Stereotactic radiotherapy using tomotherapy for early-stage non-small cell lung carcinoma: analysis of intrafraction tumour motion.

Introduction: Intrafraction tumour motion in helical tomotherapy was investigated by comparing pre-and mid-fraction CT scans in patients with early non-small cell lung carcinoma (NSCLC) to assess the efficacy of a 7-mm margin around gross tumour volumes (GTVs) in stereotactic body radiation therapy (SBRT). Methods: Thirty patients with early-stage NSCLC received SBRT in four or five fractions for a total of 141 treatments. A slow positron emission tomography/CT scan was fused with the simulation CT to determine the GTV. A planning target volume was created by placing an isotropic margin of 7 mm around the GTV. Data were retrospectively analyzed to assess translational tumour positional changes along the x, y and z axes and vector changes in millimeters from the pretreatment megavoltage (MV)-CT to the mid-fraction MV-CT. Results: Average movements for all 141 treatment days along the x, y and z axes were 0.5 +/- 2.3, -0.3 +/- 3.0 and 0.9 +/- 3.0 mm, respectively. Average movements for each patient along the x, y and z axes were 0.5 +/- 1.5, -0.2 +/- 2.0 and 0.9 +/- 1.9 mm, respectively. Average vector displacement was 4.3 +/- 2.4 mm for all treatment days and 4.2 +/- 1.7 mm for each patient. Of 141 treatments, 137 (97.2%) fell within 7.0 mm in all axes. Conclusion: The addition of a 7-mm margin to the GTV for patients receiving SBRT for NSCLC using tomotherapy is adequate to account for tumour movement. Mid-fraction CT scans proved to be valuable in assessing intrafraction tumour motion.