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Analysis using DVHs
•
The main drawback of DVHs is the
loss of
spatial
information
that results from the
condensation of data when DVHs are calculated.
•
The parameters of volume and dose are useful,
but some questions remain unanswered:
Is an entire segment across the spinal cord being
irradiated or just an elongated segment on one
side?
In combined lung DVHs, is one lung receiving a
very high dose and the other very little dose, or
are both receiving equal dose?