Figure 4: Early (A) and late (B) planar views. Single photon emission computed tomography study was performed using with 64×64 matrix. Transaxial (C-1), sagittal (C-2) and coronal (C-3) slices of technetium-99mmethoxyisobutylisonitrile single photon emission computed tomography study which were reconstructed using with iterative reconstruction. A parathyroid lesion was delineated in the lower pole of right thyroid lobe (C-3, arrow). The same parathyroid lesion could also be depicted in the lower pole of right thyroid lobe with filtered backprojection algorithm (D-3, arrow). However, streak artefacts were present on transaxial slices (D-1), and image degradation was observed compared to iterative reconstruction algorithm (patient no: 22, [Table 1]).