Dual-screen digital radiographic imaging detector array

Abstract

A radiographic imaging device has a first scintillating phosphor screen having a first thickness and a second scintillating phosphor screen having a second thickness. A transparent substrate is disposed between the first and second screens. An imaging array formed on a side of the substrate includes multiple photosensors and an array of readout elements.

Description

technical field [0001] The present invention relates generally to digital radiography and, more particularly, to the use of dual, asymmetric phosphor screens in digital radiography flat panel imaging detector arrays to improve image quality. Background technique [0002] Typically, medical X-ray detectors that employ scintillation phosphor screens to absorb X-rays and generate light suffer from a loss of spatial resolution due to the lateral light diffusion of the screen. In order to reduce lateral light diffusion and maintain acceptable spatial resolution, the phosphor screen must be made sufficiently thin. The spatial resolution and X-ray detection capabilities of imaging devices are often characterized by the modulation transfer function (MTF) and X-ray absorption efficiency, respectively. Thin phosphor screens yield better MTF at the expense of reduced X-ray absorption. Typically, the coating density and thickness of the phosphor screen are designed as a compromise bet...

AI Technical Summary

Problems solved by technology

[0002] Typically, medical X-ray detectors that employ scintillation phosphor screens to absorb X-rays and generate light suffer from a loss of spatial resolution due to the lateral light diffusion of the screen

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