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Troubleshooting
As an example, consider the case of a cine field echo sequence run on an animal with a
heart rate of 600 beats per minute (R-R interval of 100msec). Setting the blanking time
to 90 msec will accommodate an arrhythmia rate of up to 10%. If the single slice
acquisition time is 10 msec, then 8 slices can be acquired each at a different phase in
the cardiac cycle. Note that if 9 slices are attempted, false gates will occur, as the
vibrations ring down after the end of the blanking time, and the images will not be
accurately gated.
PC-sam data files as diagnostic tools
Both SnapShot and Trend data files are extremely useful in troubleshooting. SnapShot
files give a 36 second recording of all measured data while Trend data files continuously
record system measurements once per second.
Trend data files are collected automatically in the background while PC-sam is running.
Each Trend file has an associated Events file. SnapShot data files are collected every
time the SnapShot key is pressed. The SnapShot key is in the lower left of PC-sam's
main display. When the SnapShot key is pressed, the previous 36 seconds of all
measured data are stored on the disk drive.
The factory default location for these files is c;/ProgramFiles/PC-sam/SAM-
data/yymmdd where the folder yymmdd is date encoded. If PC-sam is opened more
than once in a day a letter is appended to the folder name. Trend files have a ".trd"
extension. Event files have a ".evt" extension. SnapShot files have a "'snp" extension.
These data files are not large. They can easily be attached to e-mail. It can be very
useful to send these data files with a description of your problem to service@i4sa.com.
Revision C, August 2013
C-7
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