Optimized matching of film dosimetry with calculated doses for IMRT quality assurance

Dong Hyun Park; Dongho Shin; Sung Yong Park; Dahl Park; Tae Hyun Kim; Kyung Hwan Shin; Myonggeun Yoon; Dae Yong Kim; Kwan Ho Cho

doi:10.1016/j.ejmp.2007.03.001

Optimized matching of film dosimetry with calculated doses for IMRT quality assurance

Dong Hyun Park, Dongho Shin, Sung Yong Park, Dahl Park, Tae Hyun Kim, Kyung Hwan Shin, Myonggeun Yoon, Dae Yong Kim, Kwan Ho Cho

Research output: Contribution to journal › Article › peer-review

3 Citations (Scopus)

Abstract

We develop a new method with a global optimization for registering films to calculate doses for intensity-modulated radiation therapy (IMRT) and intensity-modulated radiosurgery (IMRS) quality assurance (QA). Both absolute point dosimetry and two-dimensional (2D) film dosimetry are performed through the IMRT and IMRS using Clinac 21EX's 120 millenium MLC and BrainLab's micro-MLC, respectively. The measured and calculated dose distributions are superimposed by coincidence of their origins, followed by comparison of the point doses at all matched positions. Then, with the optimization algorithm the setup error of the dosimeter is corrected. An example of IMRT cases shows that the average percentage showing 3% of dose difference for 10 patients has been reduced from 19% to 9%, before and after optimization and weight, respectively. Similar results are obtained for IMRS. This method dramatically reduces the difference between measured and calculated dose distributions in all cases investigated.

Original language	English
Pages (from-to)	49-57
Number of pages	9
Journal	Physica Medica
Volume	23
Issue number	2
DOIs	https://doi.org/10.1016/j.ejmp.2007.03.001
Publication status	Published - 2007 Jun
Externally published	Yes

Keywords

Film dosimetry
Intensity-modulated radiation therapy
Optimization algorithm
Quality assurance

ASJC Scopus subject areas

Biophysics
Radiology Nuclear Medicine and imaging
Physics and Astronomy(all)

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10.1016/j.ejmp.2007.03.001

Cite this

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title = "Optimized matching of film dosimetry with calculated doses for IMRT quality assurance",

abstract = "We develop a new method with a global optimization for registering films to calculate doses for intensity-modulated radiation therapy (IMRT) and intensity-modulated radiosurgery (IMRS) quality assurance (QA). Both absolute point dosimetry and two-dimensional (2D) film dosimetry are performed through the IMRT and IMRS using Clinac 21EX's 120 millenium MLC and BrainLab's micro-MLC, respectively. The measured and calculated dose distributions are superimposed by coincidence of their origins, followed by comparison of the point doses at all matched positions. Then, with the optimization algorithm the setup error of the dosimeter is corrected. An example of IMRT cases shows that the average percentage showing 3% of dose difference for 10 patients has been reduced from 19% to 9%, before and after optimization and weight, respectively. Similar results are obtained for IMRS. This method dramatically reduces the difference between measured and calculated dose distributions in all cases investigated.",

keywords = "Film dosimetry, Intensity-modulated radiation therapy, Optimization algorithm, Quality assurance",

author = "Park, {Dong Hyun} and Dongho Shin and Park, {Sung Yong} and Dahl Park and Kim, {Tae Hyun} and Shin, {Kyung Hwan} and Myonggeun Yoon and Kim, {Dae Yong} and Cho, {Kwan Ho}",

year = "2007",

month = jun,

doi = "10.1016/j.ejmp.2007.03.001",

language = "English",

volume = "23",

pages = "49--57",

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publisher = "Associazione Italiana di Fisica Medica",

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T1 - Optimized matching of film dosimetry with calculated doses for IMRT quality assurance

AU - Park, Dong Hyun

AU - Shin, Dongho

AU - Park, Sung Yong

AU - Park, Dahl

AU - Kim, Tae Hyun

AU - Shin, Kyung Hwan

AU - Yoon, Myonggeun

AU - Kim, Dae Yong

AU - Cho, Kwan Ho

PY - 2007/6

Y1 - 2007/6

N2 - We develop a new method with a global optimization for registering films to calculate doses for intensity-modulated radiation therapy (IMRT) and intensity-modulated radiosurgery (IMRS) quality assurance (QA). Both absolute point dosimetry and two-dimensional (2D) film dosimetry are performed through the IMRT and IMRS using Clinac 21EX's 120 millenium MLC and BrainLab's micro-MLC, respectively. The measured and calculated dose distributions are superimposed by coincidence of their origins, followed by comparison of the point doses at all matched positions. Then, with the optimization algorithm the setup error of the dosimeter is corrected. An example of IMRT cases shows that the average percentage showing 3% of dose difference for 10 patients has been reduced from 19% to 9%, before and after optimization and weight, respectively. Similar results are obtained for IMRS. This method dramatically reduces the difference between measured and calculated dose distributions in all cases investigated.

AB - We develop a new method with a global optimization for registering films to calculate doses for intensity-modulated radiation therapy (IMRT) and intensity-modulated radiosurgery (IMRS) quality assurance (QA). Both absolute point dosimetry and two-dimensional (2D) film dosimetry are performed through the IMRT and IMRS using Clinac 21EX's 120 millenium MLC and BrainLab's micro-MLC, respectively. The measured and calculated dose distributions are superimposed by coincidence of their origins, followed by comparison of the point doses at all matched positions. Then, with the optimization algorithm the setup error of the dosimeter is corrected. An example of IMRT cases shows that the average percentage showing 3% of dose difference for 10 patients has been reduced from 19% to 9%, before and after optimization and weight, respectively. Similar results are obtained for IMRS. This method dramatically reduces the difference between measured and calculated dose distributions in all cases investigated.

KW - Film dosimetry

KW - Intensity-modulated radiation therapy

KW - Optimization algorithm

KW - Quality assurance

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JO - Physica Medica

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ER -

Optimized matching of film dosimetry with calculated doses for IMRT quality assurance

Abstract

Keywords

ASJC Scopus subject areas

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