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Abstract

[Purpose]To evaluate feasibility and acute toxicities after dynamic tumour tracking (DTT) irradiation with real-time monitoring for lung tumours using a gimbal mounted linac. [Materials and methods]Spherical gold markers were placed around the tumour using a bronchoscope prior to treatment planning. Prescription dose at the isocentre was 56 Gy in 4 fractions for T2a lung cancer and metastatic tumour, and 48 Gy in 4 fractions for the others. Dose-volume metrics were compared between DTT and conventional static irradiation using in-house developed software. [Results]Of twenty-two patients enrolled, DTT radiotherapy was successfully performed for 16 patients, except 4 patients who coughed out the gold markers, one who showed spontaneous tumour regression, and one where the abdominal wall motion did not correlate with the tumour motion. Dose covering 95% volume of GTV was not different between the two techniques, while normal lung volume receiving 20 Gy or more was reduced by 20%. A mean treatment time per fraction was 36 min using DTT. With a median follow-up period of 13.2 months, no severe toxicity grade 3 or worse was observed. [Conclusions]DTT radiotherapy using a gimbal mounted linac was clinically feasible for lung treatment without any severe acute toxicity.

Journal

  • Radiotherapy and oncology : journal of the European Society for Therapeutic Radiology and Oncology

    Radiotherapy and oncology : journal of the European Society for Therapeutic Radiology and Oncology 112(3), 360-364, 2014-09

    Elsevier Ireland Ltd.

Codes

  • NII Article ID (NAID)
    120005522772
  • NII NACSIS-CAT ID (NCID)
    AA10476884
  • Text Lang
    ENG
  • Article Type
    journal article
  • ISSN
    0167-8140
  • Data Source
    IR 
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