Computer-implemented method for adjusting the noise of an x-ray image, x-ray facility, computer program and electronically-readable data medium

An x-ray facility comprising:

• an x-ray emitter;
• an x-ray detector;
• and
• a control facility configured to:
• assign image values measured according to an incident x-ray dose,
• wherein the image values of an x-ray image comprise a first detector noise component arising from detector-internal noise of the x-ray detector and a second dose-dependent signal component comprising quantum noise arising from an x-ray imaging using the x-ray emitter and the x-ray detector,
• wherein a local, dose-dependent filter adjusting a correlation between image points, evaluating a subarea of the x-ray image around an image point currently being processed is applied to the image values of all of the image points of the x-ray image, which brings about a change of at least one part of initial statistics of image values of the subareas to a common target statistics of all subareas,
• wherein the local, dose-dependent filter is established from a transformation of the image values of an environment extending around a respective image point, comprising the respective image point, and
• wherein, by the transformation, a covariance matrix of the initial statistics is adjusted to a target covariance matrix of target statistics.

A non-transitory computer readable medium comprising a computer program, which, when executed on a control facility of an x-ray facility, is configured to cause the x-ray facility to:

• assign image values measured according to an incident x-ray dose,
• wherein the image values of an x-ray image comprise a first detector noise component arising from detector-internal noise and a second dose-dependent signal component comprising quantum noise arising from an x-ray imaging,
• wherein a local, dose-dependent filter adjusting a correlation between image points, evaluating a subarea of the x-ray image around an image point currently being processed is applied to the image values of all of the image points of the x-ray image, which brings about a change of at least one part of initial statistics of image values of the subareas to a common target statistics of all subareas,
• wherein the local, dose-dependent filter is established from a transformation of the image values of an environment extending around a respective image point, comprising the respective image point, and
• wherein, by the transformation, a covariance matrix of the initial statistics is adjusted to a target covariance matrix of target statistics.