MRI - GRASP VIBE - TROUBLESHOOTING

[@SO-bl2et]

Thanks for this video, we recently started using GRASP VIBE after the upgrade to Solafit. I ntoiced that artefact appears on & off without any manipulation so could be dependent on factors like (Pat habitus, position of arms, frequency etc may be). Anyways thanks for the tip, i will apply this and let you know about the result.

[@Nguyen_MRI]

Thanks keep me updated. Wish you the best with work 👍

[@mihaimoldo]

Good thinking outside the box Bac... literally. But to me it doesn't make any sense why the second sat band positioned outside on the air would reduce the streaking artifact. It should work best with both bands overlapping on the right arm not one saturating air, anyway. Maybe it's something in the background with the sequence that we aren't aware of, only the devs. For the streaking you could also increase the radial views in the resolution card, no? Ofc that will increase the sequence time overall. Great video as usual Bac! 👍

[@Nguyen_MRI]

Same thoughts as you. Was thinking about a solution for a long time. Can’t understand everything in the world mri. Most important. Keep learning. ☺️

[@nookenieminen5826]

Yes, like you said, more radial views (more spokes) will decrease streaking artefacts, but it takes time (lose temporal resolution) and those artefacts are usually outside the anatomy of diagnostic interest.

[@Nisa-w6i]

Hello Sir Bac, I'm one of the fans of your content on YT. I like studying MRI via your KZbin. very helpful, I am a radiology technician student from Indonesia. I'm in my final year and experiencing problems in choosing a thesis title for my final assignment. If you read my comment and like it, can you give me some good ideas for a thesis? this is very confusing

[@Nguyen_MRI]

Thank you. Firstly what is your interest in this field. One hot topic these days are artificial intelligence. Maybe something in that direction?

[@TAHA-TOUABA-RADIOGRAPHER]

Thank you so much pro

[@domrynk2]

Here's one I would like you to test, try off-centring the patient towards their left, bringing the liver closer to the centre of the bore, allowing you to move their right arm away from the body, and see if that reduces the artefact. What do you think?

[@Nguyen_MRI]

Could be a good idea. But do you think the right part of the body will be bad? Whenever doing these kind of exam our rad would like to see things outside the liver as well. Nonetheless, the approach I’m showing in this video seems to work? Don’t you think?

[@domrynk2]

@@Nguyen_MRIit could end up worse on the spleen side yes, but it would be nice to see if moving the arm out to the side would stop the artefact. On a slimmer patient you wouldn’t need to off centre them to be fair!

[@Nguyen_MRI]

Interesting though. I know artifact would be gone if having a larger fov or arms above.

[@BoomItsCharlie]

This isn’t related to this video, but you know so much more about scanners than I do, so I’m gonna ask.. there are too many contrast options to pick from on my Siemens scanner. Any idea how to delete some of them?

[@Nguyen_MRI]

Options? You mean in your protocol?

[@BoomItsCharlie]

I have a picture I could send you. Where would be easiest to send? I think it would be easier than explaining.

[@Nguyen_MRI]

@@[e-mail]

[@BoomItsCharlie]

@@Nguyen_MRIemail sent

[@MsWendy888]

Sir Bac. Good day. May i ask if how can i apply as a MRI radiographer in Norway? I am currently working here in Saudi Arabia as a MRI tech, and your videos helps me a lot in my career as a MRI tech. Thank you

[@Nguyen_MRI]

I’m pretty sure you can. But I guess there are certain rules here. I’m not familiar with those rules unfortunately.

[@frankiechankf1]

Do you think changing the FOV will also create some unexpected artefact inside the liver? I have tried one paediatric case, we only decrease the FOV and then some hypointense artefact was seen inside the liver.

[@Nguyen_MRI]

I think increasing the fov will help yes.

[@caldersheagren]

Can you get away with only one saturation region on the left arm and none on the right arm?

[@Nguyen_MRI]

good question. i think this sequence is stick with 2 sats. cant remove it. only placing it.

[@selimakko]

👍

[@djfhdjfjfh659]

At athor mri machine like get and Philips what's the name of gtaspa vibe thankd

[@Nguyen_MRI]

I don't think Philips have similar.

[@郭洺銍-y5n]

@@Nguyen_MRI i think in GE the similar sequence names DISCO STAR , but i am not really sure the principle is the same as GRASP VIBE , but both of them in free breathing to make a body 3D gre imaging

[@arnabpapiya145]

Thanks sir

[@Nguyen_MRI]

Have you seen this artifact before on GRASP VIBE?

[@nookenieminen5826]

Bac, have you tried to put sats straight in FH and AP- direction and so that they are outside the FOV, not inside the FOV? 1. That way FS would work in arms inside FOV> less artifacts from bright fat signals spiking. 2. Also sats would saturate signals that are outside the FOV and may foldover now (PO would be better but than sats, like in BLADE, but I don't know if you can do that in that Grasp-Vibe sequence, also timepenalty would come- so it would be same to increase FOV). The right side striking artefact in the image may also fold from left arm parts outside of FOV, not from right. Like you said in video, FS worked in your last third session in left arm and artefact deminished in rightside of body. Also some artefact might also come from outside FOV in FH direction too, so it would be better to use less coils in FH direction, theoretically, if possible, propably not. I don't know if Siemens already uses streak artifact reduction in CS Grasp where coils which picks up more artefact is demished or 'rescaled down'? Google for more info: 'US 2019/0346518 A1' What parameters are under the Geometry/Saturation and there 'special saturation'? Is there sats power adjustment?

[@Nguyen_MRI]

Thanks for comment and idea. No i havent tried that. Will give it a try 👍. No adjustments on sat possibilites.