Process

Phantom

Cpm 3% clinical specifications

Cpm 5% clinical specifications

Clinical specifications for Cpm = 1.33

PB/IC

Solid H2O

0.82

1.36

4.9

MC/IC

0.72

1.21

5.5

PB/IC

Bone

0.45

0.75

8.8

MC/IC

0.59

0.99

6.7

PB/IC

0.52

0.86

7.7

IC/MC

Tissue

0.53

0.89

7.5

PB/MC

0.45

0.75

8.8

TLD/MC

0.85

1.41

4.7

IC/MC

Lung

0.38

0.64

10.4

PB/MC

0.15

0.25

26.9

TLD/MC

0.40

0.67

9.9
Table 2: This table shows the process target and process capability (Cpm) for the 11 IMRT QA processes considered in this study against 3% and 5% clinical specifications. The last column of the table show the required clinical specification limit required to achieve Cpm = 1.33 (as a percent difference from the plan normalized dose) that would be required to reach an optimal performing process