X-ray imaging method, x-ray imaging system, and computer program product

The X-ray imaging method as claimed in one of the preceding claims, wherein

• during a first mask acquisition phase (M1), a first mask sequence of projection images is produced, wherein each projection image in the first mask sequence at least partially represents the at least one hollow organ (7) under a different projection direction in each case;
• each projection image in the first mask sequence is associated with exactly one projection image in the first sequence, so that the projection direction of the projection image in the first mask sequence is the same as the projection direction of the associated projection image in the first sequence;
• for each projection image in the first mask sequence a first subtraction image is produced by subtracting the projection image in the first mask sequence from the associated projection image in the first sequence;
• and
• the time-resolved three-dimensional reconstruction is produced on the basis of the first subtraction images.

The X-ray imaging method as claimed in one of the preceding claims, wherein

• during a second acquisition phase (A2), a second sequence of projection images is produced, wherein each projection image in the second sequence at least partially represents the at least one hollow organ (7) under a different respectively defined projection direction;
• the second acquisition phase (A2) begins at the time the first acquisition phase (A1) ends;
• and
• the time-resolved three-dimensional reconstruction is produced on the basis of the projection images in the second sequence.

An X-ray imaging system (1) for time-resolved three-dimensional representation of at least one hollow organ (7) of a person (6), which X-ray imaging system (1) has an X-ray source (2), an X-ray detector (3), a drive mechanism for positioning the X-ray source (2) and the X-ray detector (3) with respect to an acquisition region according to different projection directions, and at least one computing unit (4), which is configured

• to obtain a first time length (T1), which corresponds to a person-specific time length for a contrast agent to flow from a defined contrast-agent injection location for the person (6) to a defined proximal location (8) of the at least one hollow organ (7);
• to obtain a second time length (T2), which corresponds to a person-specific time length for the contrast agent to flow from the proximal location (8) to a defined distal location (9) of the at least one hollow organ (7);
• to control the drive mechanism, the X-ray source (2) and the X-ray detector (3) to produce during a first acquisition phase (A1) a first sequence of projection images, wherein each projection image in the first sequence at least partially represents the at least one hollow organ (7) under a different respectively defined projection direction, wherein the first acquisition phase (A1) begins the first time length (T1) after an injection start time for injecting the contrast agent at the contrast-agent injection location, and a duration of the first acquisition phase (A1) equals the second time length (T2);
• and
• to produce a time-resolved three-dimensional reconstruction of the at least one hollow organ (7) on the basis of the projection images in the first sequence.