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Nonconformal Radiation Delivery:
This illustration uses a pear to demonstrate the difficulty in obtaining conformal radiation planning using spherical targeting (Gamma Knife). In this example of a pear-shaped target, the two differently sized spherical doses cannot cover the entire target (undertreated areas) unless either the surrounding normal tissue receives a high dose of radiation, or there is a larger overlap of the spheres, which can cause complications due to an excessive radiation dose, or hotspot.
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