nocam - IGRT (Image Guided Radio Therapy) uses CT or other imaging to help direct the daily radiation to where the tumor IS now, not where it was. Not everyone has that - they did not have one where my husband was treated, so the doctors physically palpated his lymph node as a way of telling how the treatment was progressing.
CG to husband - SCC Tonsil T1N2M0 HPV+ Never Smoker First symptoms 7/2010, DX 12/2010 TX 40 IRMT (1.8 gy) + 10 Cetuximab PET Scans 6/2011 + 3/2012 clear, 5 year physical exam clear; chest CT's clear of cancer. On thyroid pills. Life is good.