Figure 7b. Normal valves. (a) CT scan shows the aortic valve with right (R), left (L), and noncoronary (N) cusps and the pulmonary valve with right (R), left (L), and anterior (A) cusps. (b) CT scan shows the tricuspid valve with septal (S), anterior (A), and posterior (P) leaflets and the mitral valve with aortic (A) and mural (M) leaflets.