Actually, the mask is to hold my head in a consistent position from treatment to treatment. I had the mask and the precision CT scan this afternoon. Getting the mask fitted was weird. The CT scan was boring, like always. On the positive side, if I didn't get the mask, they would give me alignment tattoos in order to get the positioning correct. I consider myself lucky I get to have the mask. (incidentally, I get to keep the mask. Pictures of the mask will come after my next appointment on the 25th.)
You walk into the CT room and they have the giant plain donut there with the table in front of it. There is a hot water bath off to a side and this plastic-wrapped thingy that looks like a giant purple fly swatter without a handle. There is a white plastic horseshoe-shaped frame and the middle is all purple plastic mesh.
First step is to stretch you out on the table and they put a semi-solid and slightly wet pillow under your head. It molds to the back of your head and they kind of push it up against your noggin from the sides until it hardens. After that, they spend about ten minutes moving the table with the digital controls. They have a laser alignment system that projects some crosshairs onto your face (remember kids: Do not look into laser aperture with remaining eyeball!) which they use for a rough position. Then comes the fun.
They give you the obligatory "okay, don't move!" command, and then the two of 'em bring over the purple fly swatter from the 160
o water (!). The open end of the horseshoe goes over your neck, the white frame goes around your head and the purple stuff streeeeeetttttccchhes over your face... whereupon they bolt the plastic to the table you're laying on. It's actually not all that hot. It wasn't uncomfortable at all, mainly because I'm not claustrophobic.
So there you lay, stretched out on a hard plastic pneumatic table with a cooling purple flyswatter stretched over your face, and they wait for it to cool. You can, with a bit of effort, open your eyes and look out through the purple mesh. It's not entirely unlike being trapped in a whiffle ball, I suppose. I had this intense urge to grab a machete and start terrorizing teenage campers.
Anyhow, they wrap some cool towels around you and then remove the mask. Because of where my lymphoma is, they cut away a portion of the mask around where my eyeball is and then reattached the mask over my face (and again with the clamping the frame down to the table). Right about now, I'm spouting off nonsense just to pass the time. I personally think my best one-liner is when I said "Someday! Someday I will escape and the throne of France will be mine!".
[shrug] They got it. Or at least they were polite enough to laugh.
Now that I'm all nice and immobile, my radiologist shows up and places what he tells me is a sticky BB on my eye, which they will use for targeting. What he doesn't tell me (possibly because he didn't find me funny enough) is that the sticky part is very sticky and is hanging on to my eyelashes. The part where they pulled that off was not pleasant. It stung a bit. Not terrible, but sharp pains a millimeter away from my eyeball gives me pause. Once I'm all trussed up, they roll me into the CT scanner (finally) and take some high definition shots of my eyeball. Out I go, off comes the mask, and I bounce up from the table and ready to fight rush hour traffic.
I did schedule my future appointments! A week from Friday (the 25th) is the deadline for the radiologist and hospital staff to have a treatment plan finalized. The estimate is that each session will probably include three different angles. I actually start getting irradiated on the following Monday. Being a bit of a masochist, I asked them to schedule me at 0730 every day so I can get there early, get done and then go to work immediately afterwards. I'm such a dweeb.