Scatter correction method for non-stationary X-ray acquisitions

A method of estimating scatter in an X-ray image, where radiation emitted from an X-ray source is transmitted through an imaged object and is incident on the X-ray detector at an acute angle, comprising:

• explicitly modeling the effect of angular incidence of X-ray radiation in a scatter signal;
• and
• calculating, via convolution, an estimate of the scatter signal in an X-ray image.

A method of estimating an asymmetrical scatter kernel wherein asymmetry is introduced by angular incidence of radiation, which has been emitted from a source and transmitted through an object to be imaged, on a detector, comprising:

• modifying scatter that would be derived wherein the radiation is directly incident on the detector with zero degrees of inclination, using an asymmetry factor which indicates the shape and magnitude of the scatter kernel and which varies with an angle at which the radiation is incident on the detector, a mean attenuation coefficient of the object, and a distance the radiation has traveled through the object.

A computer readable medium encoded with a program executable by a computer for estimating scatter in an image wherein radiation from a radiation source is transmitted through an object to be imaged and is incident on a detector at an inclined angle, said program being configured to instruct the computer to

• explicitly model an effect of angular incidence of the radiation on a scatter signal, including deriving, using an empirically based correction which includes the effect of an angle of incidence of the radiation on the detector, an estimate of the scatter signal in image data derived from the incident radiation on the detector.

A computer readable medium encoded with a program executable by a computer for estimating scatter in an image wherein radiation from a radiation source is transmitted through an object to be imaged and is incident on a detector at an inclined angle, said program being configured to instruct the computer to:

• explicitly model the effect of angular incidence of X-ray radiation in a scatter signal;
• and
• calculate, via convolution, an estimate of the scatter signal in an X-ray image.

A computer readable medium encoded with a program executable by a computer for estimating scatter in an image wherein radiation from a radiation source is transmitted through an object to be imaged and is incident on a detector at an inclined angle, said program being configured to instruct the computer to modify scatter that would be derived wherein the radiation is directly incident on the detector with zero degrees of inclination, using an asymmetry factor which indicates the shape and magnitude of the scatter kernel and which varies with an angle at which the radiation is incident on the detector, a mean attenuation coefficient of the object, and a distance the radiation has traveled through the object.

An imaging system comprising:

• a radiation source and a detector array, wherein the radiation source and the detector array are movable relative to one another;
• a computer coupled to the detector array and the radiation source and configured to estimate scatter in an image wherein radiation from a radiation source is transmitted through an object to be imaged and is incident on a detector at an inclined angle, by explicitly modeling an effect of angular incidence of the radiation on a scatter signal, including deriving, using an empirically based correction which includes the effect of an angle of incidence of the radiation on the detector, an estimate of the scatter signal in image data derived from the incident radiation on the detector.

An imaging system for estimating scatter in an image wherein radiation from a radiation source is transmitted through an object to be imaged and is incident on a detector at an inclined angle, said system including a computer configured to:

• explicitly model the effect of angular incidence of X-ray radiation in a scatter signal;
• and
• calculate, via convolution, an estimate of the scatter signal in an X-ray image.

An imaging system for correcting asymmetrical scatter in an image wherein radiation from a radiation source is transmitted through an object to be imaged and is incident on a detector at an inclined angle, said system including a computer configured to:

• to modify scatter that would be derived wherein the radiation is directly incident on the detector with zero degrees of inclination, using an asymmetry factor which indicates the shape and magnitude of the scatter kernel and which varies with an angle at which the radiation is incident on the detector, a mean attenuation coefficient of the object, and a distance the radiation has traveled through the object.