Radiographic imaging with a linear x-ray source and multi-row detector

A tetrahedron beam CT (TBCT) benchtop system has been developed with linear array x-ray source with 48 focal spots in 4 mm spacing and a photon counting detector (PCD). The generated x-ray beams are collimated to fan beams by a multi-slot collimator and converge to the 6 mm wide multi-row photon counting detector. Due to its scatter rejection geometry, the scatter-to-primary ratio (SPR) is significantly reduced to 17% for fan beam comparing to 120% for cone beam in presence of a head phantom. We performed both 2D and 3D imaging study with the TBCT system. 2D radiography images have been obtained using shift-and-add method. Both analytical and iterative reconstruction methods were used in 3D image reconstruction. Head phantom and animal cadaver were scanned.