Dose response of a radiophotoluminescent glass dosimeter for TomoTherapy, CyberKnife, and flattening-filter-free linear accelerator output measurements in dosimetry audit

Mizuno, Hideyuki; Yamashita, Wataru; Okuyama, Hiroaki; Takase, Nobuhiro; Tohyama, Naoki; Shimizu, Hidetoshi; Fujita, Yukio; Kito, Satoshi; Nakaji, Taku; Fukuda, Satoshi

doi:10.1016/j.ejmp.2021.06.010

Cited by 6 publications

(1 citation statement)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…RPLD readings were taken on a FGD-1000 (AGC Techno Glass Co., LD, Shizuoka, Japan) and

was calculated using the following formula. 18 , 19 Where

is the reading of the i -th RPLD,

is the sensitivity correction factor of the i -th RPLD,

is the background value the i' -th RPLD,

is the RPLD calibration constant at the reference line quality,

is the correction factor for the radiation quality,

is the correction factor for the phantom material,

is the correction factor of nonlinearity, and

is the correction factor by flattening-filter-free (FFF) of CK.…”

Section: Methodsmentioning

confidence: 99%

Evaluation of a New Method for CyberKnife Treatment for Central Lung and Mediastinal Tumors by Tracheobronchial Tracking

Suzuki,

Saito,

Takahashi

et al. 2024

Technol Cancer Res Treat

View full text Add to dashboard Cite

Background CyberKnife treatment for central lung tumors and mediastinal tumors can be difficult to perform with marker less. Purpose We aimed to evaluate a novel tracheobronchial-based method (ie, tracheobronchial tracking) for the purpose of minimally invasive CyberKnife treatment for central lung and mediastinal tumors. Methods Five verification plans were created using an in-house phantom. Each plan included five irradiation sessions. The reference plan irradiated and tracked the simulated tumor (using the target tracking volume, TTV). Trachea plans tracked the simulated tracheo-bronchus and irradiated the simulated tumor and included two types of subplans: correlated plans in which the displacement of the simulated tracheobronchial and the simulated tumor were correlated, and non-correlated plans in which these factors were not correlated. Moreover, 15 mm and 25 mm TTVs were evaluated for each plan. The sin waveform and the patient's respiratory waveform were prepared as the respiratory model. Evaluations were performed by calculating the dose difference between the radiophotoluminescent glass dosimeter (RPLD)-generated mean dose values (generated by the treatment planning system, TPS) and the actual absorbed RPLD dose. Statistical analyses were performed to evaluate findings for each plan. Correlation and prediction errors were calculated for each axis of each plan using log files to evaluate tracking accuracy. Results Dose differences were statistically significant only in comparisons with the non-correlated plan. When evaluated using the sin waveform, the mean values for correlation and prediction errors in each axis and for all plans were less than 0.6 mm and 0.1 mm, respectively. In the same manner, they were less than 1.1 mm and 0.2 mm when evaluated using the patient's respiratory waveform. Conclusion Our newly-developed tracheobronchial tracking method would be useful in facilitating minimally invasive CyberKnife treatment in certain cases of central lung and mediastinal tumors.

show abstract