ESTRO course Dose Modelling and Verification 2017

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DCH as optimization criteria
03/01/13
Gordon et al., Med Phys 37:550, 2010
Calculate DVH for CTV
• One entire treatment course
• Create coverage map
Random error
• Normal distribution
• Infinite number of fractions
• Convolution of dose (or fluence)
Systematic error
• Sampled from normal distribution
• Used to shift the CTV
Repeat for N treatments
Example of optimization objective:
DCH98%
90% iso-probability line, DVH90%
% ≥ ≥ %
Dpresc