Fig. 3
From: Assessment of the axial resolution of a compact gamma camera with coded aperture collimator
a Successive number of iterations for the 3D-MLEM algorithm applied to the source and reconstructed at 30 mm. b Raw (left) and preprocessed detector image (right). c The left image shows the forward projection of 3D-MLEM for the source at 40 mm and the right image shows the reconstruction at 40 mm. Due to the \(2\times 2\) arrangement of the basic MURA pattern, multiple ghost sources (blue arrows) along the image border emerge in addition to the true source (green circle) from the 3D-MLEM algorithm for sources that are more than 40 mm away