Highly reduced-dose CT of the lumbar spine in a human cadaver model
Fig 2
A Measurement of CT number and objective image noise (OIN). Axial CT image shows placement of ROI (circle) in the center of the body of the third lumbar vertebra. Measurements were performed in three adjacent slices and the mean values were calculated. B Quantitative analyses of OIN (defined as SD of CT number) for SDCT and three different RDCT protocols, as measured in the center of the body of the third lumbar vertebra. Images were reconstructed with FBP and IRL4 and IRL6. Horizontal midpoints of diamonds represent mean values, and error bars denote 95% CIs. Compared to SDCT with FBP, even the RDCT protocol with lowest dose (RDCT-3) reconstructed with IR resulted in lower OIN.