Leaf-individual calibration for a double stack multileaf collimator in photon radiotherapy.

ABSTRACT:

Background and purpose

In online adaptive stereotactic body radiotherapy treatments, linear accelerator delivery accuracy is essential. Recently introduced double stack multileaf collimators (MLCs) have new facets in their calibration. We established a radiation-based leaf-individual calibration (LIMCA) method for double stack MLCs.

Materials and methods

MLC leaf positions were evaluated from four cardinal angles with test patterns at measurement positions throughout the radiation field on EBT3 radiochromic film for each single stack. The accuracy of the method and repeatability of the results were assessed. The effect of MLC positioning errors was characterized for a measured output factor curve and a clinical patient plan.

Results

All positions in the motor step - p

SUBMITTER: Rippke C 

PROVIDER: S-EPMC10457557 | biostudies-literature | 2023 Jul

REPOSITORIES: biostudies-literature