Fig 1.
The dose distributions for the (a) IMRT and (b) VMAT plans.
Table 1.
Description of modifications for treatment plan.
Fig 2.
Schematic diagram of EPID-based 3D in vivo dose reconstruction.
Fig 3.
Gamma consistency comparison between EPID reconstruction and TPS simulation.
(a) and (b) 2%/2 mm gamma results for Body and PTV structures, respectively. (c) and (d) 3%/3 mm gamma results for Body and PTV structures, respectively. The results were the average of the IMRT and VMAT plan results in both nonuniform and uniform simple phantoms.
Fig 4.
Gamma comparisons of EPID reconstruction dose between IMRT and VMAT treatment techniques.
(a) and (b) 2%/2 mm gamma results for Body and PTV structures, respectively. The dotted line represents a failure rate of 10% for the 2%/2 mm criteria. The results were the average of nonuniform and uniform phantoms.
Fig 5.
Gamma comparisons of EPID reconstruction dose between nonuniform and uniform simple phantoms.
(a) and (b) for 2%/2 mm gamma results for Body and PTV structures, respectively. The gamma results are the average of the results of the IMRT and VMAT plans.
Fig 6.
PTV DVH consistency comparison between EPID reconstruction and TPS simulation for MLC shift.
TPS simulation (left). EPID reconstruction (right).
Fig 7.
PTV DVH consistency comparison between EPID reconstruction and TPS simulation for Phantom shift, (a) TPS simulation. (b) EPID reconstruction.
Table 2.
Relative dose differences of D95, D50 and D5 between the Phantom shift plans and the original plans.
Fig 8.
PTV DVH consistency comparison between EPID reconstruction and TPS simulation for PTV deformation.
TPS simulation (left). EPID reconstruction (right).
Fig 9.
DVH consistency comparison of EPID reconstruction and CBCT-guided EPID reconstruction with TPS simulation for phantom left shift.
(a) TPS simulation. (b) CBCT-guided EPID reconstruction. (c) EPID reconstruction.
Table 3.
Gamma failure rate statistics of pure EPID reconstruction, CBCT-guided EPID reconstruction and TPS simulation for thoracic Phantom shift.