Error running .seq on Siemens 3T PRISMA

[RikRolling]

Hi,

I've been having issues trying to run my sequences on a Siemens 3T PRISMA system . I've had an error in the MrMeas log saying 'ERROR: The sequence run method returned with 0x36494CB1EE14003F'

I'm using Pypulseq version 1.5.0.post1 for these sequences.

Has anyone else experienced this error and what could be causing it?

I was able to successfully run a different sequence (single shot EPI) which used pypulseq 1.4.2.post1

[JosephGWoods]

Hi Rik! Whichversion of the pulseq interpreter sequence are you using? One thing to check is what the version number is in the .seq file. When you use 1.5.0.post1, does it say 1.5.0 or still 1.4.2?

Once you download the newer version of pypulseq, you need to reinstall it if you used 'pip install -e pypulseq', otherwise 1.5.0 features might be used, but the version number in the .seq file will still say 1.4.2, which will cause an error when reading in the .seq file by the interpreter sequence.

[RikRolling]

Hi Joe! Thanks for your response! The version number comes up as 1.5.0 in the seq file. I made some sequences with version 1.4.2 just to check if there was a version mismatch between the scanner and my sequences and that seems to be the case! Is there a way to upgrade the pulseq interpreter on the scanner?

[JosephGWoods]

You can get the latest version of the pulseq interpreter sequence (1.5.2.post1) for Siemens scanners from the Teamplay platform. You may need to ask someone at your institute who has access to download it for you.

[RikRolling]

thanks so much!

[JosephGWoods]

Hi Rik, also something that you can do in the meantime is to use the seq.write_v141() function to write the seq file using the 1.4.1 standard. This should make the seq file compatable with your current pulseq interpreter sequence, but will disable any later implemented features.

Still try to get the latest pulseq interpreter sequence though as it is also just much more stable.