A conceptual design of a partially shielded eBT source for D-RSBT: (a) 3D view and (b) cross section view.
TPS processes for D-RSBT method. The dose calculator generates a set of baseline beamlets based on the source tandem path and the user-specified parameters: the source step length Δλ, the baseline azimuthal emission angle δφ, and the zenith emission angle Δθ. Then the dose optimizer will generate an anchor plan which assigns a dwell time τ j, kδφ, δφ for each baseline beamlet. The dwell time sequence is the input for the optimal sequencer, and the optimal sequencer calculates the best way to approximately deliver the dose map specified by the anchor plan under the delivery time budget T. All the plans will be subject to plan evaluation.
Delivery efficiency curves for five clinical cases by using D-RSBT and S-RSBT with REAS. The anchor plans used by REAS are explicitly labeled with the corresponding azimuthal emission angles even if they are not on the delivery efficiency curves. IS + ICBT plans are also marked on the plot with help lines to indicate the corresponding HR-CTV D 90's and delivery times.
Azimuthal emission window size profiles for D-RSBT plans with corresponding EQD2 dose distributions for five cases. The delivery time selected for each case is the breakpoint on the delivery efficiency curves where the D 90's are about to drop down abruptly.
Azimuthal emission window size profiles of D-RSBT plans with corresponding EQD2 dose distributions for case #4 with different delivery times.
Dosimetric comparison for five patients between IS + ICBT, S-RSBT, and D-RSBT methods. The S-RSBT and D-RSBT were evaluated with (i) the D 90 from IS + ICBT matched (denoted by Match D 90); and (ii) or with delivery time budget set to 10, 20, and 30 min/fx more from what is need in IS + ICBT. The EQD2 values were computed with repair considered using Eq. (5) .
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