Evaluation of image-guided and surface-guided radiotherapy for breast cancer patients treated in deep inspiration breath-hold: A single institution experience

被引:19
|
作者
Penninkhof, Joan [1 ]
Fremeijer, Kimm [1 ]
Harten, Kirsten Offereins-van [1 ]
van Wanrooij, Cynthia [1 ]
Quint, Sandra [1 ]
Kunnen, Britt [1 ]
Hoffmans-Holtzer, Nienke [1 ]
Swaak, Annemarie [1 ]
Baaijens, Margreet [1 ]
Dirkx, Maarten [1 ]
机构
[1] Erasmus MC, Canc Inst, Dept Radiat Oncol, Dr Molewaterpl 40, NL-3015 GD Rotterdam, Netherlands
来源
TECHNICAL INNOVATIONS & PATIENT SUPPORT IN RADIATION ONCOLOGY | 2022年 / 21卷
关键词
Breath; -hold; Surface -guided radiotherapy; DIBH; Breast; REPRODUCIBILITY; IRRADIATION; STABILITY; ACCURACY; SETUP; DIBH;
D O I
10.1016/j.tipsro.2022.02.001
中图分类号
R73 [肿瘤学];
学科分类号
100214 ;
摘要
Introduction: Nowadays, deep inspiratory breath-hold is a common technique to reduce heart dose in left-sided breast radiotherapy. This study evaluates the evolution of the breath-hold technique in our institute, from portal imaging during dose delivery to continuous monitoring with surface-guided radiotherapy (SGRT). Materials and methods: Setup data and portal imaging results were analyzed for 98 patients treated before 2014, and SGRT data for 228 patients treated between 2018 and 2020. For the pre-SGRT group, systematic and random setup errors were calculated for different correction protocols. Residual errors and reproducibility of breathholds were evaluated for both groups. The benefit of using SGRT for initial positioning was evaluated for another cohort of 47 patients. Results: Online correction reduced the population mean error from 3.9 mm (no corrections) to 1.4 mm. Despite online setup correction, deviations greater than 3 mm were observed in about 10% and 20% of the treatment beams in ventral-dorsal and cranial-caudal directions, respectively. However, these percentages were much smaller than with offline protocols or no corrections. Mean absolute differences between breath-holds within a fraction were smaller in the SGRT-group (1.69 mm) than in the pre-SGRT-group (2.10 mm), and further improved with addition of visual feedback (1.30 mm). SGRT for positioning did not improve setup accuracy, but slightly reduced the time for imaging and setup correction, allowing completion within 3.5 min for 95% of fractions. Conclusion: For accurate radiotherapy breast treatments using deep inspiration breath-hold, daily imaging and correction is required. SGRT provides accurate information on patient positioning during treatment and improves patient compliance with visual feedback.
引用
收藏
页码:51 / 57
页数:7
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