US 8,542,795 B2 · Method for obtaining high-contrast X-ray images and X-ray beam detector

Abstract

An X-ray radiation detector (100) consists of an arrangement with photodetector elements (12) and a scintillator layer (14) on the same. It is assumed in an exemplary fashion that the scintillator layer (14) subjects an input signal, which describes an object to be imaged, to a convolution with a modulation transfer function. The effect of this can be cancelled, particularly by obtaining a test X-ray image in advance, with the aid of which this modulation transfer function, or a similar variable providing information on the modulation transfer function, is established. If use is made of photodetectors that are based on CMOS technology, use can be made of a particularly thick scintillator layer made of gadolinium oxysulfide, which absorbs a particularly large amount of X-ray radiation. High-contrast X-ray images are obtained in this fashion.

Claims16

Dependent claims

A method for obtaining high-contrast X-ray images with the aid of an X-ray beam detector, which has an arrangement of light-sensitive detector elements beneath a scintillator layer, wherein each detector element provides a grayscale value in a pixel arrangement for defining an X-ray image, comprising the following steps:

obtaining a test X-ray image of a predetermined object with the aid of the X-ray beam detector,
deriving at least one mathematical variable or at least one function of a variable from the test X-ray image, which variable, under the assumption that the generation and scattering of light in the scintillator layer is understood as a convolution of an input signal of the incident X-ray radiation with a transfer function, provides information relating to the transfer function,
obtaining a raw X-ray image of an object to be imaged with the aid of the X-ray beam detector, and
processing the raw X-ray image using the at least one variable or the at least one function in order to remove, at least in part, an effect on the image contrast by the light propagation within the scintillator layer.

1 more element

A system for obtaining high-contrast X-ray images with the aid of an X-ray beam detector, which has an arrangement of light-sensitive detector elements beneath a scintillator layer, wherein each detector element provides a grayscale value in a pixel arrangement for defining an X-ray image, wherein the system is configured:

to obtain a test X-ray image of a predetermined object with the aid of the X-ray beam detector,
to derive at least one mathematical variable or at least one function of a variable from the test X-ray image, which variable, under the assumption that the generation and scattering of light in the scintillator layer is understood as a convolution of an input signal of the incident X-ray radiation with a transfer function, provides information relating to the transfer function,
to obtain a raw X-ray image of an object to be imaged with the aid of the X-ray beam detector, and
to process the raw X-ray image using the at least one variable or the at least one function in order to remove, at least in part, an effect on the image contrast by the light propagation within the scintillator layer.

1 more element

Dependencies are inferred from the claim text.

Method for obtaining high-contrast X-ray images and X-ray beam detector

Life of this patent

Method for obtaining high-contrast X-ray images and X-ray beam detector

Life of this patent

Abstract

Claims16