| VMAT | Helical tomotherapy | ||
---|---|---|---|---|
Structures | Optimization objectives | Optimization priorities | Optimization objectives | Optimization priorities |
PTV 63 Gy | D50% = 63Â Gy | Very High | Dmin = 63Â Gy | Very high |
Dmin > 100% Dpresc HR | Very High | D50% = 63Â Gy | Very high | |
Dmax < 102% Dpresc HR | Very High | Dmax = 63Â Gy | Very high | |
PTV 54 Gy | - | - | Dmin = 54Â Gy | High |
D50% = 54Â Gy | High | |||
Dmax = 54Â Gy | High | |||
PTV 54 Gy – PTV 63 Gy | Dmin > 100%Dpresc LR | Very High | - | - |
Dmax < 95% Dpresc HR | High | Â | Â | |
D5% < 105%Dpresc LR | High | Â | Â | |
PTV 54 Gy –(PTV 63 Gy +1 cm) | Dmax < 95%Dpresc LR | High | - | - |
PRV medullary canal | Dmax < 35Gy | High | Dmax < 30Â Gy | High |
D2% < 33Â Gy | Â | D2% < 28Gy | Â | |
Ipsilateral parotid gland - PTVs | V10Gy < 45% | Medium | V15Gy < 45% | Medium |
V25Gy < 30% | Â | V30Gy < 30% | Â | |
V40Gy < 15% | Â | V45Gy < 15% | Â | |
 |  | Dmax < 50Gy |  | |
Controlateral parotid gland - PTVs | V10Gy < 45% | High | V15Gy < 45% | High |
V25Gy < 30% | Â | V30Gy < 30% | Â | |
V40Gy < 15% | Â | V45Gy < 15% | Â | |
 |  | Dmax < 50Gy |  | |
Mandible - PTVs | D5% < 55Gy | Medium | Dmax < 65Gy | Medium |
D50% < 30Gy | Â | D5% < 55Gy | Â | |
 |  | D50% < 30Gy |  | |
Larynx - PTVs | Dmax < 55Gy | Medium | Dmax < 55Gy | Medium |
D50% < 30Gy | Â | D50% < 30Gy | Â | |
D95% < 15Gy | Â | D95% < 15Gy | Â | |
Oral cavity - PTVs | Dmax < 55Gy | Medium | Dmax < 55Gy | Medium |
D50% < 30Gy | Â | D50% < 30Gy | Â | |
D95% < 15Gy | Â | D95% < 15Gy | Â | |
Ipsilateral sub-maxillary gland - PTVs | D30% < 50Gy | Medium | Dmax < 55Gy | Medium |
D50% < 30Gy | Â | D30% < 50Gy | Â | |
 |  | D50% < 30Gy |  | |
Controlateral sub-maxillary gland - PTVs | D30% < 50Gy | High | Dmax < 55Gy | High |
D50% < 30Gy | Â | D30% < 50Gy | Â | |
 |  | D50% < 30Gy |  |