Count uniformity correction in flux space for pixilated semiconducting radiation detectors
AssigneeII-VI Incorporated
InventorDerek S. Bale
Life of this patent
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Abstract
In operation of a photon counting detecting system (10), a number of pulse counts output by least one pixel (20) of a photon counting detector in response to experiencing a photon flux density during a sample interval is acquired and a photon flux density (46) or value related thereto corresponding to the pulse counts output by the pixel (20) is determined. A correction (48) for the thus determined photon flux density (46) or value related thereto is determined. A corrected number of pulse counts (52) is determined for the pixel (20) as a function of the thus determined corrected photon flux density value or value related thereto. An image can be displayed that is a function of the corrected number of pulse counts for pixels of the system.
Claims23
A photon counting detecting system operating method comprising:
- (a) electronically storing for each of a plurality of pixels of a photon counting detector a plot of pulse counts output by the pixel over a range of corresponding photon flux densities;
- (b) electronically storing a plot, determined from the plots of step (a), of an intermediate number of pulse counts output by all of the pixels over the range of photon flux densities;
- (c) electronically acquiring for one pixel of the photon counting detector a number of pulse counts output by the pixel in response to photons striking the pixel during a sample interval;
- (d) electronically determining a photon flux density corresponding to the pulse counts output by the pixel in step (c) from the corresponding plot of step (a);
- (e) electronically correcting the value of the photon flux density determined in step (d) as a function of parameters of a curve fitting function that approximates the plot of step (b) and as a function of other parameters of the curve fitting function that separately approximates the plot of step (a) for the pixel of step (c);
- and
- (f) electronically determining from the corrected photon flux density value a corrected number of pulse counts for the pixel.
A photon counting detecting system comprising:
- a photon counting detector including a plurality of pixels;
- an electronic storage which:
- stores a plot for each pixel of pulse counts output by the pixel versus values related to photon flux densities striking the pixel;
- and
- stores a plot of an intermediate number of pulse counts output by all of the pixels versus values related to the photon flux densities;
- means for electronically acquiring a number of pulse counts output by each pixel in response to photons striking the pixel during a sample interval;
- and
- a controller programmed to:
- determine a value related to a photon flux density corresponding to the acquired number of pulse counts output by the pixel from the plot thereof,
- determine a corrected value related to the photon flux density for the pixel as a function of (a) the value related to the photon flux density determined by the controller, (b) the plot for the pixel, and (c) the plot of the intermediate number of pulse counts output by all of the pixels versus the values related to the photon flux densities, and
- determine from the corrected value related to the photon flux density a corrected number of pulse counts for the pixel.
A photon counting detecting system operating method comprising:
- (a) acquiring for at least one pixel of a photon counting detector a number of pulse counts output by the pixel in response to experiencing photon flux during a sample interval;
- (b) determining a value related to the photon flux density or a value related thereto corresponding to the pulse counts output by the pixel;
- (c) determining a correction for the value of photon flux density or a value related thereto determined in step (b) as a function of an approximation of the response of the pixel to a range of flux densities or values related thereto and an approximation of an average response of all the pixels to the range of flux densities or values related thereto;
- and
- (d) determining a corrected number of pulse counts for the pixel as a function of the corrected photon flux density value determined in step (c) or the corrected value related thereto.
Dependencies are inferred from the claim text.