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Table 2 Dose-response parameters used in the relative seriality model for the organs at risk included in the optimization [30–33].

From: Radiobiological evaluation of forward and inverse IMRT using different fractionations for head and neck tumours

Tissue

D50/Gy

γ

s

Endpoint

PTV1

51.0

7.5

-

Control

PTV2

44.0

4.0

-

Control microscopic disease

PTV3

38.0

2.0

-

Control microscopic disease

Spinal cord

57.0

6.7

1.00

Myelitis necrosis

Parotids

46.0

1.8

0.01

Xerostomia

Mandible

70.3

3.8

1.00

Marked limitation of joint function

Oral cavity

70.0

3.0

0.50

Mucositis

Lungs

30.0

1.0

0.01

Severe radiation pneumonitis-fibrosis

Surrounding tissue

65.0

2.8

1.00

Necrosis

  1. D50 is the dose which gives a 50% response,
  2. γ is the maximum normalized dose-response gradient,
  3. s is the relative seriality parameter.