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SU‐FF‐T‐350: A Comparative Dosimetric Study of Three‐Dimensional Conformal, Dynamic Conformal Arc, and Intensity Modulated Radiation Therapy for Brain Tumor Treatment
Author(s) -
Ding M,
Newman F,
Stuhr K,
Johnson T
Publication year - 2005
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.1998079
Subject(s) - medicine , nuclear medicine , radiation therapy , dosimetry , conformal map , medical physics , radiology , mathematics , geometry
Purpose: To investigate dosimetric differences among three‐dimensional conformal (3D‐CRT), dynamic conformal arc therapy (DCAT) and intensity modulated radiotherapy (IMRT) for brain tumor treatment for a broad range of brain tumor volumes and shapes in an effort to determine whether a preferred method can be identified based upon pre‐treatment characteristics. Method and Materials: Fifteen patients treated with Novalis were selected. We performed 3D‐CRT, DCAT and IMRT plans for all the cases. The beam numbers in 3D‐CRT or IMRT plans were the same as the arc numbers in the DCAT plans, and the gantry angle of each beam in 3D‐CRT or IMRT plans was the middle angle of each arc in the DCAT plans. The PTV margin was re‐chosen as 1mm, and the specific prescription dose was re‐set to 90% for all the plans. The target coverage at prescription dose (TV 90% ), conformity index (CI) and heterogeneity index (HI) were used to compare the different plans. V 50% and V 80% of the organs at risk (OAR) were also calculated. Results: For small brain tumors (PTV⩽2cc), three dosimetric parameters had approximate values for both 3D‐CRT and DCAT plans (TV 90 %¯∼ 93 % ,CI ¯∼ 1.7 ,HI ¯∼ 1.4 ) . The CI for IMRT plans was high ( CI ¯= 3 ) . For medium brain tumors (2cc