TY - JOUR
T1 - Improvement in the accuracy of respiratory-gated radiation therapy using a respiratory guiding system
AU - Kang, Seong Hee
AU - Kim, Dong Su
AU - Kim, Tae Ho
AU - Suh, Tae Suk
AU - Yoon, Jai Woong
N1 - Funding Information:
This program was supported by the program of the Basic Atomic Energy Research Institute (BAERI) which is part of the Nuclear R and D programs (No. 20120004886) funded by the Ministry of Education, Science and Technology (MEST) and by a grant (2012-007883) from the Mid-career Researcher Program funded by the MEST of Korea.
PY - 2013
Y1 - 2013
N2 - The accuracy of respiratory-gated radiation therapy (RGRT) depends on the respiratory regularity because external respiratory signals are used for gating the radiation beam at particular phases. Many studies have applied a respiratory guiding system to improve the respiratory regularity. This study aims to evaluate the effect of an in-house-developed respiratory guiding system to improve the respiratory regularity for RGRT. To verify the effectiveness of this system, we acquired respiratory signals from five volunteers. The improvement in respiratory regularity was analyzed by comparing the standard deviations of the amplitudes and the periods between free and guided breathing. The reduction in residual motion at each phase was analyzed by comparing the standard deviations of sorted data within each corresponding phase bin as obtained from free and guided breathing. The results indicate that the respiratory guiding system improves the respiratory regularity, and that most of the volunteers showed significantly less average residual motion at each phase. The average residual motion measured at phases of 40, 50, and 60%, which showed lower variation than other phases, were, respectively, reduced by 41, 45, and 44% during guided breathing. The results show that the accuracy of RGRT can be improved by using the in-house-developed respiratory guiding system. Furthermore, this system should reduce artifacts caused by respiratory motion in 4D CT imaging.
AB - The accuracy of respiratory-gated radiation therapy (RGRT) depends on the respiratory regularity because external respiratory signals are used for gating the radiation beam at particular phases. Many studies have applied a respiratory guiding system to improve the respiratory regularity. This study aims to evaluate the effect of an in-house-developed respiratory guiding system to improve the respiratory regularity for RGRT. To verify the effectiveness of this system, we acquired respiratory signals from five volunteers. The improvement in respiratory regularity was analyzed by comparing the standard deviations of the amplitudes and the periods between free and guided breathing. The reduction in residual motion at each phase was analyzed by comparing the standard deviations of sorted data within each corresponding phase bin as obtained from free and guided breathing. The results indicate that the respiratory guiding system improves the respiratory regularity, and that most of the volunteers showed significantly less average residual motion at each phase. The average residual motion measured at phases of 40, 50, and 60%, which showed lower variation than other phases, were, respectively, reduced by 41, 45, and 44% during guided breathing. The results show that the accuracy of RGRT can be improved by using the in-house-developed respiratory guiding system. Furthermore, this system should reduce artifacts caused by respiratory motion in 4D CT imaging.
KW - Residual motion
KW - Respiratory guiding system
KW - Respiratory regularity
KW - Respiratory-gated radiation therapy
UR - http://www.scopus.com/inward/record.url?scp=84872764347&partnerID=8YFLogxK
U2 - 10.3938/jkps.62.159
DO - 10.3938/jkps.62.159
M3 - Article
AN - SCOPUS:84872764347
SN - 0374-4884
VL - 62
SP - 159
EP - 164
JO - Journal of the Korean Physical Society
JF - Journal of the Korean Physical Society
IS - 1
ER -