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Figure 2a. Measurement of the short axes of the RV and LV on axial CT pulmonary angiograms. (a) The short axis of the RV is measured at the level of the tricuspid valve from inner wall to inner wall at the widest point, which is typically in the basal third of the ventricle. (b) The short axis of the LV is measured at the level of the mitral valve from inner wall to inner wall at the widest point, which also is typically in the basal third of the ventricle. Note that the short axes of the RV and LV may be located at different axial CT levels.
