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000286704 1001_ $$aRenkamp, C. K.$$b0
000286704 245__ $$aEvaluation of 2D ion chamber arrays for patient specific quality assurance using a static phantom at a 0.35 T MR-Linac.
000286704 260__ $$aAmsterdam [u.a.]$$bElsevier$$c2025
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000286704 520__ $$aPatient specific quality assurance (QA) in MR-Linacs can be performed with MR-compatible ion chamber arrays. However, the presence of a static magnetic field can alter the angular response of such arrays substantially. This works investigates the suitability of two ion chamber arrays, an air-filled and a liquid-filled array, for patient specific QA at a 0.35 T MR-Linac using a static phantom.In order to study the angular response, the two arrays were placed in a static, solid phantom and irradiated with 9.96 × 9.96 cm2 fields every 10° beam angle at a 0.35 T MR-Linac. Measurements were compared to the TPS calculated dose in terms of gamma passing rate and relative dose to the central chamber. 20 patient specific quality assurance plans were measured using the liquid-filled array.The air-filled array showed asymmetric angular response changes of central chamber dose of up to 18% and down to local 3 mm / 3% gamma rates of 20%, while only minor differences within 3% (excluding parallel irradiation and beams through the couch edges) were found for the liquid-filled ion chamber array without rotating the phantom. Patient plan QA using the liquid-filled array yielded a median local 3 mm / 3% 3D gamma passing rate of 99.8% (range 96.9%-100%).A liquid-filled ionization chamber array in combination with a static phantom can be used for efficient patient specific plan QA in a single measurement set-up in a 0.35 T MR-Linac, while the air-filled ion chamber array phantom shows large angular response changes and has its limitations regarding patient specific QA measurements.
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000286704 650_7 $$2Other$$aMR-Linac
000286704 650_7 $$2Other$$aion chamber array
000286704 650_7 $$2Other$$apatient specific quality assurance
000286704 7001_ $$aEulenstein, D.$$b1
000286704 7001_ $$aSebald, M.$$b2
000286704 7001_ $$aSchlüter, F.$$b3
000286704 7001_ $$aBuchele, C.$$b4
000286704 7001_ $$aRippke, C.$$b5
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000286704 7001_ $$aKlüter, S.$$b7
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