Dosimetric Comparison of Three Radiotherapy Techniques in Irradiation of Left-Sided Breast Cancer Patients after Radical Mastectomy

Table 1

Anatomic borders of divided PTV regions in TSP.

Structures	Anterior	Posterior	Medial	Lateral	Cranial	Caudal
PTV-SC	Same as supra/infraclavicular border of RTOG
PTV-EB	Posterior border of PTV	Posterior border of PTV	Vertical line of the maximum spacing between of lungs	Lateral border of PTV	Caudal border of PTV-SC	Caudal border of PTV
PTV-CW	Anterior border of PTV	Posterior border of PTV	Lateral border of PTV-IM	Medial border of PTV-EB	Caudal border of PTV-SC	Caudal border of PTV
PTV-IM	Anterior border of PTV	Posterior border of PTV	Medial border of PTV	7-10 mm margin of internal mammary vessels	Caudal border of PTV-SC	Caudal border of contralateral breast

Abbreviations: PTV: planning target volume; PTV-SC: supra/infraclavicular PTV region; PTV-CW: chest wall PTV region; PTV-IM: internal mammary nodes PTV region; PTV-EB: external breast PTV region; TSP: target segmented planning; RTOG: Radiation Therapy Oncology Group.