Radiation Dose Optimization in Diffuse Large B- Cell Lymphoma.

Radiation will be started within 3-4 weeks of completion of chemotherapy. Computed Tomography (CT)scan will be acquired for treatment planning, which will be done using External Beam Planning System. The target volumes will be defined by clinical examination, staging Positron Emission Tomography with CT (PET-CT) and response PET-CT. The staging PET-CT will be fused and co-registered with the planning CT scans for target volume delineation. For Involved Field Radiotherapy,Clinical target volume (CTV) will include the entire nodal region depending on the site involved. For Involved Site RT , CTV will include the involved nodal volume in the staging PET-CT. For extranodal sites, the CTV will include the involved extranodal region as per the staging PET-CT. The total dose will be prescribed to the Planning Target Volume based on dose uniformity guidelines. All patients will be treated with 3 Dimensional Conformal Radiotherapy or Intensity Modulated Radiotherapy where indicated.

Radiation will be started within 3-4 weeks of completion of chemotherapy. Computed Tomography (CT)scan will be acquired for treatment planning, which will be done using External Beam Planning System. The target volumes will be defined by clinical examination, staging Positron Emission Tomography with CT (PET-CT) and response PET-CT. The staging PET-CT will be fused and co-registered with the planning CT scans for target volume delineation. For Involved Field Radiotherapy,Clinical target volume (CTV) will include the entire nodal region depending on the site involved. For Involved Site RT,CTV will include the involved nodal volume in the staging PET-CT. For extranodal sites, the CTV will include the involved extranodal region as per the staging PET-CT. The total dose will be prescribed to the Planning Target Volume based on dose uniformity guidelines. All patients will be treated with 3 Dimensional Conformal Radiotherapy or Intensity Modulated Radiotherapy where indicated.