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Figure 1 | Radiation Oncology

Figure 1

From: The sensitivity of gamma-index method to the positioning errors of high-definition MLC in patient-specific VMAT QA for SBRT

Figure 1

Three types of MLC misalignments introduced to each SBRT plan delivered with VMAT technique. The first type named as Class Out was a simulation that both multi-leaf collimators (MLCs) were opened (a) while the second type named as Class In was a simulation that both MLCs were closed (b). The third type named as Class Shift was a simulation that both MLC banks were shifted in the same direction toward ground. MLC misalignments of Class Shift during gantry rotation from 180° to 0° (c) and from 0° to 180° (d) in the IEC scale are shown.

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