Fig 1.
MLC position errors are introduced to each SBRT plan.
(a) baseline plan; (b)(c) Type1, shift error; (d)Type2, opening error; (e)Type3, closing error; (f)Type4, random error.
Fig 2.
A sample dose–volume histogram of patient 5.
This figure shows A sample DVH of the PTV, left lung, lung, heart, and spinal cord for the baseline plan and different simulation plans with an MLC position error of 2 mm for each case. 2(a) IMRT plans; 2(b) VMAT plans.
Fig 3.
The percentage changes for CI, GI, and D2cm for all types of MLC position errors in IMRT plans and VMAT plans.
3(a) CI decreased with increasing MLC error; 3(b) the relative percentage change of GI compared to each type of MLC error; 3(c) the relative percentage change of D2cm compared to each type of MLC error.
Fig 4.
The gEUD variation in the PTV caused by MLC errors.
4(a) The gEUD variation in IMRT plans. 4(b) The gEUD variation in VMAT plans.
Table 1.
The gEUD variation in the OAR of the IMRT and VMAT plan for shift error.
Table 2.
The gEUD variation in the OAR of the IMRT and VMAT plan for opening error.
Table 3.
The gEUD variation in the OAR of the IMRT and VMAT plan for closing error.
Table 4.
The gEUD variation in the OAR of the IMRT and VMAT plan for random error.
Table 5.
Dose sensitivity analysis of MLC error to PTV and OAR in IMRT and VMAT plans.
Fig 5.
Frequency histogram of all windows formed by MLC leaf pairs during dynamic window delivery of all IMRT and VMAT plans.