Fig. 4From: Optimising dual-energy CT scan parameters for virtual non-calcium imaging of the bone marrow: a phantom studyLower pitch image acquisition reduced spiral-like artefacts in virtual non-calcium images. Orthogonal reformats (a–d) of virtual non-calcium images acquired at different pitch angles. Notice that spiral-like artefacts clearly visible at pitch 1.2 and 0.8 have almost disappeared at pitch 0.3Back to article page