Computed tomography and laminography

Computed laminography (CL) is an imaging technique especially suited for flat samples. CL is a generalization of CT that uses a rotation axis tilted by less than 90 degrees with respect to the incident beam. Thus CL avoids using projections from angles closest to the sample surface.

Computed laminography (CL) is an imaging technique especially suited for flat samples. CL is a generalization of CT that uses a rotation axis tilted by less  Fig. 1Fig. 2Fig. 3Fig. 4

CT requires the object to be imaged from many directions around a circle. This is not possible for extended objects either due to geometrical restrictions or because of the high absorption of the x-ray along the longitudinal directions. In these cases computed laminography (CL) provides a viable alternative to CT.

In computed tomography (CT) projection images of the sample are recorded from different directions around a rotation axis.The second geometry, called computed  Fig. 1Fig. 2Fig. 3Fig. 4

Unlike computed tomography, laminography does not record 360-degree projections to generate spatial information but scans objects from a limited angular range. This limited angle allows moving the X-ray tube much closer to the flat inspection object for higher resolution.