Evaluating the spatial characteristics of a tilted-collimator scintillation camera

In PET Laboratory at the National Laboratories of Legnaro, INFN, we are exploiting a recently developed gamma-ray imaging camera using tilted-collimator (TC) technique. The parallel-hole lead collimator of the camera can be tilted at small angles around an axis parallel to the scintillator plane, thus enabling to determine the distance of imaged objects. However, in order to allow sizeable tilt angles, the collimator-to-scintillator distance has been increased to 8mm. Moreover, when the collimator is tilted at a certain angle the distance between the collimator and the scintillator varies throughout the whole field of view (FOV). These conditions may affect the spatial resolution of the imaging camera. It is important to know how much the collimator-to-scintillator distance and the tilt angle influence the spatial characteristics of the TC camera throughout the whole FOV. In this work the results of the spatial resolution measurements for the TC Yttrium Aluminum Perovskite (YAP) scintillation camera are presented.