The Prism Program

The NTCP panel



The NTCP panel (normal tissue complication probability) consists of two areas. In the top area the parameters required for the NTCP models can be entered and modified.


These parameters are:

TD50 Dose to a reference volume (in Gy) that would result in 50% complication probability after 5 years
n Parameter describing the volume dependence
m Parameter describing the slope of the NTCP vs. dose



Functions of the different elements:

  • Read Param: Opens a list of organs for which parameters sets are available. After selecting one organ the according parameters can be loaded.

  • Write Param: Stores user defined parameters.

  • Calc: When pressing this button the normal tissue complication probability is calculated with the parameters specified on top. The calculation is done for all selected plans, which are listed above.


For further information about the TCP and the NTCP panel: see Prism User’s Reference Manual, p. 75ff.



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