Trajectory of a c-arm of a c-arm system

A control facility comprising:

• a starting unit configured to:
• control a start position of a C-arm in a forward leg of a rotation of the C-arm with a lateral offset that has a first offset value;
• start the forward leg at the start position of the forward leg;
• and
• start a return leg of a rotation of the C-arm at an end position of the forward leg;
• and
• a rotation unit configured to:
• rotate the C-arm in the forward leg in a forward direction as far as the end position of the forward leg, wherein the lateral offset is reduced to a value of 0;
• and
• rotate the C-arm in the return leg in a return direction as far as an end position of the return leg, wherein the lateral offset is increased in the opposite direction to the lateral offset of the forward leg up to a second offset value at the end position of the return leg.

A C-arm system comprising:

• a C-arm configured to rotate or pivot about a rotational axis or a pivot axis;
• an X-ray source arranged at a first end of the C-arm;
• an X-ray detector arranged opposite the X-ray source at a second end of the C-arm, wherein the X-ray detector is configured to capture projection data from an object under examination;
• a control facility configured to:
• perform a forward leg of a rotation of the C-arm, which includes:
• starting the forward leg at a start position of the forward leg of the C-arm with a lateral offset that has a first offset value;
• and rotating the C-arm in a forward direction as far as an end position of the forward leg, wherein the lateral offset is reduced to a value of 0;
• and
• perform a return leg of a rotation of the C-arm, which includes:
• starting the return leg at the end position of the forward leg;
• and rotating the C-arm in a return direction as far as an end position of the return leg, wherein the lateral offset is increased in the opposite direction to the lateral offset of the forward leg up to a second offset value at the end position of the return leg;
• and
• a reconstruction unit configured to reconstruct image data based on the captured projection data.