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Table 1 Quality parameters COV and S D

From: Fast IMRT by increasing the beam number and reducing the number of segments

Technique MUeff Field Segment norm. COV SD/n T (old) T (new) MUeff field Segment norm. COV SD/n T (old) T (new) MUeff field Segment norm. COV SD/n T (old) T (new)
   # #    [min] [min]   # #    [min] [min]   # #    [min] [min]
  Patient Cases
  Prostate Spine Breast
DMPO 9 591 9 50 1.00 0 11.8 7.8 [7.4] 888 9 50 1.00 0 12.3 8.2 [8.8] 821 10 38 1.00 0 10.9 [10.4] 6.5
2-Step IMRT 9 466 9 38 1.02 0.1 10.2 6.1 755 9 44 1.05 0.4 11.9 7.2 898 10 30 1.03 0.8 10.1 6.2
2-Step IMRT 15 492 15 47 0.53 0 12.9 7.2 711 15 64 1.00 0.2 17.2 9.7 927 15 41 0.69 0.3 13.2 7.5
2-Step Fast         901 34 34 1.07 0.3 14.4 7.5 [7.1] 672 25 25 0.81 0.7 10.3 [10.5] 5.3
2-Step Fast* 468 23 23 0.73 0 9.3 4.7 [5.0]               
DMPO Fast 378 23 23 1.31 0.8 5.7 4.5 565 36 36 1.46 1.1 8.9 7.1 377 25 25 3.49 5.3 9.7 4.9
  Phantom Case
  Quasimodo S4 Quasimodo S10 Quasimodo P10
DMPO 9 525 9 54 1.00 0.9 13.6 8.1 [8.0] 501 9 54 1.00 1.0 13.5 8.1 493 9 54 1.00 1.5 13.4 [13.3] 8.1
2-Step IMRT 9 507 9 40 1.01 0.9 13.6 8.1 526 9 45 0.76 0.8 11.8 7.1 508 9 40 0.82 1.0 10.7 6.5
2-Step IMRT 15 511 15 75 0.48 0 18.6 10.5 538 15 73 0.36 0 18.3 10.3 520 15 67 0.34 0 17.0 9.6
2-Step Fast 802 30 30 1.10 0.6 12.8 6.7 [6.6] 863 30 30 1.02 1.0 13.0 6.8 816 30 30 0.59 0.8 12.9 [12.9] 6.7
2-Step Fast* 504 30 30 1.14 0.6 11.8 6.0 [6.0] 581 30 30 0.74 0.7 12.0 6.1 554 30 30 0.54 0.5 12.1 [12.2] 6.2
DMPO Fast 401 30 30 9.1 6.0 11.5 5.7 397 30 30 21.3 7.9 11.5 5.7 393 30 30 28.2 8.0 11.5 5.7
  1. Overview of the resulting quality parameters COV and SD of all plans used in the study (lower values correspond to better plans). n: number of objectives used to calculate the normalized quality index S D /n. For prostate, spine, and breast cases, the reference achieves S D = 0 by definition. T: delivery time calculated using Eq. (1), for an old linac with slow data handling and a new linac with fast data handling. Values in brackets: measured values.
  2. S4: Elekta Synergy™ with 4 mm leaves (BeamModulator™), S10: Elekta Synergy™ with 10 mm leaves. P10: Siemens Primus™ with 10 mm leaves. The techniques are presented in detail in the text.