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Table 3 Treatment plan comparison for metastases of the lumbar vertebra (SIB)

From: Application of volumetric modulated arc therapy (VMAT) in a dual-vendor environment

Structure

Parameter

DVO

Single Arc

IMRT

GTV

D50%

Uniform

55.0 Gy

55.0 Gy

 

H

Dose

7.3

7.1

GTV

V95%

55 Gy

95.6%

95.9%

PTV

D95%

≥ 40.0 Gy

41.4 Gy

40.5 Gy

Normal Tissue

D1%

≤ 40.0 Gy

41.3 Gy

42.6 Gy

 

D20%

≤ 15.0 Gy

13.6 Gy

8.0 Gy

 

D60%

≤ 5.0 Gy

1.8 Gy

1.3 Gy

Left Kidney

D40%

≤ 10.0 Gy

9.4 Gy

7.8 Gy

Right Kidney

D40%

≤ 10.0 Gy

9.0 Gy

5.3 Gy

Spinal Cord

D1 ccm

≤ 45.0 Gy

41.7 Gy

41.1 Gy

Monitor Units

MU/2.5 Gy

-

698

736

Time

Calculation

-

13:50 min

2:45 min

 

Delivery

-

4:30 min

11:00 min

  1. DX% and D1 ccm are the doses delivered to X% of the volume and 1 cm3 respectively, V95% the volume receiving 95% of the prescription dose in%, Homogeneity H = (D5% - D95%)/Daverage.