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)
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] |