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Table 1 The planning objectives in both RapidArc and IMRT plans for NPC

From: Advanced nasopharyngeal carcinoma radiotherapy with volumetric modulated arcs and the potential role of flattening filter-free beams

Structures

Planning objectives

PTV70

V70 ≥ 95%,D1% ≤ 77Gy

PTV66

V66 ≥ 95%

PTV60

V60 ≥ 95 %

Brain stem

D1% < 60Gy

Spinal cord

D1% < 45Gy

Optic nerves

D1% < 50Gy

Lens

D1% < 10Gy

Larynx

Dmean < 40Gy

Oral cavity

Dmean < 40Gy

Parotid glands

Dmean < 40Gy

Normal tissue

as low as possible

  1. Abbreviations: PTV70 = planning target volume of the primary nasopharyngeal tumor; PTV66 = planning target volume of involved regional lymph nodes; PTV60 = planning target volume receiving 60 Gy; V D  = the percentage volume of the PTV at the prescribed dose and D was the prescribed dose; D 1%  = dose received by 1% of the volume.
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Radiation Oncology

ISSN: 1748-717X

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