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Table 2 Dose constraints for inverse planning

From: Normal lung sparing Tomotherapy technique in stage III lung cancer

Priority

Structure

Constraints

1

PTV

D95 ≥ 66 Gy (100%)

D99 ≥ 61.38 Gy (93%)

V72.6 (110%) ≤ 1 cm3

1

P-corda

Dmax ≤ 45 Gy

2

Normal lung (both lung - PTV)

Dmean ≤ 20 Gy

V5 ≤ 65%

V10 ≤ 45%

V20 ≤ 35%

3

Heart

V40 < 100%

V45 < 66%

V60 < 33%

4

Esophagus

Dmean ≤ 34 Gy

  1. D V D dose delivered to V% of organ volume, V D absolute or percentage of organ volume receiving D Gy or higher, D max maximum dose, D mean mean dose, OARs organ at risks
  2. aP-cord means the planning volume for the spinal cord which was generated by adding 3~5 mm margin to the actual spinal cord
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Radiation Oncology

ISSN: 1748-717X

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