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Dose-coverage histogram (DCH)
Gordon et al., Med Phys 37:550, 2010
Calculate DVH for CTV
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One entire treatment course
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Create coverage map
Random error
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Normal distribution
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Infinite number of fractions
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Convolution of dose (or fluence)
Systematic error
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Sampled from normal distribution
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Used to shift the CTV
Repeat for N treatments
DCH
98%
90% iso-probability line, DVH
90%