Document Type: Original Paper
Ibn-Alhaitham Teaching Hospital
Department of phsiology and medical physics, college of medicine, Alnahrain university, Iraq
University of Baghdad /Ministry of Health and Environment, Baghdad Center for Radiation Therapy and Nuclear Medicine
Physiology department , college of medicine , Al-Mustansiriyah University
Physics Unit , Baghdad Center for Radiotherapy and Nuclear Medicine , Ministry of Health and Environment , Baghdad, Iraq
Physicist unit, medical ‎city,Baghdad Center ‎for radiotherapy and ‎nuclear medicine , Ministry of health and ‎environment.
Introduction:more complicated techniques are emerging with rapid involvement in technology for accurate coverage of tumors by prescribed radiation dose with excellent sparing of normal organs from scattered radiation dose.SS-IMRT technique are one of those newly used techniques.QA of the treatment plan used for every treatment plan.OCTAVIUS4D-1500 detector phantom is one of the new devices for getting the plan quality.This study aimed at test SS-IMRT planning with OCTAVIUS4D-1500 detector phantom to see if the device is reliable, dependable and sturdy.Materials and Method:Thirty cases had QA for IMRT in Baghdad center for radiotherapy and nuclear medicine. Treatment plans were done for two regions: HN,and pelvis carcinoma by using the SS-IMRT technique. They prepared with the energy of 6 MV in the MONACO 5.1 TPS.These treatment plans were applied to OCTAVIUS 4D-1500 and were compared with an actual QA of it under LINAC, and calculating γ-index by “Verisoft 7.1” program of OCTAVIUS4D-1500 to evaluate IMRT plan which is being administered by 80-leaf MLC ELEKTA’s LINAC.Results:a major difference between the calculated and measured dose distribution for HN and pelvic plans and also the treated site is not affecting the gamma passing rate results.Global γ-analysis is higher than local γ-analysis regardless of study criteria.The HN plans had a better significant difference than the pelvic plans. HN plans show a strong significant correlation for total fields' area with%GP for both global and local,while they were significant in local%GP for the pelvic plans only.Conclusion: the measured dose distribution is significantly different from calculated once. the overall fields’ area relationship results are inverse with %GP.HN plans showed a powerful significant correlation for total fields' area with%GP for both global and local, while the pelvic plans showed a correlation in local%GP only.The OCTAVIUS 4D-1500 detector phantom might be enthusiastic about checking the QA of LINAC for the SS-IMRT technique