TY  - JOUR
AU  - Rippke, Carolin
AU  - Renkamp, C Katharina
AU  - Attieh, Charbel
AU  - Schlüter, Fabian
AU  - Buchele, Carolin
AU  - Debus, Jürgen
AU  - Alber, Markus
AU  - Klüter, Sebastian
TI  - Leaf-individual calibration for a double stack multileaf collimator in photon radiotherapy.
JO  - Physics & Imaging in Radiation Oncology
VL  - 27
SN  - 2405-6316
CY  - Amsterdam [u. a.]
PB  - Elsevier Science
M1  - DKFZ-2023-01745
SP  - 100477
PY  - 2023
AB  - 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.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.All positions in the motor step - position calibration file were optimized in the established LIMCA method. The resulting double stack mean accuracy for all angles was 0.2 ± 0.1 mm for X1 (left bank) and 0.2 ± 0.2 mm for X2 (right bank). The accuracy of the leaf position evaluation was 0.2 mm (95
KW  - Adaptive radiotherapy (Other)
KW  - Image guided radiotherapy (Other)
KW  - MR-Linac (Other)
KW  - MR-guided radiotherapy (Other)
KW  - Multileaf collimator (Other)
KW  - Photon radiotherapy (Other)
KW  - Quality assurance (Other)
KW  - Quality control (Other)
KW  - Small field dosimetry (Other)
LB  - PUB:(DE-HGF)16
C6  - pmid:37635846
C2  - pmc:PMC10457557
DO  - DOI:10.1016/j.phro.2023.100477
UR  - https://inrepo02.dkfz.de/record/282361
ER  -