Figure 2
From: The utility of quantifying the orientation of breast masses in ultrasound imaging
Measurement of the orientation angle. (A) The left plot is a schematic diagram illustrating the measurement of the orientation angle. Line a represents the interface between the skin of the breast and a transducer placed perpendicular to the skin of the breast. Line b represents the maximal diameter of the breast mass and its extension. The orientation angle is the acute angle between line a and line b. (B) The right plot shows an actual measurement of the orientation angle (78.8°) in a subject with breast cancer.
