A Ss recently exclaimed that the pictures in our MIRECC.05 study were "foggy." I tried them out for a few minutes and found that, sure enough, the left eye fogged up. I wonder how many other Ss have experienced this to some degree but didn't report it. Any recommendations for reducing fog?
Also, on a post by Chuck Michelich pm 10/3/2003, he suggested that "It may be worth instructing subjects to watch for [artifacts related to not having goggles horizontal to floor] when they are first put in the bore so that they can reposition their head as necessary before imaging begins. Note that the goggles always get dimmer when the subject in moved into the bore." I am wondering whether this suggestion applies to the hardware we currently have?
Fogging of the goggles is caused by condensation when goggles and forehead are different temperature and humid air is trapped inside. Lifting the goggles off and letting air circulate seems to fix the problem. Obviously this is more difficult to do during a scan so it's best to check for this problem at the beginning. Drying the face may help. Natalie and Susan should be able to advise on this as they have the most experience.
The goggles we are currently using on both scanners do not have a dimming problem going into the magnet. They are also not sensitive to orientation in the magnetic field. Both those problems occurred with an older model that we no longer have.
Goggles on 4T - occasionally foggy
Posted - Nov 30 2006 : 2:32:41 PM
