Fig. 3

SPECT images for assessment of spatial resolution with respective hot-rod phantoms (a) and uniformity with homogenously filled phantoms (b). c Shows corresponding line profiles illustrated as yellow line in (b). Contrasting juxtaposition of the three investigated collimators UHS-M, GP-M and XUHR-M. Right side shows data acquired with the 3DT-Scanner. Smallest discriminable rod size was 0.75 mm for the UHS-M, 0.50 mm for the GP-M (2DT-Scanner and 3DT-Scanner), 0.35 mm for the XUHR-M. Uniformity records 23.0% (UHS-M), 31.2% (GP-M), 16.3% (GP-M, 3DT-Scanner) and 41.3% (XUHR-M). Representative images were chosen with slice thickness of 0.2 mm for UHS-M and GP-M and 0.1 mm for XUHR-M, respectively, for optimal visualization