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Comparison of Pencil Beam and Collapsed Cone
Pencil Beam
•
95% coverage appears greater
•
Overall coverage is increased
•
Hotspots appear in areas
affected by the lower density of
the lung
•
Calculates the effect of the
inhomogenous areas in 1
dimension
Collapsed Cone
•
95% coverage is compromised
in areas of the lung
•
Overall coverage is decreased.
This can be most noticeable at
the superior and inferior ends of
the volume
•
Hotspots appear minimal
•
Calculates the effect of the
inhomogenous areas in 3
dimensions