POSITIONING MODE (FIX/REF/ISO). EXPLAINED WITH EXAMPLES

[@georgeta-sandamihaialexa8010]

You are my ultimate idol! I had a lot to learn from you, keep in touch, Take care and stay safe!

[@Nguyen_MRI]

thanks for kindly words. stay safe and have a nice weekend there.

[@ZaynebMejri-z7z]

thanks really from the bottom of my heart

[@jobinveloor5792]

Thankyou, I just joined a new place having simens I was trying to figure this out

[@-Hassanbderaldeen22]

Thanks very good

[@CurlyAiy]

Thank you! Very informative.

[@badrlinux6786]

good tips like always, Great Man and mind keep up 👍👌

[@johnthomas4713]

Thank you again, awesome. Anterior body array on obese patients helps tons for LSP

[@patrickcruz2334]

Since we used Body Coil and Spine coil for lumbar MRI at the same time. I presumed it gives more signal. Could we used PAT techniques to reduce time? Does it make a lot difference with the SNR?

[@Nguyen_MRI]

Yes please try it out 👍

[@hv6360]

Thank you very much, Bac!

[@natalyatyndall7240]

Thank you very much!!! Please, give us more videos of MRI exams. 🙏🙏🙏

[@hongngoc4945]

Thank you for all !!

[@ajabalserhani1769]

It’s so informative Thanks bro and keep going 👏

[@mudassirma8097]

Thank you 💓

[@robiulislamrobi5736]

I LOVE IT @ THANKS.

[@alwinswiss]

Thank you

[@nitishchavan25292]

will you please demonstrate this on elbow scan with supine position and hand near body....

[@alhashibs.kayting2131]

hi sir can you do video MRI for humerus, how it works...thanks

[@valentinagirotto3851]

Hi Bac! In my work experience, in lumbar studies I only use posterior spine coils. To avoid the loss of signal, I select prescan normalize with broad range mode on. I've noticed the difference between this choice rather than normale mode selected. I'm curious to know what you think about that. Let me know 🤗

[@Nguyen_MRI]

That’s correct. Many people use this approach of yours.

[@lucab4074]

Hi, Bac. Thanks for sharing. You told that in axial plane for the Lspine, we can use AP or RL phase enc, with or without presat, depending on the activation of anterior coil channel. Is it possible to apply parallel imaging with both of phase encoding combinations or only for one of these?

[@Nguyen_MRI]

Good question Luca. All these axial tests were done with grappa pat 2.

[@marlontimoteo6043]

Hi Bac thanks for the video . Regarding the used of body front for obese patient, will it increase the SAR?

[@Nguyen_MRI]

Good question. I haven’t notice any differences regarding sar.

[@marlontimoteo6043]

Great,. Thanks. I will definitely try this one. 🙂

[@Nguyen_MRI]

Yes let me know ☺️

[@selkalir6133]

Thank u for the informative video! Very useful! Quick question, doesn’t the extra body coil augment SAR as well? And if so how do we deal with it?

[@Nguyen_MRI]

Good question which need to be consider. In my experience I haven’t notice any sar issue regarding this on 1.5T or 3T.

[@selkalir6133]

@@Nguyen_MRI will try it asap! 👍

[@Nguyen_MRI]

Give it a try

[@MrCLarranaga]

Very informative thank you for your videos ! Question. When using both spine coil and body 18 coil in the AP phase direction do you ever worry about cross talk artifact? I’ve noticed If I have a coil set up for a pelvis and I’m using a spine coil for lumbar. If I don’t turn off the body 18 coil I will get artifact. Is this because the coil is outside of FOV?

[@Nguyen_MRI]

Thanks. Do you use multi stack in transversal plane? Or one big stack?

[@MrCLarranaga]

Bac Nguyen we use one big stack for transverse plane

[@Nguyen_MRI]

Ok interesting. This transversal t2 you remember what rf pulse you have on it? Fast normal or low?

[@MrCLarranaga]

Bac Nguyen if I remember correctly it is set to fast

[@Nguyen_MRI]

Try to put it to normal rf pulse.

[@hopsie9983]

Thanks for the video. This position thing has caused many problems, planned the scan and the image came out in a totally different position. So all brain sequences should be planned under fixed position, body/spinal iso, how about ref which body part is it most useful?

[@Nguyen_MRI]

thanks for watching. well honestly you can use the fix or ref for local areas such as knee imaging.

[@Ravikumar-lw3eu]

A very informative video Thanks .Could u please tell me how I understand the accuracy of phase encoding direction?

[@Nguyen_MRI]

mriquestions.com/choosing-pefe-direction.html

[@freddymendietagomez8253]

Nice video, i used fix and iso when a have to do mri of brain and spine at the same patient, but what will happen if we use iso to brain or knee?.

[@Nguyen_MRI]

No thing would happend beside small movement of the table and re shimming. In other words you loose overall examination time.

[@atleyishere]

Good video as usual. For the portion about using anterior coils for lumbar spine. I’m interested to know what filter settings you used, Pre-Scan Normalize, Normalize, or no filter? If you do not use an anterior coil and have one of the filters on the images can look very similar to the ones you shared that have lower signal intensity.

[@Nguyen_MRI]

Thanks. Always use the prescan normalise

[@atleyishere]

Bac Nguyen with no anterior coil wouldn’t you want to turn that off?

