Fig. 2From: Comments on the NEMA NU 4-2008 Standard on Performance Measurement of Small Animal Positron Emission TomographsVisualization of the influence of anisotropic detector resolution on the filtered backprojection and resulting spatial resolution along the two axis. e, h, k The simulation with only gaps. f, i, l The simulation with anisotropic detector resolution and gaps of 10 detector modules. g, j, m A measurement. The simulation with anisotropic detector resolution and the measurement exhibit a star-like artifact in the reconstruction, which leads to a split in spatial resolution along x and y axis, as shown in the bottom rowBack to article page