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= 4.7 T scanner= = 4.7 T scanner =
In November 2016, we started to investigate using the 4.7 T scanner for hemi or whole brain scans. Lee met with Chris Farrar to try to set this up, but there were many issues (mostly since we have to use the largest gradient set, which nobody else uses. After discussing with Bruce, we put using this scanner on hold until we get support from the center. Here are some notes from this setup:

 * There is currently no receive array, there is only a birdcage. We would need
to build our own if we want to acquire multiple channel data.

 * The amount of power used for the coil was hard set to a number below what we
need, so the transmitter voltage (or some Bruker equivalent) did not converge.
Chris said that he could contact Bruker so that this could be changed since he
thought it was set at a conservative level. We had to set it to a lower,
non-ideal value to scan anything.

 * Chris recommended using only ~64 slices (128x128 matrix size) when running a
1mm FLASH scan. This isn't enough to cover a whole hemi. I'm not sure exactly
whether he thought a larger FOV would put too much strain on the system, or
that he saying to use that for testing. We intially tried using 128 slices and
it wouldn't run. I can follow up more with him and/or Joe about that.

 * I couldn't import Giorgia's/AY's diffusion protocols to edit. We use a
different gradient coil, and it wouldn't load in the program. I could follow
up with them to get a print out or some other usable form so I can see what
they run.

 * The Bruker software (ParaVision) is more Siemens-y, but it is still very
different. It was difficult to set up a flash scan, and I wasn't sure what to
for a diffusion protocol at all without an example. It would probably take some
help to get hemi/whole brain scans set up, or at least some time reading the
manuals and getting familiar with it.

 * The viewing software is hard to use, even to quickly check if the sample fits
inside the FOV. ParaVision also crashed and closed out completely twice while I
was trying to view an image.

 * You need to wear earplugs in the room while a scan is running, since the back
of the scanner doesn't close completely (or it's just very loud). This makes
it hard to try to debug/work on a protocol with someone while a scan is going
on.

 * We are one of (or the only) group that uses a large birdcage without any
gradient inserts, so we would have to have Chris take out/put in the gradients
when we start/finish. Eventually, we could do this ourselves but he said only
experienced users are allowed to do that.

15 T scanner

4.7 T scanner

In November 2016, we started to investigate using the 4.7 T scanner for hemi or whole brain scans. Lee met with Chris Farrar to try to set this up, but there were many issues (mostly since we have to use the largest gradient set, which nobody else uses. After discussing with Bruce, we put using this scanner on hold until we get support from the center. Here are some notes from this setup:

  • There is currently no receive array, there is only a birdcage. We would need

to build our own if we want to acquire multiple channel data.

  • The amount of power used for the coil was hard set to a number below what we

need, so the transmitter voltage (or some Bruker equivalent) did not converge. Chris said that he could contact Bruker so that this could be changed since he thought it was set at a conservative level. We had to set it to a lower, non-ideal value to scan anything.

  • Chris recommended using only ~64 slices (128x128 matrix size) when running a

1mm FLASH scan. This isn't enough to cover a whole hemi. I'm not sure exactly whether he thought a larger FOV would put too much strain on the system, or that he saying to use that for testing. We intially tried using 128 slices and it wouldn't run. I can follow up more with him and/or Joe about that.

  • I couldn't import Giorgia's/AY's diffusion protocols to edit. We use a

different gradient coil, and it wouldn't load in the program. I could follow up with them to get a print out or some other usable form so I can see what they run.

  • The Bruker software (ParaVision) is more Siemens-y, but it is still very

different. It was difficult to set up a flash scan, and I wasn't sure what to for a diffusion protocol at all without an example. It would probably take some help to get hemi/whole brain scans set up, or at least some time reading the manuals and getting familiar with it.

  • The viewing software is hard to use, even to quickly check if the sample fits

inside the FOV. ParaVision also crashed and closed out completely twice while I was trying to view an image.

  • You need to wear earplugs in the room while a scan is running, since the back

of the scanner doesn't close completely (or it's just very loud). This makes it hard to try to debug/work on a protocol with someone while a scan is going on.

  • We are one of (or the only) group that uses a large birdcage without any

gradient inserts, so we would have to have Chris take out/put in the gradients when we start/finish. Eventually, we could do this ourselves but he said only experienced users are allowed to do that.

SmallBore (last edited 2021-09-22 09:13:20 by DevaniCordero)