Whole neck IMRT with isodose distribution for case no. 2 with display of high risk PTV 70 and standard risk PTV 56.
AP LAN field of case no. 8 treated to 56 Gy using match line feathering in 1 cm intervals with four IMRT segments. The rightmost digitally reconstructed radiograph (DRR) is the last segment in which the cord is blocked.
DVH curves of PRVs and PTVs for case no. 9 for the grid resolution parameter. Notes: (1) medium solid curve represents 2 mm dose/fluence grid, thin solid curve represents 4 mm dose/fluence grid, and dashed curve represents 4 mm dose grid with 2 mm fluence grid, (2) flu., fluence.
Mean (a) and (b) and maximum (c) and (d) percentage dose differences for all PRVs and PTVs with varying MSAP (a) and (c) and MMUP (b) and (d) for all cases. Notes: (1) The max is the max magnitude of plan quality degradation being a negative sign for D20% and D99% and a positive sign for all other structures. (2) Reference taken at 3 MU, 4 cm2.
Percentage dose differences averaged over all PRVs and PTVs with varying MMUSAP for all cases. Notes: (1) Only D20% is shown for PTV results due to sign convention. (2) Reference taken at 3 MU, 4 cm2.
Treatment delivery time model tested against 33 delivered IMRT plans with calculated times from our model and a modified Li and Xing (Ref. 20 ) model. Notes: (1) The modified Li and Xing (Ref. 20 ) model includes two additional terms for beam-on delay and auto-field-sequence mode delay. (2) Measured times delivered on an Elekta LINAC.
Percentage difference in treatment delivery time, number of segments, and plan MU for the 3 MU, 4 cm2 reference plan versus plans of varying sizes of MSAP (a) and MMUP (b) for all cases.
Breakdown of trials for each case.
Summary of diagnosis and plan information for the 11 head and neck cases in this study.
ROIs (regions of interest) with expansions and dose goals for all cases.
Inputs, parameters, and outputs for treatment delivery time model.
PRV and PTV dose differences for grid resolution parameter.
Planning calculation time and total plan MU for grid resolution parameter.
Delivery time model parameters of an Elekta LINAC compared to vendor specifications.
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