Variations of target volume definition and daily target volume localization in stereotactic body radiotherapy for early-stage non-small cell lung cancer patients under abdominal compression.

We aimed to compare gross tumor volumes (GTV) in 3-dimensional computed tomography (3DCT) simulation and daily cone beam CT (CBCT) with the internal target volume (ITV) in 4-dimensional CT (4DCT) simulation in stereotactic body radiotherapy (SBRT) treatment of patients with early-stage non-small cell lung cancer (NSCLC) under abdominal compression. We retrospectively selected 10 patients with NSCLC who received image-guided SBRT treatments under abdominal compression with daily CBCT imaging. GTVs were contoured as visible gross tumor on the planning 3DCT and daily CBCT, and ITVs were contoured using maximum intensity projection (MIP) images of the planning 4DCT.

Dosimetric study of volumetric modulated arc therapy fields for total marrow irradiation.

Background And Purpose: Normal organ toxicity is the leading factor that limits dose escalation in total body irradiation for bone marrow transplant (BMT) patients. In recent years, total marrow irradiation (TMI) using the helical tomotherapy (HT) system is being used as a more targeted form of TBI to treat BMT patients. In this study, we evaluated the feasibility of using volumetric modulated arc therapy (VMAT) to deliver TMI treatment.