Abstract
Beam delivery errors during intensity modulated radiotherapy (IMRT) were detected based on a simple constancy check of the transit dose by using an electronic portal imaging device (EPID). Twenty-one IMRT plans were selected from various treatment sites, and the transit doses during treatment were measured by using an EPID. Transit doses were measured 11 times for each course of treatment, and the constancy check was based on gamma index (3%/3 mm) comparisons between a reference dose map (the first measured transit dose) and test dose maps (the following ten measured dose maps). In a simulation using an anthropomorphic phantom, the average passing rate of the tested transit dose was 100% for three representative treatment sites (head & neck, chest, and pelvis), indicating that IMRT was highly constant for normal beam delivery. The average passing rate of the transit dose for 1224 IMRT fields from 21 actual patients was 97.6% ± 2.5%, with the lower rate possibly being due to inaccuracies of patient positioning or anatomic changes. An EPIDbased simple constancy check may provide information about IMRT beam delivery errors during treatment.
| Original language | English |
|---|---|
| Pages (from-to) | 1876-1881 |
| Number of pages | 6 |
| Journal | Journal of the Korean Physical Society |
| Volume | 67 |
| Issue number | 10 |
| DOIs | |
| Publication status | Published - 2015 Nov 1 |
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Keywords
- EPID
- In vivo dosimetry
- Intensity modulated radiation therapy
- Transit dose
ASJC Scopus subject areas
- Physics and Astronomy(all)
Cite this
Detection of IMRT delivery errors based on a simple constancy check of transit dose by using an EPID. / Baek, Tae Seong; Chung, Eun Ji; Son, Jaeman; Yoon, Myonggeun.
In: Journal of the Korean Physical Society, Vol. 67, No. 10, 01.11.2015, p. 1876-1881.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Detection of IMRT delivery errors based on a simple constancy check of transit dose by using an EPID
AU - Baek, Tae Seong
AU - Chung, Eun Ji
AU - Son, Jaeman
AU - Yoon, Myonggeun
PY - 2015/11/1
Y1 - 2015/11/1
N2 - Beam delivery errors during intensity modulated radiotherapy (IMRT) were detected based on a simple constancy check of the transit dose by using an electronic portal imaging device (EPID). Twenty-one IMRT plans were selected from various treatment sites, and the transit doses during treatment were measured by using an EPID. Transit doses were measured 11 times for each course of treatment, and the constancy check was based on gamma index (3%/3 mm) comparisons between a reference dose map (the first measured transit dose) and test dose maps (the following ten measured dose maps). In a simulation using an anthropomorphic phantom, the average passing rate of the tested transit dose was 100% for three representative treatment sites (head & neck, chest, and pelvis), indicating that IMRT was highly constant for normal beam delivery. The average passing rate of the transit dose for 1224 IMRT fields from 21 actual patients was 97.6% ± 2.5%, with the lower rate possibly being due to inaccuracies of patient positioning or anatomic changes. An EPIDbased simple constancy check may provide information about IMRT beam delivery errors during treatment.
AB - Beam delivery errors during intensity modulated radiotherapy (IMRT) were detected based on a simple constancy check of the transit dose by using an electronic portal imaging device (EPID). Twenty-one IMRT plans were selected from various treatment sites, and the transit doses during treatment were measured by using an EPID. Transit doses were measured 11 times for each course of treatment, and the constancy check was based on gamma index (3%/3 mm) comparisons between a reference dose map (the first measured transit dose) and test dose maps (the following ten measured dose maps). In a simulation using an anthropomorphic phantom, the average passing rate of the tested transit dose was 100% for three representative treatment sites (head & neck, chest, and pelvis), indicating that IMRT was highly constant for normal beam delivery. The average passing rate of the transit dose for 1224 IMRT fields from 21 actual patients was 97.6% ± 2.5%, with the lower rate possibly being due to inaccuracies of patient positioning or anatomic changes. An EPIDbased simple constancy check may provide information about IMRT beam delivery errors during treatment.
KW - EPID
KW - In vivo dosimetry
KW - Intensity modulated radiation therapy
KW - Transit dose
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U2 - 10.3938/jkps.67.1876
DO - 10.3938/jkps.67.1876
M3 - Article
AN - SCOPUS:84948650047
VL - 67
SP - 1876
EP - 1881
JO - Journal of the Korean Physical Society
JF - Journal of the Korean Physical Society
SN - 0374-4884
IS - 10
ER -