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 Unwanted Head Rotation in 4T Spiral-In Images		  New Topic  Reply to Topic
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allen.song
BIAC Faculty

USA
35 Posts
Posted - Jan 03 2005 :  5:12:08 PM  Show Profile  Reply with Quote
Some users (Jamie, for one, thanks!) informed Todd and I that the spiral-in images had some unwanted rotations up to five degrees to the right. I did some investigation today and they sure were there. It seems that the 4T receiver hardware has drifted over time to cause this. An immediate fix is in place by adding a -12 us (-12 micro second, determined from a grid phantom scan) offset during the signal readout, and I have asked the techs to do it from now on. I will incorporate the final changes into the pulse program permanently after a few days of trial period.
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