|
KMID : 0364920110360010028
|
|
Journal of Radiation Protection and Research
2011 Volume.36 No. 1 p.28 ~ p.34
|
|
|
MU Fluence Reconstruction based-on Delivered Leaf Position: for IMRT Quality Assurance
|
|
Park So-Yeon
Park Yang-Kyun
Park Jong-Min
Choi Chang-Heon
Ye Sung-Joon
|
|
|
Abstract
|
|
|
|
The measurement-based verification for intensity modulated radiation therapy (IMRT) is a time-and labor-consuming procedure. Instead, this study aims to develop a MU fluence reconstruction method for IMRT QA. Total actual fluences from treatment planning system (TPS, Eclipse 8.6, Varian) were selected as a reference. Delivered leaf positions according to MU were extracted by the dynalog file generated after IMRT delivery. An in-house software was develop to reconstruct MU fluence from the acquired delivered leaf position data using MATLAB. We investigated five patient’s plans delivered by both step-and-shoot IMRT and sliding window technologies. The total actual fluence was compared with the MU fluence reconstructed by using commercial software (Verisoft 3.1, PTW) and gamma analysis method (criteria: 3%/3 ㎜ and 2%/1 ㎜). Gamma pass rates were 91.8±1.33% and the reconstructed fluence was shown good agreement with RTP-based actual fluence. The fluence from step and shoot IMRT was shown slightly higher agreement with the actual fluence than that from sliding window IMRT. If moving from IMRT QA measurements toward independent computer calculations, the developed method can be used for IMRT QA. A point dose calculation method from reconstructed fluences is under development for the routine IMRT QA purpose.
|
|
|
KEYWORD
|
|
|
MU fluence Reconstruction, DICOM RT file, Dynalog file, IMRT QA
|
|
|
FullTexts / Linksout information
|
|
|
|
|
|
Listed journal information
|
|
|