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Table 2 Type 3 miss: the severity of the Type 3 geographic miss in each of the motion groups based on the mean [±SD] coverage of the 4D-PTV with 95% of the prescribed dose (total n = 29)

From: Geographic miss of lung tumours due to respiratory motion: a comparison of 3D vs 4D PET/CT defined target volumes

  5 mm PTV severity Mean 4D PTV coverage % [±SD] 10 mm PTV margin Mean 4D PTV coverage % [±SD] 15 mm PTV margin Mean 4D PTV coverage % [±SD] Asymetrical PTV Mean 4D PTV coverage % [±SD]
0- < 5 mm (n = 8) Minor 97 [2.9] Minor 97 [1.7] Minor 98 [3.3] Minor 98 [4.2]
5- < 10 mm (n = 6) Moderate 93 [5.9] Moderate 95 [7.9] Moderate 95 [4.8] Minor 95 [5.4]
10- < 20 mm (n = 11) Significant 86 [8.8] Moderate 92 [5.3] Moderate 92 [4.4] Moderate 92 [3.9]
20+ mm (n = 4) Significant 67 [16.7] Significant 76 [10.9] Significant 79 [12.0] Significant 81 [14.0]