The phantom consisted of a 10 cm diameter, 4 cm thick Lucite cylinder with (12 mm diameter, 3 mm thick) holes containing Al disks of known thickness d (25 to 125 micron) immersed in Wax.
Space resolution We measured the Line Spread Function (LSF) of the system by imaging the sharp edge of a Tungsten bar which was positioned slightly tilted w.r.t. the pixels axis |
Details on the analysis can be found in our paper "Experimental test of a new technique of background suppression in digital mammography" [Proc. Int. Conf. VCI 2001 - Wien - to be published on Nucl.Instr & Methods]
Due to Compton scattering in the body, image contrast C is expected to be degraded by a factor 1/(1+R) where R is the Secondary (S) to Primary (P) ratio. :
Conclusions :