Semicircular inversed offset scanning for enlarged field of view 3d

An imaging system for acquiring projection images of a physical object, the system comprising:

• a radiation source (202) that generates X-rays;
• a radiation detector (204) for detecting rays of radiation originating from the radiation source;
• a support that rotatably supports the source and the detector around a rotational axis (214);
• wherein the radiation detector (204) is configured to be laterally displaced from a position with centered detector geometry with a centered transverse field of view (FOV) to a first offset position (212) and from the first offset position to a second offset position (226), with opposite direction and double length of the first displacement (a).

A computer readable medium having stored thereon computer-executable instructions enabling a computer to carry out a method using a radiation detector (204) and a radiation source (202), both mounted on a support, the support rotatable around a rotational axis (214);

• the method comprising steps in the following order:
• a) laterally displacing the radiation detector (204) from a position with centered detector geometry with a centered transverse field of view to a first offset position (212);
• b) emitting first radiation by the radiation source (202), detecting the first radiation by the radiation detector (204) and acquiring projection data indicative of the first radiation;
• c) rotating the support around the rotational axis (214) by 180°;
• d) emitting second radiation by the radiation source (202), detecting the second radiation by the radiation detector (204) and acquiring projection data indicative of the second radiation;
• e) laterally displacing the radiation detector (204) from the first offset position to a second offset position (226), with opposite direction and double length of the first displacement (a);
• f) emitting third radiation by the radiation source (202), detecting the third radiation by the radiation detector (204) and acquiring projection data indicative of the third radiation;
• g) rotating the support around the rotational axis (214) by 180°;
• h) emitting fourth radiation by the radiation source (202), detecting the fourth radiation by the radiation detector (204) and acquiring projection data indicative of the fourth radiation.

A computer program element configured and arranged to control when executed on a computer a method using a radiation detector (204) and a radiation source (202), both mounted on a support, the support rotatable around a rotational axis (214);

• the method comprising steps in the following order:
• a) displacing the radiation detector (204) from a position with centered detector geometry with a centered transverse field of view to a first offset position (212);
• b) emitting first radiation by the radiation source (202), detecting the first radiation by the radiation detector (204) and acquiring projection data indicative of the first radiation;
• c) rotating the support around the rotational axis (214) by 180°;
• d) emitting second radiation by the radiation source (202), detecting the second radiation by the radiation detector (204) and acquiring projection data indicative of the second radiation;
• e) displacing the radiation detector (204) from the first offset position to a second offset position (226), with opposite direction and double length of the first displacement (a);
• f) emitting third radiation by the radiation source (202), detecting the third radiation by the radiation detector (204) and acquiring projection data indicative of the third radiation;
• g) rotating the support around the rotational axis (214) by 180°;
• h) emitting fourth radiation by the radiation source (202), detecting the fourth radiation by the radiation detector (204) and acquiring projection data indicative of the fourth radiation.