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Objective: We sought to compare the image quality of iterative model reconstruction (IMR) with statistical iterative reconstruction (SIR) in lumbar spine (L-spine) images reconstructed from computed tomography (CT) image data from examinations of the abdomen and pelvis compared with routine L-spine CT images reconstructed with SIR. Methods: We conducted a retrospective study to compare image noise in L-spine reconstructions using SIR and IMR techniques in consecutive CT abdomen and pelvis (CTAP) examinations, with L-spine CT images reconstructed using SIR. Hounsfield units and their standard deviations in areas of image noise were measured in bone, cerebrospinal fluid (CSF), and lumbar discs. The results of SIR and IMR were compared using paired t tests. The results of CTAP and CT L-spine were compared using the Mann-Whitney U test. A p value <0.05 was considered significant. Qualitative assessment of the bone/CSF, disc/CSF, and disc/bone interface was performed by two readers. Results: IMR generated less image noise than SIR with CTAP and L-spine CT with SIR, particularly on bone windows. There was also significant improvement in the clarity of interfaces between vertebral bodies, discs, epidural fat, and CSF with IMR. The mean radiation dose was much higher for L-spine CT compared with CTAP. Conclusion: IMR is superior to SIR for the image quality of reconstructed lumbar spine images from CTAP. The IMR lumbar spine image from CTAP image data acquired with a lower radiation dose was also shown to be clearer when compared with routine SIR L-spine CT images.

Iterative Model Reconstruction in Lumbar Spine Image Retrieval from Computed Tomography of the Abdomen and Pelvis