Table 1 Planning and treatment parameters
A | B | C | D | |
|---|---|---|---|---|
TPS | XiO | iPlan | iPlan | Pinnacle |
Calculation algorithm | SuperPosition | Pencil Beam | XVMC | CCCS |
Prescription dose | ChildA: 40Gy/5fr | 44Gy/4fr | Peripheral: 48Gy/4fr | Peripheral: 48Gy/4fr |
ChildB: 35Gy/5fr | PeriGI:60Gy/8fr | Cenrtral:60Gy/8fr | ||
Prescription point | 70% isodose | Isocenter | Isocenter | Isocenter |
Beam arrangement | Dynamic conformal arc | Dynamic conformal arc | Static | Static |
Non-coplanar, 8 arcs | Coplanar, 2 arcs | Non-coplanar, 6–8 beams | Non-coplanar, 6-8 arcs | |
Respiratory movement | Confined free-breathing(<1cm) | Confined free-breathing | Confined free-breathing | Gated by Abches® or RPM |
Under abdominal compression | Under abdominal compression | Under abdominal compression | ||
Target definition CT | Fusion of LSTCT + dynamic CT | Fusion of 4 times breathing CT | Fusion of 4DCT + breath-hold CT | Breath-hold CT |
Planning CT | LSTCT | LSTCT | AveIP from 4DCT | Breath-hold CT |
ITV | GTV + 2-6mm | Fusion of 4 times breathing CT | Directly visualized by LSTCT | ITV = GTV |
PTV | ITV + 2mm | ITV + CC10mm, AP, LR8mm | ITV + 5mm | ITV + CC8mm, AP, LR5mm |
Dose constraints | ||||
Liver | V20(include PTV) < 20% | V<16 > 700 cc | V20 < 25% V<15 > 700 cc | V20≦25% |
Spinal cord | Dmax < 25Gy, D1cc < 20Gy | Dmax < 25Gy/4fr | Dmax < 25Gy/4fr | Dmax < 25Gy/4fr |
GI tract | Dmax < 25Gy, D1cc < 20Gy | D10cc < 35Gy/4fr | D1cc < 40Gy/4fr, D10cc < 35Gy/4fr | D1cc < 30Gy/4fr, D10cc < 24Gy/4fr |
Kidney | - | V20 < 30% | V20 < 30% | D1/3 < 20Gy/4fr |
Heart | - | - | - | D1/3 < 28Gy/4fr |
Gallbladder | - | - | - | D1/3 < 40Gy/4fr |