Fig. 6

Representative axial, coronal and sagittal images of the phantom for 3 representative CT acquisition parameter combinations for low (CTDI 0.3 mGy) (a, b), medium (CTDI 1.0 mGy) (C,D) and high (CTDI 3.3 mGy) (e, f) X-ray exposure. CT reconstructed with FBP (a, c, e) and iteratively (b, d, f). The grayscale images are from the TR reconstruction (scale SUV 0–4.5). The adjacent image shows those voxels in the TR that differ by greater than the QSD from the RR overlaid in red