US 12,002,130 B2
Method for artifact correction during a reconstruction of at least one slice image from a plurality of projection images
Bernd Schreiber, Forchheim (DE)
Assigned to Siemens Healthineers AG, Forchheim (DE)
Filed by Siemens Healthcare GmbH, Erlangen (DE)
Filed on Aug. 25, 2021, as Appl. No. 17/411,314.
Claims priority of application No. 10 2020 210 958.3 (DE), filed on Aug. 31, 2020.
Prior Publication US 2022/0067988 A1, Mar. 3, 2022
Int. Cl. G06T 11/00 (2006.01); G06T 7/00 (2017.01)
CPC G06T 11/008 (2013.01) [G06T 7/0012 (2013.01); G06T 11/005 (2013.01); G06T 2207/10081 (2013.01); G06T 2207/30008 (2013.01); G06T 2210/41 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A computer-implemented method for artifact correction during a reconstruction of at least one slice image from a plurality of projection images, the method comprising:
providing the plurality of projection images, each projection image of the plurality of projection images including a plurality of pixels and each pixel of the plurality of pixels including a pixel value;
determining a plurality of corrected projection images based on the plurality of projection images via a computing circuit;
reconstructing the at least one slice image based on the plurality of corrected projection images; and
providing the at least one slice image,
wherein the determining of the plurality of corrected projection images, for each respective projection image of the plurality of projection images, comprises:
determining an average pixel value in at least one subarea of the respective projection image,
determining a respective correction value by multiplying the average pixel value by a scatter factor, and
determining a plurality of corrected pixel values by
subtracting the respective correction value from the plurality of pixel values of the respective projection image, and
for each respective corrected pixel value
checking whether the respective corrected pixel value is below a minimum threshold, and
replacing the respective corrected pixel value by the minimum value in response to the corrected pixel value falling below the minimum value,
wherein a respective corrected projection image of the plurality of corrected projection images includes a plurality of pixels including the plurality of corrected pixel values.