A multi-centre analysis of treatment procedures and error components in XXXX tracking radiotherapy.

@entity1 @entity5 @entity2 @entity343 @entity2246
PURPOSE: This study aimed to compare procedures for @entity5 tracking (DTT) using a gimbal-mounted linac between centres in Japan (KU-IBRI) and Belgium (UZB), to quantify @entity2246 ( @entity2246 ), and to estimate @entity5 -fiducial uncertainties and @entity343 margins. METHODS: Twenty-two @entity1 were evaluated. @entity2246 was divided into components originating from the @entity1 , fraction, segment, and residuals. RESULTS: KU-IBRI applied DTT to @entity2 , while UZB treated both the lung and liver. @entity1 from UZB were younger and had a higher body mass index. DTT procedures differed in the use of body fixation, correction for set-up error, type of fiducial markers, and goodness of fit of correlation model. @entity2246 was larger at UZB in the intra-fraction components, whereas the @entity5 -fiducial uncertainties were estimated to be larger at KU-IBRI. These results ultimately led to similar @entity343 margins at both centres (2.1, 4.2, and 2.6mm for KU-IBRI; 2.4, 3.6, and 2.0mm for UZB in LR, AP, and SI, respectively, for 99% coverage of @entity1 ). CONCLUSION: Several differences in procedures and @entity1 characteristics were observed that affected @entity2246 and @entity5 -fiducial uncertainties. This analysis confirmed similar accuracy in DTT delivery and adequate @entity343 margins in the different centres based on their local specific workflows.
