MRI Susceptibility Weighted Imaging (SWI) @ 3T
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- Опубликовано: 29 сен 2024
- Lately I’ve been looking into SWI at 3T, how can I make the images better? I found some parameter adjustments which improves the quality. I want to share my thoughts with you.
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Hey! Great video, as always. You're doing the siemens MRI community a great service :)
Thank you. I wish I could try out other vendors also. But unfortunately, only have my hands on siemens equipment.
definitely!! Can't get Siemens to tell you any of this!!
Are you going to try this out at your scanner? let me know.
Definitely going to try this!!! And thanks for these wonderful tips.
my GE 1.5 scanner's SWI is literally SHIT!
Thanks for the useful tips. Bac would you show me more optimization on how to demonstrate the swallow tail in 1.5T swi sequence?
Hello, it’s really useful tips, but i was trying to do SWI (coronal) for the brain and I tried many time but unfortunately it didn’t work. Do u have any idea or advice to do it ? Thanks in advance
Thanks for sharing ideas. I haven't tried that but will do it as soon as I can. 👍
Hi, Bac. Thanks! I was wondering if you had any insight as to why the reciever/transmit bandwidth can be used to improve susceptibility artifact?
receiver bandwidth is the one we can controll at the scanner. more info here: cds.ismrm.org/protected/20MProceedings/PDFfiles/S71.html
You should do one on elastography. Don't see anything on that
Your content is really important and timely. These are of immense importance in modern MRI. I hope you will give us more content like this. Stay well. @ChandanAdhikary #From Bangladesh
Thank you for kindly words. Very much appreciated 😊
Thanks Bac! Ill see if i can try this on 1.5T trying to optimize it to compensate for the time. I think it could be handy at least to see the swallow tail for Parkinson’s disease when 3T is not available
If I’m not wrong siemens use te30 ms on 1.5T. So try to increase to te40ms. I Will try myself next time I can 👍
Can I try it in 1.5 Tesla??
I haven’t tried yet. But probably yes but different te.
Thanks for all videos but I like to see more training and trix about Ax30 or 50
Thanks again
thanks for this quick comparison. It is simple and easy to remember. I am adding this to my MRI fb group (private group for techs that I know).
I'll definitely try ASAP.
very useful information 🔥🔥
sure I will try TE,FA inc
I am definitely going to try this on my scanner .
Excellent info as usual Bac.
Hi Bac, just to confirm, is oxyhaemoglobin always hypointense on SWI and hypointense on phase? I’ve come across literature where it seemed this could appear iso-to hyperintense on SWI as well, and now I’m really not sure about its appearance on phase… Would be grateful if you could clarify!
Good question. From my experience appearance of oxyhemoglobin on swi and phase can vary depending on factors like oxygenation state, imaging parameters. iso-to hyperintensity on SWI, have been reported in the literature as you seen.
@@Nguyen_MRI ahh thank you 😊 😄could you clarify on what you mean by its appearance on phase could vary based on oxygenation state? does this mean that the more ‘oxygenated’ it is, the more hypointense the signals on phase could be? (assuming hypointense = diamagnetic)
@@rachlruby mriquestions.com/phase-of-blood-v-ca.html
@@Nguyen_MRI 😊Haha I know that, it’s just that since oxyhaemoglobin is already oxygen bound, I was trying to understand what you meant by oxygenation state could still cause the appearance to vary on phase… or did you mean perhaps the oxygen saturation level of blood could affect the signal? And I guess earlier on what I really wanted to know is, since oxyhaemoglobin is diamagnetic, on phase it might appear hypointense (if left-handed scanner) or hyperintense (if right-handed scanner), but at least *definitely* couldn’t show up with any other type of appearance right? - was wondering if in your career you’ve come across anything other than these possibilities, like have you ever seen them appearing isointense on phase, or something else?
@@rachlruby from my experience I've seen example as pediatric. Sedated vs fully anaesthesia. Two different time points. Same scanner same parameters. Appears hypo on one time and hyper another time. During sedation no added O2 is given whole fully 02 is given. Thereby images are differently. I dont think I've seen iso intense on phase at least i haven't noticed. Only theory.
I will try this advice!
I tried this at 1.5T using a similar 50% increase in TE (going up to 60ms). Having such a high TE caused a more T2 appearance with some CSF starting to appear. I think it may be best utilised at 3T.
Thanks for the feedback. I will take a look into this also. Keep you updated
Thank you so much bac
Thank you!
nine one
Super!
Hell yes, ofc I'll try it asap.
Can you also do one with dark_fluid please ?
I've heard from many that they don't like the "contrast" from Siemens , especially the ones coming from GE or other vendors.
I don't know what FLAIR contrast they want/like so...
Also when you mentioned that SWI is licensed , you should mention that instead of SWI if they dont have it they could and should use the "hemo" sequence instead.
True, hemo can also be used but can’t compared it head to head to the superior of the swi. But again I’m agreed with you. Not all have this option.
I’m very curious of what they dislike about this flair you mention. I mean in terms of what/how they like it. Would be awesome to work more on this flair.
@@Nguyen_MRI i have no idea what they don't like about it because they can't articulate it in words.
@@mihaimoldo it’s sad they can’t be more specific. Difficult to optimise then.
I thought this was interesting so I looked on our PACS. We have 50+ magnets sending to our PACS and many different vendors and models. I looked at a bunch of different 3T 2D FLAIR sequences and subjectively I don't see a "look" to the GE scanners. There were many variations of TR, TE, TI and turbo factor from all the scanners. You can try changing TE between about 80-120 with lower TEs giving better grey-white differentiation and longer TEs maybe making lesions more obvious. If you change TR you have to change TI to ensure CSF suppression so probably leave TR and TI alone unless you know how they are dependant on each other in FLAIR. You could also try running a 3D FLAIR but they tend to take at least twice as long.
@@raspberrypi3892 thanks for your time.
I know the GE flair "look"is subjective .
Usually most ask for 2D flair s in two planes which is longer than a 3D flair but you also get the risk of motion so repeating a 3D isn't preferable, but hey...3D FLAIR .
Thanks for taking the time to look at different flair and for responding .
Thank you for your videos. I have a technical question, we have a lot of instability using a GRE and DTI sequence which seems to cause motion type artifacts, possibly from vibrations. It's intermittent but seems to mostly affect GRE/EPI and not T2 and Spin echo sequences. Is there a setting I can tune to more this more stable of a collection?
great tips on this video. Will try it on both magnets. That true, as my teacher said "there's no free lunch in MRI" as we get good things in images (the small vessels) but more susceptibility will appears. BTW, a very good video. Thank you...
Thanks. Let me know the results. Never free lunch 😂👍
Does it work on a 1.5T ???
I haven’t tried yet. But probably yes but different te.
Is there any 3D swi sequence in seimens Skyra for PD patients
This swi is 3D. Pd patients?
I think this technique of increasing the TE might improve detail in the substantia nigra and dentate nucleus. It might also help to go to thinner slices to help with investigating Parkinson's Disease. You'd want to let the radiologist's know about the changes because the long TE sequence might be misleading when you need to compare against previous SWI images.
@@raspberrypi3892 very correct. That’s why it is also important to have your team around you such as radiologists and physicians.
Do you know Hindi
No.
👍🏻
Did you try on your 1.5t?
@@iggyantioch i tried
Did you notice any good changes
@@iggyantioch just a little bit