Method for providing a 3D X-ray image dataset of a patient's heart

An X-ray device for generating a 3D X-ray image dataset of a heart of a patient, comprising:

• an X-ray source that emits X-rays to the patient;
• an X-ray detector that records a sequence of 2D X-ray images of the heart with heartbeat phases at image recording instants being measured and assigned to the images;
• and
• a computing device that:
• divides a range of the heartbeat phases into a plurality of intervals,
• generates a plurality of 3D image datasets, each 3D image dataset being generated from the 2D X-ray images assigned to a heartbeat phrase from a respective interval,
• assigns each 3D image dataset to the heartbeat phase from the respective interval,
• chooses one of the 3D image datasets as a reference image dataset,
• calculates movement fields of remaining 3D image datasets relative to the reference image dataset,
• selects a heartbeat phase from the heartbeat phases,
• picks a 2D X-ray image assigned to the selected heartbeat phase,
• generates a second 3D image dataset from the picked 2D X-ray image,
• determines a position of the selected heartbeat phase relative to the heartbeat phases,
• calculates an interpolated movement field for the second 3D image dataset relative to the reference image dataset based on the movement fields and the position, and
• deforms the second 3D image dataset using the interpolated movement field to generate the 3D X-ray image dataset.