Method for providing image data
AssigneeSiemens Aktiengesellschaft
InventorBoris Stowasser
Life of this patent
Estimating the term…
Abstract
X-ray beam detectors in one model can individually differ from one another. This can lead to differences in the amount of noise in an image recorded with the aid of the respective X-ray beam detector. In the present case, a variable is derived using an empty image, which variable reproduces the amount of noise, and this variable then determines the type and extent of a filtering process. Hence the image processing is adapted to the respective individual noise behavior of the respective X-ray beam detector. This is particularly suitable if the X-ray beam detector is a flat-panel detector (100) with a scintillator (22) and photodetector elements (12).
Claims16
A method for providing two-dimensional image data with the aid of an X-ray image recording device, which has an X-ray beam source and an X-ray beam detector and also means for processing detector data provided by the X-ray beam detector, comprising the steps of:
- a) operating the X-ray image recording device without an image object in the X-ray image recording device in order to obtain detector data corresponding to an empty image,
- b) evaluating the detector data obtained in step a) for obtaining the value of a statistical variable that contains information relating to the amount of noise,
- c) setting the value of at least one variable for a filtering process, which at least one variable determines at least one of:
- the type and the extent of at least one of:
- a spatial and temporal filtering process as a function of the value of the statistical variable,
- d) operating the X-ray image recording device with an image object in the X-ray image recording device in order to obtain detector data corresponding to an X-ray image of the image object, and
- e) processing the detector data using at least one of a spatial and temporal filtering process determined by the at least one variable set in step c) in order to provide the two-dimensional image data.
An X-ray image recording device for providing two-dimensional image data, comprising
- an X-ray beam source, and
- an X-ray beam detector, and
- a processor operable to process detector data provided by the X-ray beam detector, wherein the X-ray image recording device is controlled
- to operate without an image object in the X-ray image recording device in order to obtain detector data corresponding to an empty image,
- to evaluate the detector data corresponding to the empty image for obtaining the value of a statistical variable that contains information relating to the amount of noise,
- to set the value of at least one variable for a filtering process, which at least one variable determines at least one of:
- the type and the extent of at least one of:
- a spatial and temporal filtering process as a function of the value of the statistical variable,
- to operate with an image object in the X-ray image recording device in order to obtain detector data corresponding to an X-ray image of the image object, and
- to process the detector data corresponding to the image object using at least one of a spatial and temporal filtering process determined by the at least one variable set in order to provide the two-dimensional image data.
A method for providing two-dimensional image data with the aid of an X-ray image recording device, comprising:
- a) receiving first image data by operating the X-ray image recording device without an image object in the X-ray image recording device,
- b) evaluating the first image data to determine a value of a statistical variable that contains information relating to the amount of noise,
- c) setting the value of at least one variable for a filtering process, which at least one variable determines at least one of:
- the type and the extent of at least one of:
- a spatial and temporal filtering process as a function of the value of the statistical variable,
- d) receiving second image data by operating the X-ray image recording device with an image object in the X-ray image recording device, and
- e) processing the second image data using at least one of a spatial and temporal filtering process determined by the at least one variable set in step c) in order to provide the two-dimensional image data.
Dependencies are inferred from the claim text.