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Table 3 A comparison of target dose homogeneity (HI, DHD), dose conformity (CN), D1cc for spinal cord, V20Gy and V5Gy values for lungs, and mean dose to lung and oesophagus obtained by dynamic conformal arc therapy plans with different values of collimator angle

From: Treating lung cancer with dynamic conformal arc therapy: a dosimetric study

   Dynamic conformal arc therapy (DCAT)
Parameter 3D CRT 30° 45° 90°
HI 0.144±0.018 0.132±0.027 0.133±0.027 0.133±0.027 0.134±0.028
DHD 0.028±0.005 0.032±0.007 0.032±0.007 0.032±0.007 0.032±0.007
CN 0.594±0.109 0.688±0.071 0.692±0.069 0.692±0.068 0.674±0.083
Spinal cord: D1cc (cGy) 2888±985 2916±723 2903±717 2896±711 2971±733
Lung: V20Gy (%) 23.9±9.4 22.9±12.1 23.1±12.2 23.3±12.3 23.7±12.5
Lung: V5Gy(%) 53.6±17.8 63.3±18.9 63.5±18.9 63.5±18.9 63.1±18.8
Lung: MLD (cGy) 1173±422 1270±466 1278±470 1284±473 1289±480
Oesophagus: D mean (cGy) 1695±756 1750±756 1751±749 1752±748 1740±744
  1. The corresponding values (mean ± sd) obtained by conventional 3D CRT are given for comparison