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Interfractional variations of tumor centroid position and tumor regression during stereotactic body radiotherapy for lung tumor.

Abstract：

PURPOSE:To determine interfractional changes of lung tumor centroid position and tumor regression during stereotactic body radiation therapy (SBRT). METHODS AND MATERIALS:34 patients were treated by SBRT in 4-5 fractions to a median dose of 50 Gy. The CT scans acquired for verification were registered with simulation CT scans. The gross target volume (GTV) was contoured on all verification CT scans and compared to the initial GTV in treatment plan system. RESULTS:The mean (±standard deviation, SD) three-dimension vector shift was 5.2 ± 3.1 mm. The mean (±SD) interfractional variations of tumor centroid position were -0.7 ± 4.5 mm in anterior-posterior (AP) direction, 0.2 ± 3.1 mm in superior-inferior (SI) direction, and 0.4 ± 2.4 mm in right-left (RL) direction. Large interfractional variations (≥5 mm) were observed in 5 fractions (3.3%) in RL direction, 16 fractions (10.5%) in SI direction, and 36 fractions (23.5%) in AP direction. Tumor volume did not decrease significantly during lung SBRT. CONCLUSIONS:Small but insignificant tumor volume regression was observed during lung SBRT. While the mean interfractional variations of tumor centroid position were minimal in three directions, variations more than 5 mm account for approximately a third of all, indicating additional margin for PTV, especially in AP direction.

journal_name

Biomed Res Int

journal_title

BioMed research international

authors

Sun Y,Lu Y,Cheng S,Guo W,Ye K,Zhao H,Zheng X,Li D,Wang S,Yang C,Ge H

doi

10.1155/2014/372738

subject

Has Abstract

pub_date

2014-01-01 00:00:00

pages

372738

eissn

2314-6133

issn

2314-6141

journal_volume

2014

pub_type

杂志文章

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