3d dsa image reconstruction

A method for reconstructing DSA images representing a region of interest in an object, the method comprising:

• receiving cone beam projection data acquired during a portion of a revolution of a source-detector arrangement of a cone beam X-ray imaging system around the object, the portion of the revolution comprising a first angular range including one or more orientations of the source-detector arrangement prior to a contrast agent entering the region of interest and/or subsequent to the contrast leaving the region of interest, and a second angular range including one or more orientations of the source-detector arrangement whilst the contrast agent flows within the region of interest;
• reconstructing the cone beam projection data acquired from the one or more orientations within the first angular range, into a 3D mask image representing the region of interest;
• and
• reconstructing the cone beam projection data acquired from the one or more orientations within the second angular range, into a temporal sequence of 3D DSA images representing the region of interest, based on the reconstructed 3D mask image.

A non-transitory computer-readable storage medium having stored a computer program comprising instructions which, when executed by a processor, cause the processor to:

• receive cone beam projection data acquired during a portion of a revolution of a source-detector arrangement of a cone beam X-ray imaging system around the object, the portion of the revolution comprising a first angular range including one or more orientations of the source-detector arrangement prior to a contrast agent entering the region of interest and/or subsequent to the contrast leaving the region of interest, and a second angular range including one or more orientations of the source-detector arrangement whilst the contrast agent flows within the region of interest;
• reconstruct the cone beam projection data acquired from the one or more orientations within the first angular range, into a 3D mask image representing the region of interest;
• and
• reconstruct the cone beam projection data acquired from the one or more orientations within the second angular range, into a temporal sequence of 3D DSA images representing the region of interest, based on the reconstructed 3D mask image.