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Figure 4: A simulation film of radiation treatment field and isodose line display. (a) Radiation fields consisted of two bilateral fields in the upper neck and an anterior port with a midline shield in the lower neck, (b) An isodose line is displayed in entire neck region

Figure 4: A simulation film of radiation treatment field and isodose line display. (a) Radiation fields consisted of two bilateral fields in the upper neck and an anterior port with a midline shield in the lower neck, (b) An isodose line is displayed in entire neck region