|
 Description of the parameters
Asymmetry
For the determination of asymmetry, axes crossing the center of the lesion are analyzed. For each of these axes the agreement of the lesion on both side the axis is measured. The agreement is used as the measurement of symmatry. On the right side the measure of symmatry is shown as diagram for the angles of rotation of the symmetry axes. With consideration of all axes a score for the asymmetry of the lesion is determined.
Moving the mouse over over diagram you can check the appropriate axis in the analysis image.
Diagram with the asymmetry data for the different angles of the regarded symmetry axes.
Border
For the determination of the edge acuity as measure of the border the originally determined edge is compared with a smoothed edge.
If a position in the diagram is selected using the mouse, the appropriate boundary region in the left picture is marked.
Color
The color parameter measures the differences and distribution of color occurring in the image. A measurement of the absolute color value is not meaningful, since the patients skin will be more or less tanned depending on the season. With this score the structural information is used in consideration of color distribution.
The rotating RGB diagram on the right side serves as an illustration of color dispersion. This diagram shows the red, green and blue values for each pixel. The color distribution of nevi frequently appears as a closed tube. In pictures of melanomas this tube will usually be broader and widen towards the lower end.
Color distribution of the lesion in the animated 3D RGB diagram
Diameter
As is the case for asymmetry, for the determination of maximum diameter axes are placed across the center of the lesion. For all axes the outermost edge is used in the determination of the diameter. Depending on the angle of rotation, the measured diameters are given in the diagram on the right side.
|
|
|