Introduction
General aspects
Virtual isocentre
Methods
Planning system and target definition
Evaluation parameters
Mean dose to spherical shells
Conformity index and gradient index
V66.7%
Planning details
Results
PCI
| Circular Collimator | MLC 0.5 cm (isocentric) | ||||||
---|---|---|---|---|---|---|---|---|
SID or SVID [cm] | 100 | 70 | 50 | 100 | 70 | 50 | ||
∅ [cm] | Prescription | |||||||
1.0 | D80% | 0.87 | 0.92 | 0.92 | 0.79 | 0.88 | 0.94 | |
1.3 | D70% | 0.88 | 0.92 | 0.93 | 0.85 | 0.89 | 0.93 | |
1.3 | D80% | 0.87 | 0.89 | 0.90 | 0.82 | 0.88 | 0.90 | |
1.3 | D90% | 0.85 | 0.83 | 0.84 | 0.85 | 0.86 | 0.86 | |
1.7 | D80% | 0.91 | 0.92 | 0.93 | 0.85 | 0.92 | 0.92 |
SID 100 vs. SVID 70/50
GI
| Circular Collimator | MLC 0.5 cm (isocentric) | ||||||
---|---|---|---|---|---|---|---|---|
SID or SVID [cm] | 100 | 70 | 50 | 100 | 70 | 50 | ||
∅ [cm] | Prescription | |||||||
1.0 | D80% | 3.90 | 3.45 | 3.20 | 4.21 | 3.74 | 3.63 | |
1.3 | D70% | 2.91 | 2.70 | 2.61 | 3.15 | 2.92 | 2.77 | |
1.3 | D80% | 3.26 | 2.83 | 2.78 | 3.57 | 3.22 | 3.01 | |
1.3 | D90% | 4.19 | 3.69 | 2.44 | 4.65 | 4.05 | 3.73 | |
1.7 | D80% | 2.86 | 2.63 | 2.52 | 3.15 | 2.85 | 2.69 |
Circular collimator vs. MLC
MLC at SVID 70/50 or optimal shape at SID 100?
Clinical relevance?
V66.7%
| Circular Collimator | MLC 0.5 cm (isocentric) | ||||||
---|---|---|---|---|---|---|---|---|
SID or SVID [cm] | 100 | 70 | 50 | 100 | 70 | 50 | ||
∅ [cm] | Prescription | |||||||
1.0 | D80% | 1.87 | 1.58 | 1.44 | 2.09 | 1.73 | 1.50 | |
1.3 | D70% | 3.01 | 2.62 | 2.44 | 3.30 | 2.87 | 2.57 | |
1.3 | D80% | 3.58 | 3.12 | 2.89 | 3.98 | 3.34 | 3.11 | |
1.3 | D90% | 4.62 | 4.22 | 3.88 | 5.06 | 4.28 | 4.00 | |
1.7 | D80% | 6.34 | 5.72 | 5.38 | 7.05 | 6.08 | 5.67 |