en Radiation Oncology Radiation Oncology تحقيق بديع Original Research <p><strong>Background:</strong> Identify the optimal technique of radiotherapy for patients with high grade glioma. Our initial year of experience with RapidArc radiation therapy. <strong>Materials and Methods:</strong> Planning CT scans of 50 patients with grade IV glioma were reviewed and three plan sets by 3D Conformal Radiotherapy (3DCRT), Intensity Modulated Radiotherapy (IMRT) and Rapid Arc (RA) were generated and the plans were compared. <strong>Results:</strong> Planning target Volume (PTV) coverage is comparable. However IMRT and RA give better sparing of critical structures. Treatment time and Monitor Units (MU) for Rapid Arc is much less compared to IMRT. <strong>Conclusion:</strong> If PTV is near to the Organs at Risk (OAR), then IMRT gives good result in comparison to 3DCRT plans. Rapid Arc is faster than IMRT and 3DCRT for same dose prescription to PTV and constraints of OAR.</p> High grade glioma, radiotherapy planning, organ at risk, planning target volume, 3D conformal radiotherapy, intensity modulated radiotherapy, Rapid Arc 203 206 http://ijrr.com/browse.php?a_code=A-10-1-474&slc_lang=en&sid=1 B. Goswami brijeshccs@rediffmail.com 790031947532846007524 790031947532846007524 Yes Department of Radiation Oncology, Apollo Gleneagles Cancer Hospital, Kolkata, India S. Mitra 790031947532846007525 790031947532846007525 No Department of Radiation Oncology, Apollo Gleneagles Cancer Hospital, Kolkata, India S. Banerjee 790031947532846007526 790031947532846007526 No Department of Radiation Oncology, Apollo Gleneagles Cancer Hospital, Kolkata, India A. Shiva B 790031947532846007527 790031947532846007527 No Department of Radiation Oncology, Apollo Gleneagles Cancer Hospital, Kolkata, India P. Nagendran 790031947532846007528 790031947532846007528 No Department of Radiation Oncology, Apollo Gleneagles Cancer Hospital, Kolkata, India P. Kumari 790031947532846007529 790031947532846007529 No Department of Radiation Oncology, Apollo Gleneagles Cancer Hospital, Kolkata, India P. Goswami 790031947532846007530 790031947532846007530 No Medical Physicist, Department of Radiotherapy, Command Hospital, Lucknow, India A. Chakraborty 790031947532846007531 790031947532846007531 No Department of Radiation Oncology, Apollo Gleneagles Cancer Hospital, Kolkata, India S. Mukherjee 790031947532846007532 790031947532846007532 No Department of Radiation Oncology, Apollo Gleneagles Cancer Hospital, Kolkata, India