MRI - AVERAGES - BACK TO BASIC
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- Опубликовано: 29 сен 2024
- Another important parameter when it comes to sequence building is averages. I will briefly explain to you what it is, and show you directly at the scanner what kind of impact it has. Nonetheless, I will share my experience on how I use this parameter.
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Averages can be used to provide good quality images as using 2 can minimize motion either voluntary or involuntary ( breathing on T-spine). I can also use it to negate PAT artifacts/FID artifacts and flow artifacts.
Pure quality, lots of pearls in what should be basic in MRI, but not that basic after all, thanks!
tweaking parameters like FOV, Phase oversampling, averages, bandwith, base&phase reso etc. while checking SNR & timet to get optimal image....really defines the skill of an MRI radiographer
Very true and patient care
Dang, BAC...you just blew my on the "free breathing" w/ the averages. I'm a NEW Tech and I could never understand NEX/NSA or concatenations. Now I know that there is hope for me because of YOU!!!! LOL.. Thank you for taking the time to do this for us. You are AWESOME!!
Thanks for the Feedback. It’s great to hear that these videos are useful. Very much appreciated. ☺️
Could you do a follow up about the abdominal averaging part ? That's interesting never tried it b4. Ofc you can't use that technique for liver dynamics but for a pacient that doesn't respect the breath holds at least you can some T1 without motion artifacts.
Abdominal imaging without breath holds but with many averages deserves a separate video on it's own. Can you also do TSE T2 with this technique ?
Also one thing to add both 100% Phase oversampling and 2 averages double the kspace in essence but with 2 averages you also get less artifacts especially motion/pulsation. I mostly use phase OS for avoiding wrap-around artifact and averages in rest .
we have many pediatric cases so this vibe fb is very useful for us. but yes i forgot to mention. this wont work for dynamic of course.
yeah i should do another video of that in the future. :)
We typically also have StarVIBES for pediatric patients, but I find that for the COR plane, turning off breath holds, increasing the NEX to like 4-5, works better as the COR StarVIBES tends to have BLADE artifacts. Typical scan times for a 1.5T using Multiaveraging VIBES is like 2 minutes or slightly less
very helpful!
Very informative video.
Thank bro
Hi,how to reduce superior sagital pulsation artifacts from post contrast sagital pit Fosa small for sequence
Try two avg and pat2. Also saturations anterior posterior
@@Nguyen_MRI thanks Bac
@chirathsulalith6771 no problem.
Thanks!
Takk for video Bac. Nysgjerrig på å prøve multiple averages på abdominal T1 Vibe Dixon og ikke minst som et alternativ på hjerter der pasienten ikke er i nærheten av å holde pusten. Gode tips der
Funker veldig ofte men abdominal går ikke med dynamisk selvsagt.
many thanks for your wonderful channel! I'm no mri tech but a radiologist specialising in ct and currently struggling to set up a decent mri practice on magnetom aera 1,5t pretty much all by myself and your videos have been invaluable. still I wish you'd show more tabs on those sequences so it would be easier to just copy them when needed. otherwise I often can't seem to get the time acquisitions and snr as good as yours. is there any chance you might be willing to share some of your protocols in exar1 files?
Thanks for kindly words. Please check out my patreon. www.patreon.com/bacmri
I lov u man.
Thank you bac 💪💪💪
Thank you! What is the difference between Short term and Long term modes?
Short term - Gives a better signal-to-noise ratio while maintaining the best resolution. Long term - Gives a better signal-to-noise ratio with optimized suppression of motion artifacts.
Hej Bac! Har precis börjat attackera sekvenser med optimering, tom prostata kör vi nu testar på endast 1 avg mot 3 som vi hade tidigare. Men just artefakter, pulsationer i rygg eller extremiteter där är det två som gäller! (Sista lösning för SNR imo)
virkelig gode videoer
mange takk
Takk for kommenter. Og godt å høre at det hjelper. Ønsker deg lykke til med arbeidet 👍
👍🏻
Những video a làm hay quá!
Thank you ☺️
Thanks, Bac
What is the difference between phase direction A-P and P-A? I don't see an explanation of this in the Siemens documentation. Does it actually move motion artefact in the chosen direction? TYIA
Not much of a difference in most clinical scenarios, but with ecg gating sometimes the data acquisition can cause an artifact that looks like an R wave which leads to incorrect triggering. Swapping from ap to pa, LR to RL etc can fix this.
@@scottgloverjohnson good to know
For dwi is important also. Mostly performed in AP. but sometimes PA can give better images over area of interest. You get some you loose some. Try and compare the images next to each other. Do a brain and it is easy to spot.
@@Nguyen_MRI interesting. I'll have to experiment. Thanks for your reply!