Potential for interfraction motion to increase esophageal toxicity in lung SBRT Journal Article
| Authors: | Pham, A. H. N.; Yorke, E.; Rimner, A.; Wu, A. J. C. |
| Article Title: | Potential for interfraction motion to increase esophageal toxicity in lung SBRT |
| Abstract: | Purpose: To characterize the effect of the relative motion of esophagus and tumor on radiation doses to the esophagus in patients treated with stereotactic body radiation therapy for central lung tumors. Methods and Materials: Fifty fractions of stereotactic body radiation therapy in 10 patients with lung tumors within 2.5 cm of the esophagus were reviewed. The esophagus was delineated on each treatment’s cone-beam computed tomography scan and compared to its position on the planning scan. Dose–volume histograms were calculated using the original treatment beams to determine the actual dose delivered to the esophagus for each fraction of stereotactic body radiation therapy. Results: Median interfraction right–left shift of the esophagus was 0.9 mm (range, −5.4 to 3.3 mm) toward the left. Median interfraction anteroposterior shift was 0.7 mm (range, −3.7 to 11.5 mm) posteriorly. The median percentage increase in dose to 1 cm3, dose to 3.5 cm3, and dose to 5 cm3 was 1.7%, 5.6%, and 6.6%, respectively. Two cases of significant late esophageal toxicity were observed, with change in esophageal position relative to the planning target volume resulting in significantly higher D5cc values than anticipated. Conclusion: Interfraction shifts between the internal target volume and esophagus can lead to unanticipated increases in the volume of esophagus receiving high doses when treating central lung tumors with stereotactic body radiation therapy. Certain practical steps, such as considering deep breath hold for internal target volume reduction, using a planning risk volume for esophagus, and carefully visualizing and considering esophageal position at the time of stereotactic body radiation therapy, can be taken to minimize unanticipated dose increases that could cause unexpected esophageal toxicity. © The Author(s) 2017. |
| Keywords: | adult; clinical article; aged; middle aged; fistula; treatment planning; radiation dose; follow up; neoplasm; computer assisted tomography; tumor volume; esophagitis; lung tumor; lung metastasis; dosimetry; cancer size; bile duct carcinoma; stereotactic body radiation therapy; colon; esophagus; cone beam computed tomography; histogram; anisotropy; sbrt; organ motion; esophagus toxicity; esophageal toxicity; human; male; female; article |
| Journal Title: | Technology in Cancer Research & Treatment |
| Volume: | 16 |
| Issue: | 6 |
| ISSN: | 1533-0346 |
| Publisher: | Sage Publications, Inc. |
| Date Published: | 2017-12-01 |
| Start Page: | 935 |
| End Page: | 943 |
| Language: | English |
| DOI: | 10.1177/1533034617711353 |
| PROVIDER: | scopus |
| PMCID: | PMC5640496 |
| PUBMED: | 28573929 |
| DOI/URL: | |
| Notes: | Article -- Export Date: 1 February 2018 -- Source: Scopus |
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