treatment field

treatment field
n.
(in radiotherapy) an area of the body selected for treatment with radiotherapy. For example, a mantle field comprises the neck, armpits, and central chest, for the radiotherapy of Hodgkin's disease. Radiation is administered to the defined area by focusing the beam of particles emitted by the radiotherapy machine and shielding the surrounding area of the body.

Medical dictionary. 2011.

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