Open AccessTarget coverage of daily cone-beam computed tomography in breath-hold image-guided radiotherapy for gastric lymphoma
Author(s) -
Shojiro Takahashi,
Takamasa Nishide,
Masato Tsuzuki,
Hiroki Katayama,
Masahide Anada,
Toshiro Kinoshita,
Shohei Kozai,
Toru Shibata
Publication year - 2021
Publication title -
bjr|open
Language(s) - English
Resource type - Journals
ISSN - 2513-9878
DOI - 10.1259/bjro.20200062
Subject(s) - image guided radiation therapy , medicine , cone beam computed tomography , nuclear medicine , radiation therapy , computed tomography , lymphoma , cone beam ct , radiology , stomach
Objectives: We evaluated retrospectively the daily target coverage using cone-beam computed tomography (CBCT) in breath-hold image-guided radiotherapy (BH-IGRT) for gastric lymphoma. Methods: BH-IGRT was performed using a prescribed dose of 30.6 Gy in 17 fractions for the whole stomach. We assessed the target coverage of the whole stomach on daily CBCT images [daily clinical target volume (CTV)], which was delineated individually by two observers. We evaluated V 95% (percentage of volume receiving ≥95% of the prescribed dose) of daily CTV. Results: In total, 102 fractions from 6 patients were assessed. The mean V 95% of daily CTV was 97.2%, which was over 95%. In two of six patients, the V 95% of daily CTV was over 95% for either observer in all fractions. One patient had significant interobserver variation ( p = 0.013). In 95 fractions (93%), the V 95% of daily CTV was over 95% for either observer. Conclusion: Daily target coverage for CTV in BH-IGRT for gastric lymphoma seems to be favorable, even when using CBCT. Advances in knowledge: A previous study ascertained good daily target coverage in BH-IGRT for gastric lymphoma using in-room CT. Even when using CBCT in our study, daily target coverage for CTV in BH-IGRT for gastric lymphoma seems to be favorable.