Colin lies down on the table, head nestled in a custom head rest that still contains long strands of the hair we had to cut off a week before. I help him settle into his spot, but he knows the drill better than I do. I straighten his head and the tech puts the mask in place. He closes his eyes under the plastic mesh without complaint and she rotates clips that keep it in firmly in place during treatment. They show me how they line him up, red lines crossing to match pen marks on his skin that they redraw over small tattooed dots and lines on the chin of the mask.
