Organ

Objective

Rapid Arc Mean ± SD

LF-IMRT Mean ± SD

p-Value (Independent Student t test)

Rapid Arc vs LF-IMRT

Spinal Cord

D1%

<46 Gy

37.7 ± 4.7

40.7 ± 7.1

0.047

RA < IMRT

Lt.Parotid

Mean (Gy)

<26 Gy

21.26 ± 8.5

22.78 ± 11.2

NS

-

V30Gy (%)

<45%

22.37 ± 14.6

22.49 ± 19.6

NS

-

Rt.Parotid

Mean (Gy)

<26 Gy

22.37 ± 7.43

24.1 ± 8.0

NS

-

V30Gy (%)

<45%

25.52 ± 13.43

26.7 ± 14.1

NS

-

Larynx

Mean (Gy)

<45 Gy

37.49 ± 2.7

41.7 ± 4.2

0.002

RA < IMRT

Oral cavity

Mean (Gy)

<30 Gy

28.22 ± 4.3

32.7 ± 3.8

0.004

Healthy

Mean (Gy)

Minimise

9.02 ± 2.9

10.3 ± 3.3

NS

-

Tissue

V5 Gy (%)

Minimise

37.9 ± 9.3

37.0 ± 9.7

NS

-

V30 Gy (%)

Minimise

10.1 ± 3.9

13.1 ± 5.2

0.037

RA < IMRT

Integral

Dose

10⁵ cm³∙Gy

Minimise

1.147 ± 0.705

1.489 ± 0.758

NS

-