Development of a head and neck Phantom for remote-audit program of IMRT treatment

Youngyih Han; Sae Byeong Lee; Eun Hyuk Shin; Jae Kyun Kim; Sang Gyu Ju; Myonggeun Yoon; Yong Chan Ahn; Chunil Lim; Hee Kyo Jeong; Hun Jin Oh

doi:10.1007/978-3-540-36841-0_507

Development of a head and neck Phantom for remote-audit program of IMRT treatment

Youngyih Han, Sae Byeong Lee, Eun Hyuk Shin, Jae Kyun Kim, Sang Gyu Ju, Myonggeun Yoon, Yong Chan Ahn, Chunil Lim, Hee Kyo Jeong, Hun Jin Oh

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

1 Citation (Scopus)

Abstract

Purpose: Accurate delivery of the most-up-todate treatment techniques such as Intensity-modulated radiation therapy (IMRT) is essential. In order to conduct a remoteaudit program, which allows evaluation of institution’s accuracy in delivering IMRT, an anthropomorphic phantom has been designed and constructed. The dosimetric characteristics in the phantom were investigated. Method: The phantom has a shape of a cylinder with one target and three organ-at-risks (OARs) inside. The target and OARs were shaped analogous to those of nasopharynx cancer patients and were manufactured to be able to detect with CT images. Inside the target and OARs, TLD holders were inserted for absolute dose measurements. The phantom allows measurements with thimble chambers at the TLD locations, thereby affording an inter-comparison between two dosimeters. For the measurement of relative dose distribution across the target and OARs, two film slots were orthogonally placed near the center of phantom, which also enables inhomogeneity insertion near the target. Measurement with TLDs and IC were done for three cases. The first was an anterior one port 6MV X-ray (Primus, Siemens, USA) delivery to the phantom; the second was the same beam geometrically, but with inhomogeneties inserted, and the third was IMRT delivery to the phantom without inhomogeneities. For each case, four sets of TLDs were used to reduce the statistical uncertainty. Results: In anterior one port X-ray delivery to homogeneous phantom, the deviation between the IC and TLD measurements normalized to IC dose, ranged from 1.13% to 3.9%. With inhomogeneous insertion, the range increased to 2.7%- 3.3%. In IMRT delivery, the differences between IC and TLD measurements were 3.7-5.6%. Standard deviation of TLD measurements were small, ranging from 0.4% to 1.2%. Conclusion: Our preliminary results show the developed phantom allows the measurements with TLDs and IC within 4% uncertainty. More investigation is necessary to reduce the uncertainty range.

Original language	English
Title of host publication	IFMBE Proceedings
Editors	Sun I. Kim, Tae Suk Suh
Publisher	Springer Verlag
Pages	2020-2023
Number of pages	4
Edition	1
ISBN (Print)	9783540368397
DOIs	https://doi.org/10.1007/978-3-540-36841-0_507
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

ASJC Scopus subject areas

Bioengineering
Biomedical Engineering

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10.1007/978-3-540-36841-0_507

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Han, Y., Lee, S. B., Shin, E. H., Kim, J. K., Ju, S. G., Yoon, M., Ahn, Y. C., Lim, C., Jeong, H. K., & Oh, H. J. (2007). Development of a head and neck Phantom for remote-audit program of IMRT treatment. In S. I. Kim, & T. S. Suh (Eds.), IFMBE Proceedings (1 ed., pp. 2020-2023). (IFMBE Proceedings; Vol. 14, No. 1). Springer Verlag. https://doi.org/10.1007/978-3-540-36841-0_507

Development of a head and neck Phantom for remote-audit program of IMRT treatment. / Han, Youngyih; Lee, Sae Byeong; Shin, Eun Hyuk; Kim, Jae Kyun; Ju, Sang Gyu; Yoon, Myonggeun; Ahn, Yong Chan; Lim, Chunil; Jeong, Hee Kyo; Oh, Hun Jin.

IFMBE Proceedings. ed. / Sun I. Kim; Tae Suk Suh. 1. ed. Springer Verlag, 2007. p. 2020-2023 (IFMBE Proceedings; Vol. 14, No. 1).

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

Han, Y, Lee, SB, Shin, EH, Kim, JK, Ju, SG, Yoon, M, Ahn, YC, Lim, C, Jeong, HK & Oh, HJ 2007, Development of a head and neck Phantom for remote-audit program of IMRT treatment. in SI Kim & TS Suh (eds), IFMBE Proceedings. 1 edn, IFMBE Proceedings, no. 1, vol. 14, Springer Verlag, pp. 2020-2023, 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_507

