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A multi-centre analysis of treatment procedures and error components in dynamic tumour tracking radiotherapy

Journal Contribution - Journal Article

PURPOSE: This study aimed to compare procedures for dynamic tumour tracking (DTT) using a gimbal-mounted linac between centres in Japan (KU-IBRI) and Belgium (UZB), to quantify tracking error (TE), and to estimate tumour-fiducial uncertainties and PTV margins.

METHODS: Twenty-two patients were evaluated. TE was divided into components originating from the patient, fraction, segment, and residuals.

RESULTS: KU-IBRI applied DTT to lung cancer, while UZB treated both the lung and liver. Patients 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. TE was larger at UZB in the intra-fraction components, whereas the tumour-fiducial uncertainties were estimated to be larger at KU-IBRI. These results ultimately led to similar PTV 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 patients).

CONCLUSION: Several differences in procedures and patient characteristics were observed that affected TE and tumour-fiducial uncertainties. This analysis confirmed similar accuracy in DTT delivery and adequate PTV margins in the different centres based on their local specific workflows.

Journal: Radiotherapy & Oncology
ISSN: 0167-8140
Issue: 3
Volume: 115
Pages: 412-418
Publication year:2015
  • ORCID: /0000-0002-5717-7136/work/61831480
  • ORCID: /0000-0001-9108-610X/work/60612463
  • WoS Id: 000358804600020
  • Scopus Id: 84946415670
CSS-citation score:1
Accessibility:Closed