To Determine the Gross Tumor Volume with CT Scan in End Expiration, Inspiration and All Phases of Respiration in Carcinoma Lung Patients
R Srivastava1*, P.K. Sharma1, P Sharma1, A Munshi2, M Chomal1, S Laishram1, G Saini1, (1) International Oncology Center,Fortis Hospital, Noida, U.P., (2) Fortis Memorial Research Institute, Gurgaon, HaryanaSU-E-J-217 Sunday 3:00PM - 6:00PM Room: Exhibit Hall
Purpose: The aim of this study was to compare the delineation and treatment planning of two phase- based (the end-expiration and the end-inspiration phases) IGTV (Internal Gross Tumor Volume) with ten-phase based (4D) IGTV.
Methods: Two patients with lung tumors at different sites were selected for the study.The location of the tumor in Patient A was at the upper lobe(attached to the chest wall) of the left lung.In patient B the location was the middle lobe of right lung.We contoured the GTV on each of the ten respiratory phases of the 4D-CT data set.The combination of these GTVs produced the IGTV
Results: IGTV <2Phases> (175cc)and IGTV
Conclusion: The study shows the patients with tumor in upper lobe have no difference in tumor coverage and OARs sparing in the EEI and 4DCT. However,tumors in middle lobe have a greater excursion during respiration and hence greater all phase IGTV.We suggest performing a 4D scan and EEI scan both,for these categories of patients in order to include the tumor excursion due to breathing
Funding Support, Disclosures, and Conflict of Interest: Conflict of Interest: Nil Funding Support: Required if possible
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