Skip to main content

Table 2 Planning objectives for the target and organs at risk

From: Dosimetric comparison between RapidArc and HyperArc techniques in salvage stereotactic body radiation therapy for recurrent nasopharyngeal carcinoma

Objectives

Parameters/organs

Tolerance

Priority

Target

Maximum dose

≤ 120% of the prescription dose

2

 

Coverage (minimal)

95% of the prescription dose cover 95% of the PTV

2

Organs at risk

Spinal cord

Dmax < 10 Gy or Cumulative dose of EQD2 < 50Gy (83.33Gy3)

1

 

Brainstem

Dmax < 13 Gy or Cumulative dose of EQD2 < 54Gy (90.00Gy3)

1

 

Optic nerve

Dmax < 12 Gy or Cumulative dose of EQD2 < 50Gy (83.33Gy3)

2

 

Chiasm

Dmax <15Gy or Cumulative dose of EQD2 < 54Gy (90.00Gy3)

1

 

Eye

Dmax < 10 Gy or Cumulative dose of EQD2 < 50Gy (83.33Gy3)

2

 

Lens

Dmax <4Gy

3

  1. Abbreviations: Dmax The maximal point dose of the organ at risk EQD2 Equivalent dose to 2 Gy per fraction, Gy3 Unit of BED with α/β ratio of 3 Gy
Back to article page

Radiation Oncology

ISSN: 1748-717X

Contact us