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Dosimetric and Monte Carlo verification of jaws-only IMRT plans calculated by the Collapsed Cone Convolution algorithm for head and neck cancers
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Abstract
Aim
The aim of this study is to verify the Prowess Panther jaws-only intensity modulated radiation therapy (JO-IMRT) treatment planning (TP) by comparing the TP dose distributions for head-and-neck (H&N) cancer with the ones simulated by Monte Carlo (MC).
Background
To date, dose distributions planned using JO-IMRT for H&N patients were found superior to the corresponding three-dimensional conformal radiotherapy (3D-CRT) plans. Dosimetry of the JO-IMRT plans were also experimentally verified using an ionization chamber, MapCHECK 2, and Octavius 4D and good agreements were shown.
Materials and methods
Dose distributions of 15 JO-IMRT plans of nasopharyngeal patients were recalculated using the EGSnrc Monte Carlo code. The clinical photon beams were simulated using the BEAMnrc. The absorbed dose to patients treated by fixed-field IMRT was computed using the DOSXYZnrc. The simulated dose distributions were then compared with the ones calculated by the Collapsed Cone Convolution (CCC) algorithm on the TPS, using the relative dose error comparison and the gamma index using global methods implemented in PTW-VeriSoft with 3%/3mm, 2%/2mm, 1%/1mm criteria.
Results
There is a good agreement between the MC and TPS dose. The average gamma passing rates were 93.3±3.1%, 92.8±3.2%, 92.4±3.4% based on the 3%/3mm, 2%/2mm, 1%/1mm criteria, respectively.
Conclusions
According to the results, it is concluded that the CCC algorithm was adequate for most of the IMRT H&N cases where the target was not immediately adjacent to the critical structures.
Abstract
Aim
The aim of this study is to verify the Prowess Panther jaws-only intensity modulated radiation therapy (JO-IMRT) treatment planning (TP) by comparing the TP dose distributions for head-and-neck (H&N) cancer with the ones simulated by Monte Carlo (MC).
Background
To date, dose distributions planned using JO-IMRT for H&N patients were found superior to the corresponding three-dimensional conformal radiotherapy (3D-CRT) plans. Dosimetry of the JO-IMRT plans were also experimentally verified using an ionization chamber, MapCHECK 2, and Octavius 4D and good agreements were shown.
Materials and methods
Dose distributions of 15 JO-IMRT plans of nasopharyngeal patients were recalculated using the EGSnrc Monte Carlo code. The clinical photon beams were simulated using the BEAMnrc. The absorbed dose to patients treated by fixed-field IMRT was computed using the DOSXYZnrc. The simulated dose distributions were then compared with the ones calculated by the Collapsed Cone Convolution (CCC) algorithm on the TPS, using the relative dose error comparison and the gamma index using global methods implemented in PTW-VeriSoft with 3%/3mm, 2%/2mm, 1%/1mm criteria.
Results
There is a good agreement between the MC and TPS dose. The average gamma passing rates were 93.3±3.1%, 92.8±3.2%, 92.4±3.4% based on the 3%/3mm, 2%/2mm, 1%/1mm criteria, respectively.
Conclusions
According to the results, it is concluded that the CCC algorithm was adequate for most of the IMRT H&N cases where the target was not immediately adjacent to the critical structures.
Keywords
Intensity-modulated radiation therapy (IMRT); Jaws-only IMRT (JO-IMRT); Quality assurance (QA); Monte Carlo simulation (MC); CERR; DOSCTP
About this articleTitle
Dosimetric and Monte Carlo verification of jaws-only IMRT plans calculated by the Collapsed Cone Convolution algorithm for head and neck cancers
Journal
Reports of Practical Oncology and Radiotherapy
Issue
Pages
105-114
Published online
2019-01-01
DOI
10.1016/j.rpor.2018.11.004
Bibliographic record
Rep Pract Oncol Radiother 2019;24(1):105-114.
Keywords
Intensity-modulated radiation therapy (IMRT)
Jaws-only IMRT (JO-IMRT)
Quality assurance (QA)
Monte Carlo simulation (MC)
CERR
DOSCTP
Authors
Duong Thanh Tai
Luong Thi Oanh
Nguyen Dong Son
Truong Thi Loan
James C.L. Chow