Patent ID: 8895937

Claim:
A convertor for X-ray radiography, comprising: a scintillator having an input surface facing an X-ray source and an opposite output surface facing a sensor array, the scintillator configured to convert X-ray radiation from the X-ray source into visible light having a particular frequency; and photonic crystals covering the input surface of the scintillator facing the X-ray source; wherein said photonic crystals have a two-dimensional or three-dimensional spatial structure; wherein said photonic crystals comprise a first material forming the crystal lattices defining cavities in periodic arrangement and a second material that fills the cavities defined by the crystal lattices; wherein said first material and second material have a two-dimensional or three-dimensional spatial structure and a refractive index difference between the first material and the second material meets a predefined difference value condition; wherein the positions of the cavities filled with the second material are selected to provide energy band gaps that match the particular frequency of visible light generated by the scintillator, such that the photonic crystals are configured to reflect the visible light generated by the scintillator; and wherein the positions of the cavities filled with the second material are further selected to define a reflecting direction of the visible light generated by the scintillator that is perpendicular to the input surface of the scintillator.