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Dose-coverage histogram (DCH)

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

DCH

98%

90% iso-probability line, DVH

90%