120 keV into radiation whereto the photocathode is sensitive.
Claims6
An X-ray detector comprising a conversion layer for converting incident X-rays into low-energy radiation, and an X-ray filter for shielding the conversion layer from X-rays of an energy below a threshold value of approximately 100 keV.
An X-ray image intensifier tube comprising an entrance section for converting an X-ray beam into an electron beam, a photocathode, and a conversion layer for converting incident X-rays into low-energy radiation whereto the photocathode is sensitive, characterized in that the entrance section comprises a filter layer for shielding the conversion layer from X-rays of an energy below a threshold value of approximately 100 keV, and that the conversion layer is situated between the photocathode and the filter layer.
Dependencies are inferred from the claim text.