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. 2011 Dec;84(Spec Iss 3):S338–S354. doi: 10.1259/bjr/30655825

Figure 2.

Figure 2

Measuring perpendicular to the lumen is important in accurately determining the size of aortic dilatation. (a) CT angiogram (CTA) coronal multiplanar reconstruction (MPR) showing an inaccurate measurement oblique to the lumen in a tortuous aorta (∼6.9 cm). (b) True axial CTA image shows this erroneous oblique measurement. The second short axis (∼4.5 cm) measurement is more accurate. (c, d) Reconstructed curved MPR of the same CTA generates an MPR perpendicular to the centre line of the vessel. This gives the most accurate measurement but is considerably more time-consuming to generate. The true diameter is 4.5 cm. 3D, three dimensional.