grid-258 on skyra

[Hannah Lindsey]

Hey, Frank!

Thanks so much for sharing the exar and other details for your recommended 258-direction grid sampling scheme! We'd like to use the sequence for an upcoming study, but the scanner is a Skyra. Do you by chance have the exar for a Skyra that you could share with me?

Thanks so much!

Hannah

[Frank Yeh]

I am sorry I don't have it.

I can help checking the results or parameters you acquired to see if they are good.

Best 

Frank

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[Andre Gouws]

I'll just chip in here for the record as Iam working over many scanners at the moment - I have had a lot of luck importing across Prismas, Skyras and even Vidas - some tweaking is required (so getting Frank to double check is handy) but you may be surprised at how little you need to change. Unfortunately I don't have Frank's  258 grid file to share but I work with many similar sets of grids.

Beware the max b-value with the different gradient coil strengths though - you may get very little signal on a Skyra at b=4000, 3000 and even 2500.

Andre'

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[Hannah Lindsey]

Awesome! Thanks to both of you for your help!

_________________________________

Hannah M. Lindsey, PhD

Research Associate

TBI and Concussion Center

Department of Neurology

University of Utah

On Aug 8, 2024, at 10:58 AM, Andre Gouws <gou...@gmail.com> wrote:



[Frank Yeh]

Thanks Andre for chipping in!

Wish I had more experience in other scanners.

Best

Frank

[Hannah Lindsey]

Frank,

We set up the grid-258 sequence on our skyra, and we've collected some data using that protocol. If you're still willing/able to check the parameters to make sure it looks okay, that would be greatly appreciated. I have six scans (but you'd only need to check as many as you see fit) that I can share with you, but I currently have limited internet access, and it would take a very long time for me to upload it to your Dropbox folder. Can I share a link to the data with you via email or some other way that isn't public?

Thanks so much! 
Hannah

[Frank Yeh]

Sure. Feel free to share as you see fit.

Frank

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[Hannah Lindsey]

Wonderful. I just sent it to your fran...@gmail.com address.

Thanks again!!

[Hannah Lindsey]

Hello! The VA we perform scans at for some our studies is upgrading their scanner from a Siemens Skyra to a Vida. Would it be best to convert our grid-258 protocol on our own, or do you have an existing .exar file for the Vida that would work better?

Thanks!

[Frank Yeh]

Hi Hannah,

I don’t have a ready-made .exar file for the Vida, but I’ve helped
other groups transition from Skyra to Vida, and it’s usually not a big
challenge.

In most cases, converting the grid-258 protocol directly on your end
works well. The main parameters (b-values, directions, resolution,
timing) can be matched fairly closely, and only minor adjustments are
typically needed depending on gradient performance and sequence
version.

Best,
Frank

[Hannah Lindsey]

Okay, thanks! The transition will happen over the Summer. Can I send you some data we collect from it after it's set up for a QC?

__________________________________________

Hannah M. Lindsey, PhD

Research Associate

TBI and Concussion Center

Department of Neurology

University of Utah

Tel: (919) 368-3055

[Frank Yeh]

Yes, I'd be happy to!