Operating method for X-ray equipment

A software program embedded in a computer readable medium for operating an X-ray equipment, comprising software modules programmed and configured to:

• repeatedly pivot an X-ray arrangement about a pivot axis at a pivoting speed between a first and a second final angular position, the X-ray arrangement comprising an X-ray source and an X-ray detector diametrically opposed to each other relative to the pivot axis;
• provide a phase signal representing a phasing of an examination object to the control device;
• control the X-ray arrangement during the pivoting such that the X-ray detector only acquires projections of an iteratively moving examination object during selected time windows in time periods based on a phase signal at a plurality of acquisition points in time and at a plurality of angular positions of the X-ray detector, the examination object arranged in a range of the pivot axis;
• transmit the acquired projections to a control device of the X-ray equipment;
• store the transmitted projections and the respective angular positions in the control device;
• assign to each stored projection a phase information element related to the phasing of the examination object;
• selecting a phase position, and a maximum allowable deviation therefrom, relative to the phase signal for three dimensional reconstruction of the object;
• selecting from the projections those projections having phase positions within the maximum allowable deviation from the selected phase position;
• determining for each selected projection the respective angular position of the X-ray detector;
• and
• calculating a three-dimensional reconstruction of the examination object from the selected projections and the determined respective angular positions for use in a medical examination.

A method of operating a computer for creating three dimensional medical images to be used in a medical examination, comprising:

• feeding to the computer a plurality of projections of an examination object as the object undergoes cyclic motion, the projections recorded by an X-ray arrangement while pivoting the X-ray arrangement about a pivot axis between a first and a second final angular position, the X-ray arrangement comprising an X-ray source and an X-ray detector arranged diametrically opposed to each other relative to the pivot axis, the projections recorded at a plurality of angular positions of the X-ray detector, each projection including information elements about the respective angular position of the X-ray detector and about a phasing of the examination object;
• providing a phase signal representing a phase in the motion cycle of the examination object;
• selecting a phase position, and a maximum allowable deviation therefrom, relative to the phase signal for three dimensional reconstruction of the object;
• selecting from the projections those projections having phase positions within the maximum allowable deviation from the selected phase position;
• determining for each selected projection the respective angular position of the X-ray detector;
• and
• calculating a three-dimensional reconstruction of the examination object from the selected projections and the determined respective angular positions for use in the medical examination.