Figure 8.

Illustration of the method used to determine the optimal swale-depth in prone breast CT (not drawn to scale). In (A), the swale dimensions are shown. S^P is the skin mark with the subject positioned for prone breast CT. S^M is the skin mark along the posterior edge of the breast support with the subject positioned for mammography and is posterior to S^P by at the most 9 mm for 95% of study participants (D_0.95 =9 mm). The point marked by a cross is anterior to S^M by L^M, which is the accepted limit for chest-wall missed tissue in mammograms. In (B), ${\gamma }_p^T$ is the cone angle needed to image through the point (marked by cross) that is posterior to S^P by D_0.95−L^M along the axis of rotation (AOR). In (C), the breast volume where the image quality will be reduced is shown.