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000282361 1001_ $$aRippke, Carolin$$b0
000282361 245__ $$aLeaf-individual calibration for a double stack multileaf collimator in photon radiotherapy.
000282361 260__ $$aAmsterdam [u. a.]$$bElsevier Science$$c2023
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000282361 520__ $$aIn online adaptive stereotactic body radiotherapy treatments, linear accelerator delivery accuracy is essential. Recently introduced double stack multileaf collimators (MLCs) have new facets in their calibration. We established a radiation-based leaf-individual calibration (LIMCA) method for double stack MLCs.MLC leaf positions were evaluated from four cardinal angles with test patterns at measurement positions throughout the radiation field on EBT3 radiochromic film for each single stack. The accuracy of the method and repeatability of the results were assessed. The effect of MLC positioning errors was characterized for a measured output factor curve and a clinical patient plan.All positions in the motor step - position calibration file were optimized in the established LIMCA method. The resulting double stack mean accuracy for all angles was 0.2 ± 0.1 mm for X1 (left bank) and 0.2 ± 0.2 mm for X2 (right bank). The accuracy of the leaf position evaluation was 0.2 mm (95% confidence level). The MLC calibration remained stable over four months. Small MLC leaf position errors (e.g. 1.2 mm field size reduction) resulted in important dose errors (-5.8 %) for small quadratic fields of 0.83 × 0.83 cm2. Single stack position accuracy was essential for highly modulated treatment plans.LIMCA is a new double stack MLC calibration method that increases treatment accuracy from four angles and for all moving leaves.
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000282361 650_7 $$2Other$$aAdaptive radiotherapy
000282361 650_7 $$2Other$$aImage guided radiotherapy
000282361 650_7 $$2Other$$aMR-Linac
000282361 650_7 $$2Other$$aMR-guided radiotherapy
000282361 650_7 $$2Other$$aMultileaf collimator
000282361 650_7 $$2Other$$aPhoton radiotherapy
000282361 650_7 $$2Other$$aQuality assurance
000282361 650_7 $$2Other$$aQuality control
000282361 650_7 $$2Other$$aSmall field dosimetry
000282361 7001_ $$aRenkamp, C Katharina$$b1
000282361 7001_ $$aAttieh, Charbel$$b2
000282361 7001_ $$aSchlüter, Fabian$$b3
000282361 7001_ $$aBuchele, Carolin$$b4
000282361 7001_ $$0P:(DE-He78)8714da4e45acfa36ce87c291443a9218$$aDebus, Jürgen$$b5$$udkfz
000282361 7001_ $$aAlber, Markus$$b6
000282361 7001_ $$aKlüter, Sebastian$$b7
000282361 773__ $$0PERI:(DE-600)2963795-8$$a10.1016/j.phro.2023.100477$$gVol. 27, p. 100477 -$$p100477$$tPhysics & Imaging in Radiation Oncology$$v27$$x2405-6316$$y2023
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