Dosimetric verification of dynamic conformal arc radiotherapy using the optimization algorithm

Dongho Shin; Tae Hyun Kim; Doo Hyun Lee; Sung Yong Park; Myonggeun Yoon; Kyung Hwan Shin; Hong Ryull Pyo; Joo Young Kim; Dae Yong Kim; Kwan Ho Cho

doi:10.1007/978-3-540-36841-0_447

Dosimetric verification of dynamic conformal arc radiotherapy using the optimization algorithm

Dongho Shin, Tae Hyun Kim, Doo Hyun Lee, Sung Yong Park, Myonggeun Yoon, Kyung Hwan Shin, Hong Ryull Pyo, Joo Young Kim, Dae Yong Kim, Kwan Ho Cho

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Abstract

The purpose of this study is to develop the optimization method for adjusting the shift of film isocenter and to suggest the quantitative criteria for film dosimetry after optimization in the dynamic conformal arc radiation therapy (DCAR). The DCAR planning was performed with 10 patients of brain metastasis. Both absolute dosimetry with ion chamber and relative film dosimetry were performed throughout the. An optimization method for obtaining the global minimum was used to adjust the error due to the shift of film isocenter, which consists of the largest part of systematic errors. The average difference of point dose between measured value using ion chamber and calculated value acquired from planning system was 0.56±0.36% and maximum reached 1.14% with absolute dosimetry. The mean of dose difference before and after optimization was 1.79±0.34% and 1.44±0.33%, respectively and the average of percentage showing over 5% dose difference were 5.61±3.69% and 0.32±0.51%, respectively. After optimization, the dose differences decreased dramatically and the percentage showing over 5% dose difference and average dose difference was less than 2%. Our results show that this optimization method is effective in adjusting the error in isocenter and the quantitative criteria is accurate and useful in clinical application of dosimetric verification using film dosimetry.

Original language	English
Title of host publication	IFMBE Proceedings
Editors	Sun I. Kim, Tae Suk Suh
Publisher	Springer Verlag
Pages	1804-1807
Number of pages	4
Edition	1
ISBN (Print)	9783540368397
DOIs	https://doi.org/10.1007/978-3-540-36841-0_447
Publication status	Published - 2007
Externally published	Yes
Event	10th World Congress on Medical Physics and Biomedical Engineering, WC 2006 - Seoul, Korea, Republic of Duration: 2006 Aug 27 → 2006 Sep 1

Publication series

Name	IFMBE Proceedings
Number	1
Volume	14
ISSN (Print)	1680-0737
ISSN (Electronic)	1433-9277

Other

Other	10th World Congress on Medical Physics and Biomedical Engineering, WC 2006
Country	Korea, Republic of
City	Seoul
Period	06/8/27 → 06/9/1

Keywords

Criteria
DCAR QA
Film dosimetry
Optimization
Patient specific

ASJC Scopus subject areas

Bioengineering
Biomedical Engineering

Access to Document

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Shin, D., Kim, T. H., Lee, D. H., Park, S. Y., Yoon, M., Shin, K. H., Pyo, H. R., Kim, J. Y., Kim, D. Y., & Cho, K. H. (2007). Dosimetric verification of dynamic conformal arc radiotherapy using the optimization algorithm. In S. I. Kim, & T. S. Suh (Eds.), IFMBE Proceedings (1 ed., pp. 1804-1807). (IFMBE Proceedings; Vol. 14, No. 1). Springer Verlag. https://doi.org/10.1007/978-3-540-36841-0_447

Dosimetric verification of dynamic conformal arc radiotherapy using the optimization algorithm. / Shin, Dongho; Kim, Tae Hyun; Lee, Doo Hyun; Park, Sung Yong; Yoon, Myonggeun; Shin, Kyung Hwan; Pyo, Hong Ryull; Kim, Joo Young; Kim, Dae Yong; Cho, Kwan Ho.

IFMBE Proceedings. ed. / Sun I. Kim; Tae Suk Suh. 1. ed. Springer Verlag, 2007. p. 1804-1807 (IFMBE Proceedings; Vol. 14, No. 1).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Shin, D, Kim, TH, Lee, DH, Park, SY, Yoon, M, Shin, KH, Pyo, HR, Kim, JY, Kim, DY & Cho, KH 2007, Dosimetric verification of dynamic conformal arc radiotherapy using the optimization algorithm. in SI Kim & TS Suh (eds), IFMBE Proceedings. 1 edn, IFMBE Proceedings, no. 1, vol. 14, Springer Verlag, pp. 1804-1807, 10th World Congress on Medical Physics and Biomedical Engineering, WC 2006, Seoul, Korea, Republic of, 06/8/27. https://doi.org/10.1007/978-3-540-36841-0_447

Shin, Dongho ; Kim, Tae Hyun ; Lee, Doo Hyun ; Park, Sung Yong ; Yoon, Myonggeun ; Shin, Kyung Hwan ; Pyo, Hong Ryull ; Kim, Joo Young ; Kim, Dae Yong ; Cho, Kwan Ho. / Dosimetric verification of dynamic conformal arc radiotherapy using the optimization algorithm. IFMBE Proceedings. editor / Sun I. Kim ; Tae Suk Suh. 1. ed. Springer Verlag, 2007. pp. 1804-1807 (IFMBE Proceedings; 1).

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abstract = "The purpose of this study is to develop the optimization method for adjusting the shift of film isocenter and to suggest the quantitative criteria for film dosimetry after optimization in the dynamic conformal arc radiation therapy (DCAR). The DCAR planning was performed with 10 patients of brain metastasis. Both absolute dosimetry with ion chamber and relative film dosimetry were performed throughout the. An optimization method for obtaining the global minimum was used to adjust the error due to the shift of film isocenter, which consists of the largest part of systematic errors. The average difference of point dose between measured value using ion chamber and calculated value acquired from planning system was 0.56±0.36% and maximum reached 1.14% with absolute dosimetry. The mean of dose difference before and after optimization was 1.79±0.34% and 1.44±0.33%, respectively and the average of percentage showing over 5% dose difference were 5.61±3.69% and 0.32±0.51%, respectively. After optimization, the dose differences decreased dramatically and the percentage showing over 5% dose difference and average dose difference was less than 2%. Our results show that this optimization method is effective in adjusting the error in isocenter and the quantitative criteria is accurate and useful in clinical application of dosimetric verification using film dosimetry.",

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AB - The purpose of this study is to develop the optimization method for adjusting the shift of film isocenter and to suggest the quantitative criteria for film dosimetry after optimization in the dynamic conformal arc radiation therapy (DCAR). The DCAR planning was performed with 10 patients of brain metastasis. Both absolute dosimetry with ion chamber and relative film dosimetry were performed throughout the. An optimization method for obtaining the global minimum was used to adjust the error due to the shift of film isocenter, which consists of the largest part of systematic errors. The average difference of point dose between measured value using ion chamber and calculated value acquired from planning system was 0.56±0.36% and maximum reached 1.14% with absolute dosimetry. The mean of dose difference before and after optimization was 1.79±0.34% and 1.44±0.33%, respectively and the average of percentage showing over 5% dose difference were 5.61±3.69% and 0.32±0.51%, respectively. After optimization, the dose differences decreased dramatically and the percentage showing over 5% dose difference and average dose difference was less than 2%. Our results show that this optimization method is effective in adjusting the error in isocenter and the quantitative criteria is accurate and useful in clinical application of dosimetric verification using film dosimetry.

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