Fig. 1

Lymph node response assessment via Cone Beam CT (CBCT) daily setup imaging versus diagnostic CT. A Representative patient images demonstrating CC, ML and AP measurements at CT simulation (upper panel) and End of Treatment CBCT (lower panel). B Representative patient images demonstrating Complete Response (upper), Partial Response (middle) and Stable Disease (lower) with CC measurements taken at Pre-Treatment CT simulation, End of Treatment CBCT and 3 month post-RT