Fig. 2From: Comprehensive target geometric errors and margin assessment in stereotactic partial breast irradiation a Breast quadrants. The quadrant division is centered at the nipple; b Cumulative frequency histogram of fiducial composite error in four breast quadrants (similar to cumulative dose volume histogram fashion). Here, we use point O as an example to explain the curve. The point O represents 8% of time lower inner fiducial has an error at least 5.0 mm or greaterBack to article page