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. 2014 May 29;9:123. doi: 10.1186/1748-717X-9-123

Table 2.

RPC and VPP average percentage of pixels passing the gamma criteria at 3%/3 mm, 5%/5 mm and 7%/4 mm for 12 institutions of the EORTC for IMRT complex dosimetry checks

 
 RPC
  
  
 VPP
Institution number 3%/3 mm (%) RPC PH 5%/5 mm (%) RPC PH 7%/4 mm (%) RPC PH Number of verified fields Measurement device 3%/3 mm (%) [SD] INST PH 5%/5 mm (%) [SD] INST PH 7%/4 mm (%) [SD] INST PH
1
 89.3
 99.9
 99.8
 Combined
 Delta4
 100.0 [-]
 100.0 [-]
 100.0 [-]
2
 62.9
 82.0
 91.2
 Combined
 PTW 2D-array
 93.2 [-]
 99.0 [-]
 99.4 [-]
3
 78.1
 99.9
 97.8
 Combined
 PTW 2D-array
 90.8 [0.9]
 100 [0.2]
 100 [0.3]
4
 84.7
 98.2
 99.5
 Combineda
 PTW 2D-array
 84.1 [1.9]
 95.7 [0.6]
 96.4 [0.7]
5
 80.1
 98.2
 99.3
 Combineda
 Varian Portal
 96.5 [3.3]
 99.8 [0.3]
 100.0 [0.0]
6
 96.4
 99.8
 99.9
 9
 Varian Portal
 96.6 [2.2]
 99.4 [1.3]
 100.0 [0.0]
7
 96.5
 99.8
 100.0
 Combined
 PTW 2D-array
 85 [1.3]
 96.6 [0.6]
 97.3 [0.5]
8
 89.1
 96.9
 98.1
 Combined
 EDR2-Film
 89.1 [-]
 99.3 [-]
 99.9 [-]
9
 73.5
 91.9
 95.5
 Combined
 Delta4
 99.5 [-]
 100.0 [-]
 100.0 [-]
10
 79.6
 94.1
 98.8
 Combined
 Delta4
 98.4 [-]
 100.0 [-]
 100.0 [-]
11
 89.9
 98.9
 99.7
 Combined
 EDR2-Film
 92.2 [-]
 97.0 [-]
 100.0 [-]
12
 72.5
 93.0
 96.8
 Combined
 Delta4
 97.1 [-]
 100.0 [-]
 100.0 [-]
CDC
  
  
  
  
  
  
  
  
Pass at 80% pixel level
 7
 12
 12
  
  
 12
 12
 12
Pass at 90% pixel level
 2
 11
 12
  
  
 9
 12
 12
Pass at 95% pixel level 2 8 11     6 12 12

Abbreviations: RPC: Radiological Physics Center; VPP: Virtual Phantom Project; SD: Standard Deviation; CDC, complex dosimetry checks. Combined: A combined measurement of all fields is made a: measured twice.