Back to Search
Start Over
Helical tomotherapy optimized planning parameters for nasopharyngeal cancer
- Source :
- Journal of Physics: Conference Series. 694:012002
- Publication Year :
- 2016
- Publisher :
- IOP Publishing, 2016.
-
Abstract
- Helical TomoTherapy(HT) planning depends on optimize parameters including field width (FW), pitch factor (PF) and modulation factor (MF). These optimize parameters are effect to quality of plans and treatment time. The aim of this study was to find the optimized parameters which compromise between plan quality and treatment times. Six nasopharyngeal cancer patients were used. For each patient data set, 18 treatment plans consisted of different optimize parameters combination (FW=5.0, 2.5, 1.0 cm; PF=0.43, 0.287, 0.215; MF2.0, 3.0) were created. The identical optimization procedure followed ICRU83 recommendations. The average D50 of both parotid glands and treatment times per fraction were compared for all plans. The study show treatment plan with FW1.0 cm showed the lowest average D50 of both parotid glands. The treatment time increased inversely to FW. The FW1.0 cm the average treatment time was 4 times longer than FW5.0 cm. PF was very little influence on the average D50 of both parotid glands. Finally, MF increased from 2.0 to 3.0 the average D50 of both parotid glands was slightly decreased. However, the average treatment time was increased 22.28%. For routine nasopharyngeal cancer patients with HT, we suggest the planning optimization parameters consist of FW=5.0 cm, PF=0.43 and MF=2.0.
- Subjects :
- History
business.industry
medicine.medical_treatment
Pitch factor
Patient data
Tomotherapy
030218 nuclear medicine & medical imaging
Computer Science Applications
Education
Modulation factor
03 medical and health sciences
0302 clinical medicine
Treatment plan
030220 oncology & carcinogenesis
medicine
Treatment time
Nuclear medicine
business
Nasopharyngeal cancer
Subjects
Details
- ISSN :
- 17426596 and 17426588
- Volume :
- 694
- Database :
- OpenAIRE
- Journal :
- Journal of Physics: Conference Series
- Accession number :
- edsair.doi...........43f20747c8f77bdddd29b4030a751d9a