Agfa Healthcare Nv

Agfa Nv

Agfa-gevaert

Agfa Gevaert Nv

Afga Healthcare Nv

Agfa Healthcare

Marc Cresens

Herman Van Goubergen

Walter Exelmans

Peter M Willems

Stefan Stommels

The invention is related to a method for automatic selection and pre-processing of digital images that comprise the necessary amount of Transfer function modulated quantum-noise to apply a mathematical sharpness calculation method for calculation of a sharpness parameter of the digital imaging system. Suitable images for the method are selected from the pool of available images acquired by the digital imaging system during daily operation.

Method and system to characterize and monitor the sharpness of a digital imaging system

This invention is related to a method to measure and calculate a point spread function PSF of an image detector system based on the analysis of quantum noise that is present in generic image acquisition data, and that is modulated by the transfer function of the digital imaging system. The method allows the calculation of the sharpness of a system without the need for image phantom recordings.

Method and system to calculate the point spread function of a digital image detector system based on a MTF modulated quantum-noise measurement

A method for removing defective pixel image-artifacts includes an adaptive reconstruction kernel taking up to four main and diagonal, defect-free sub-kernel directions into account composed for each defective image pixel. The defective pixels impacted image is real-time corrected by statistical filtering or by a weighed directional convolution of kernel-associated replacement values, calculated by means of an advanced multi-parabolic reconstruction algorithm, for each contributing sub-kernel direction based on 5&#xd7;5 pixels neighborhood image data readily accessible via a predetermined AMP kernels image-offsets structure.

Method for reducing image disturbances caused by reconstructed defective pixels in direct radiography

A method for reshaping the characteristic exposure response and dosimetry of a direct radiography system into a specified exposure response profile includes pixel-wise converting image data according to a response transfer model which is derived from an x-ray generator's post exposure parameters data associated with image signals obtained at various exposure levels during system calibration and from a few extra dose measurements and their corresponding post exposure data also gathered during system calibration under reference exposure conditions.

Method for reshaping the characteristic exposure response and dosimetry of a direct radiography system

A method for reducing image disturbances caused by reconstructed defective pixel clusters located in signal-gradient affected diagnostic image regions. An individually adapted central symmetrical pair reconstruction (CSP) kernel is composed for a defective image pixel based on a kernel-pair candidate order encoded in a model thereby using the pixel's validity state. The image impacted by defective pixels is corrected in real-time by statistical filtering or spatial convolution of the kernel-associated image data accessible via a predetermined CSP kernels image-offsets structure.

Method for correcting defective pixel artifacts in a direct radiography image

A statistical analysis is performed on pixel values of at least one region of interest in an image obtained by substantially uniform irradiation of an x-ray detector and deciding upon the presence of a source of x-ray beam in-homogeneity by comparing the results of the statistical analysis with at least one predetermined acceptance criterion.

Method to evaluate the presence of a source of x-ray beam inhomogeneity during x-ray exposure

Method and system for determining the spatial response signature of a x-ray detector comprising a photostimulable phosphor by generating a flat field image of the detector, generating a low-pass filtered version of the flat field image and background demodulating the flat field image by pixel-wise dividing it by means of corresponding pixel values in the low-pass filtered version.

Method of determining spatial response signature of detector in computed radiography

Method of removing the spatial response signature of a detector from a computed radiography image by adaptively filtering and spatially warping the characteristic response signature of the detector prior to demodulation.

Method of removing spatial response signature of computed radiography dector from image

A method for canceling the impact of the physical property variability on the image quality performance of a digital imaging system, obtained during quality control (QC) analysis using a serial numbered quality control (QC) target by applying physical property deviation controlled behavior model corrections to the raw image quality performance. The serial numbered QC-target used for the QC analysis comprises target-specific, measured physical property data encoded in- or outside of QC-target.

Method for canceling impact of physical property variability on image quality performance of digital imaging system

A method for neutralizing the non-noise correlated, multiplicative image-artifacts introduced by the X-ray exposure, the detector or the digitizer prior to the determination of the Signal-to-Noise Ratio or the (Normalized) Noise Power Spectrum in CR/DR radiography systems. This method uses statistical techniques and the photon-noise physical model to correct the raw, digital image-data obtained in the selected region of interest (roi) for evaluation during quality control (QC).

Method for neutralizing image artifacts prior to determination of signal-to-noise ratio in CR/DR radiography systems

An apparatus and method for an X-ray dosimeter support, comprises of a material-poor support-layer, held by a frame elevated by at least one foot, comprising optimization for low back-scatter, high measurement-repeatability and ease of assembly and disassembly.

Scatter-poor dosimeter support device and method of operation

A method for generating an output image by reducing the size of an input image by determining for a pixel location (i,j) in the output image a corresponding areaxy in the input image, fetching the input image areaxy pixel values, calculating an output pixel value Dij for the pixel location (i,j) using a size reducing algorithm, inserting Dij in the output image and repeating the previous steps for each pixel location (i,j) in the output image. The value Di,j is obtained by adding to the lower resolution background representation A of the input image area pixel values with a value obtained by amplifying MED, representing the pixel value in the input image area that most deviates from said lower resolution background representation A, by means of a significance factor SF.

Method for visual inspection of size-reduced digital image

Each of the detectors of a detector inventory are subjected to an identical flat field exposure to generate a radiation mage in each of the detectors, from the radiation images the overall field distribution is determined and neutralized in the images, next the sensitivity is determined.

Method of determining sensitivity of radiation detector

Each of the detectors of the inventory are subjected to an identical flat field exposure to generate a radiation mage in each of the detectors, from the radiation images the overall field distribution is determined and neutralized in the images, next the non-uniformity is calculated.

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Diest, Belgium

Marc Cresens