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abstract = "Purpose: Accurate delivery of the most-up-todate treatment techniques such as Intensity-modulated radiation therapy (IMRT) is essential. In order to conduct a remoteaudit program, which allows evaluation of institution{\textquoteright}s accuracy in delivering IMRT, an anthropomorphic phantom has been designed and constructed. The dosimetric characteristics in the phantom were investigated. Method: The phantom has a shape of a cylinder with one target and three organ-at-risks (OARs) inside. The target and OARs were shaped analogous to those of nasopharynx cancer patients and were manufactured to be able to detect with CT images. Inside the target and OARs, TLD holders were inserted for absolute dose measurements. The phantom allows measurements with thimble chambers at the TLD locations, thereby affording an inter-comparison between two dosimeters. For the measurement of relative dose distribution across the target and OARs, two film slots were orthogonally placed near the center of phantom, which also enables inhomogeneity insertion near the target. Measurement with TLDs and IC were done for three cases. The first was an anterior one port 6MV X-ray (Primus, Siemens, USA) delivery to the phantom; the second was the same beam geometrically, but with inhomogeneties inserted, and the third was IMRT delivery to the phantom without inhomogeneities. For each case, four sets of TLDs were used to reduce the statistical uncertainty. Results: In anterior one port X-ray delivery to homogeneous phantom, the deviation between the IC and TLD measurements normalized to IC dose, ranged from 1.13% to 3.9%. With inhomogeneous insertion, the range increased to 2.7%- 3.3%. In IMRT delivery, the differences between IC and TLD measurements were 3.7-5.6%. Standard deviation of TLD measurements were small, ranging from 0.4% to 1.2%. Conclusion: Our preliminary results show the developed phantom allows the measurements with TLDs and IC within 4% uncertainty. More investigation is necessary to reduce the uncertainty range.",

author = "Youngyih Han and Lee, {Sae Byeong} and Shin, {Eun Hyuk} and Kim, {Jae Kyun} and Ju, {Sang Gyu} and Myonggeun Yoon and Ahn, {Yong Chan} and Chunil Lim and Jeong, {Hee Kyo} and Oh, {Hun Jin}",

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AU - Han, Youngyih

AU - Lee, Sae Byeong

AU - Shin, Eun Hyuk

AU - Kim, Jae Kyun

AU - Ju, Sang Gyu

AU - Yoon, Myonggeun

AU - Ahn, Yong Chan

AU - Lim, Chunil

AU - Jeong, Hee Kyo

AU - Oh, Hun Jin

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N2 - Purpose: Accurate delivery of the most-up-todate treatment techniques such as Intensity-modulated radiation therapy (IMRT) is essential. In order to conduct a remoteaudit program, which allows evaluation of institution’s accuracy in delivering IMRT, an anthropomorphic phantom has been designed and constructed. The dosimetric characteristics in the phantom were investigated. Method: The phantom has a shape of a cylinder with one target and three organ-at-risks (OARs) inside. The target and OARs were shaped analogous to those of nasopharynx cancer patients and were manufactured to be able to detect with CT images. Inside the target and OARs, TLD holders were inserted for absolute dose measurements. The phantom allows measurements with thimble chambers at the TLD locations, thereby affording an inter-comparison between two dosimeters. For the measurement of relative dose distribution across the target and OARs, two film slots were orthogonally placed near the center of phantom, which also enables inhomogeneity insertion near the target. Measurement with TLDs and IC were done for three cases. The first was an anterior one port 6MV X-ray (Primus, Siemens, USA) delivery to the phantom; the second was the same beam geometrically, but with inhomogeneties inserted, and the third was IMRT delivery to the phantom without inhomogeneities. For each case, four sets of TLDs were used to reduce the statistical uncertainty. Results: In anterior one port X-ray delivery to homogeneous phantom, the deviation between the IC and TLD measurements normalized to IC dose, ranged from 1.13% to 3.9%. With inhomogeneous insertion, the range increased to 2.7%- 3.3%. In IMRT delivery, the differences between IC and TLD measurements were 3.7-5.6%. Standard deviation of TLD measurements were small, ranging from 0.4% to 1.2%. Conclusion: Our preliminary results show the developed phantom allows the measurements with TLDs and IC within 4% uncertainty. More investigation is necessary to reduce the uncertainty range.

AB - Purpose: Accurate delivery of the most-up-todate treatment techniques such as Intensity-modulated radiation therapy (IMRT) is essential. In order to conduct a remoteaudit program, which allows evaluation of institution’s accuracy in delivering IMRT, an anthropomorphic phantom has been designed and constructed. The dosimetric characteristics in the phantom were investigated. Method: The phantom has a shape of a cylinder with one target and three organ-at-risks (OARs) inside. The target and OARs were shaped analogous to those of nasopharynx cancer patients and were manufactured to be able to detect with CT images. Inside the target and OARs, TLD holders were inserted for absolute dose measurements. The phantom allows measurements with thimble chambers at the TLD locations, thereby affording an inter-comparison between two dosimeters. For the measurement of relative dose distribution across the target and OARs, two film slots were orthogonally placed near the center of phantom, which also enables inhomogeneity insertion near the target. Measurement with TLDs and IC were done for three cases. The first was an anterior one port 6MV X-ray (Primus, Siemens, USA) delivery to the phantom; the second was the same beam geometrically, but with inhomogeneties inserted, and the third was IMRT delivery to the phantom without inhomogeneities. For each case, four sets of TLDs were used to reduce the statistical uncertainty. Results: In anterior one port X-ray delivery to homogeneous phantom, the deviation between the IC and TLD measurements normalized to IC dose, ranged from 1.13% to 3.9%. With inhomogeneous insertion, the range increased to 2.7%- 3.3%. In IMRT delivery, the differences between IC and TLD measurements were 3.7-5.6%. Standard deviation of TLD measurements were small, ranging from 0.4% to 1.2%. Conclusion: Our preliminary results show the developed phantom allows the measurements with TLDs and IC within 4% uncertainty. More investigation is necessary to reduce the uncertainty range.

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