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

Autor:	Drexell Hunter, Boggs, Steven, Feigenberg, Robert, Walter, Dennis, Wissing, Bijal, Patel, Terry, Wu, Lane, Rosen
Rok vydání:	2014
Předmět:	Aged 80 and over Male Lung Neoplasms Reproducibility of Results Middle Aged Radiotherapy Setup Errors Radiosurgery Sensitivity and Specificity Patient Positioning Motion Imaging Three-Dimensional Treatment Outcome Carcinoma Non-Small-Cell Lung Humans Female Dose Fractionation Radiation Radiotherapy Intensity-Modulated Tomography X-Ray Computed Aged Neoplasm Staging Radiotherapy Image-Guided
Zdroj:	Journal of medical imaging and radiation oncology. 58(6)
ISSN:	1754-9485
Popis:	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).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.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.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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=pmid________::4d1e0e3de6a7b21a16e63df0c1a15bae https://pubmed.ncbi.nlm.nih.gov/24767098 Zobrazit plný text záznamu Plný text ve formátu PDF Plný text ve formátu HTML
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