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Limitation of Point A
•
Different methods of definition provide different
values
for the calculated dose rate to point A.
•
Relates to
position of sources and not to specific
anatomic structure.
•
It is
very sensitive to position of ovoid
sources
relative to tandem which should not be deciding
factor in deciding on implant duration.
•
Depending
on size of cervix
point A may be inside
or outside of tumor.