Dose Course 2018_Flipping book

Dose-coverage histogram (DCH)

90% iso-probability line, DVH

Systematic error

90%

• •

Sampled from normal distribution

DCH

98%

Used to shift the CTV

Random error

• • •

Normal distribution

Infinite number of fractions Convolution of dose (or fluence)

Calculate DVH for CTV One entire treatment course

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Repeat for N treatments

Create coverage map

D

98%

Gordon et al., Med Phys 37:550, 2010