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Multi-layer x-ray detector for diagnostic imaging



Multi-layer x-ray detector for diagnostic imaging



Official Gazette of the United States Patent & Trademark Office Patents 1269(4), Apr 22



X-rays from an x-ray tube (16) pass through an examination region (14) and are detected by a single or two-dimensional x-ray detector (20). The x-ray detector (20) includes an array (22) of photodiodes, CCD devices, or other opto-electrical transducer elements. A matching array (24) of transparent scintillator crystals, e.g., CdWO4, is supported on and optically coupled to the photoelectric transducer array. A layer (26) of a high efficiency scintillator with a good spectral match with the opto-electrical transducer array but with limited light transmissiveness is optically coupled to the transparent scintillator array. The layer (26) is preferably zinc selenide ZnSe (Te). Electrical signals from the transducer array are reconstructed (32) into an image representation and converted into a human-readable display (38). To reduce cross-talk, the zinc selenide layer is etched with pits (40), sliced into strips (26'), cut into rectangles (26"), or has channels (44) cut into it. Scatter grids (46) are advantageously received in the channels. Alternately, the zinc selenide can be powdered, encased in a transparent binder, and applied as a coating layer (26"') to the individual transparent scintillator elements.

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Accession: 035349281

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