[@Nguyen_MRI]

Good question. Actually no from my experience. Because the image intensity will various from light / dark throughout the image while scrolling through your sequence.

[@bala-bf5zn]

Bro your update are so useful to us can you upload about 3T siemens Vida cardiac tricks for reducing scan time and post processing it will really helpful us

[@jademiller3728]

Hi, thank you for the videos! Do you know why my sequence would appear in all 3 graphic windows if I drag the picture icon up to one graphic window? I’m on Espree B19 software.

[@Nguyen_MRI]

Hi. Please check the tab RESOLUTION - FILTER and then check the parameter DISTORTION CORRECTION. in your specific protocol you need to either have everything off or on in your sequences. Including your localiser. Or else this can causing such a problem as you mention here. Please try out and give feedback. Thanks.

[@jademiller3728]

Bac Nguyen thanks, I will try it today and let you know! 😊

[@jademiller3728]

Bac Nguyen yes in deed, that’s what the problem was thank you Bac!

[@abrabr6720]

@@Nguyen_MRI that’s could be a good video for a quick tip.

[@abrabr6720]

Sometimes I experience the same problem, thank for bring it up❤

[@bevgibson7791]

Great videos. I am not fully understanding point made about the blue line. We don’t actively use this feature and I don’t know it. Please can you explain thanks. We have an old avanto

[@Nguyen_MRI]

The blue line is just the indicator of your iso Center within that FOV. Try to test out the function iso / fix and ref. Having in ISO you see the blue line moves within your FOV and the table inside the scanner moves along your wanted position. But having the ref or fix it doesn’t move. This iso came along with tim4G - total imaging matrix for the first version of AvantO software. Makes your positioning much easier and won’t think of scanning outside the FOV. Another test you can do is to have it on either ref or fix. Then move your FOV way up or down and then you see the yellow box turn to orange. Means you scanning way out of isocenter.

[@abrabr6720]

Very helpful

[@anniesshenanigans3815]

I believe you can turn that line on.

[@anniesshenanigans3815]

another question. When doing total spines. When you get that error that the scan won't run (because you are scanning different areas of the spine) how do you fix this? I ran into this last week with a pt that I was doing a Brain/pelvis w/wo. Didn't want to reloc because I wanted my settings saved. The scanner absolutely did not want to run a Coronal T2 on the pelvis. It's been so long since I had this issue I forgot how to resolve it.

[@Nguyen_MRI]

If I understand you correctly put all brain sequences on fix mode. Then all spine on iso mode.

[@patrickcruz2334]

Can I use Body 6 also instead of Body 18 (the smaller body coil)?

[@Nguyen_MRI]

Yes should work 👍

[@NoVoiOvi]

In what case REF is useful as a positioning mode? And thanks for the informative video!

[@Nguyen_MRI]

Thanks for comment. From my experience I only use iso and fix. I know other use ref as well. But on the newest software xa platform you only have two options. ISO and one more.

[@NoVoiOvi]

@@Nguyen_MRI Same here, we only use fixed and iso, thats why i asked if there was an advantage in some protocols, thanks for the reply!

[@sdtcwarren]

I noticed that when you're scrolling through your image in 1 plane, there is a coordinating reference line in your other planes. Is this a feature that can be turned on? I'm on a 1.5T Siemens Magnetom Aera.

[@Nguyen_MRI]

Sure. At the top you see VIEW - reference lines on.

[@sdtcwarren]

@Nguyen_MRI you are awesome! Thank you so much for sharing!

[@mirelamihaila1884]

Hi. Sorry but i didn't understand where did you put the body coil? On the pacient or under the pacient?

[@Nguyen_MRI]

@@mirelamihaila1884 spine coil on the back. Body on front

[@mehmet6534]

Hi, do you have a youtube channel that you know and also tells about the GE machine like you?

[@Nguyen_MRI]

Good question. Unfortunately, not.

[@natalyatyndall7240]

Do you have a video for hand MRI?

[@Nguyen_MRI]

No unfortunately not. Anything specific in your mind?

[@dt6725]

Thank you Bac, Do you have the youtube or sites of your friend ?Espenados? so that we can follow him for more tips. Thank you.

[@Nguyen_MRI]

Unfortunately not.

[@tamerass]

I've been taught to use REF mode when doing perfusion and/or spectroscopy (brain). Is it okay to use FIX mode instead? Will there be any difference?

[@Nguyen_MRI]

Good question. I’m using fix for all head examinations. No problem with perfusion or spectroscopy from my experience.

[@tamerass]

Thanks for the clarification. 👊

[@Help.for.Radiology.Tech8367]

Sir kindly make video on how screen recorde of MRI (semins) software

[@shadowboxer6462]

Do you need the head coil when using body coil?

[@Nguyen_MRI]

No need. Depends on what you want to take image of.

[@u.venkatesh2321]

Pls provide cardiac morphology and Viability videos 📹 brother

[@Nguyen_MRI]

kzbin.info/www/bejne/r5PQi4V-f69kbaM

[@SC-gh6gd]

So having it fixed will save you time from reshiming?

[@Nguyen_MRI]

Good question, yes and also need to be used carefully for smaller area such as head imaging.

[@SC-gh6gd]

@@Nguyen_MRI thanks. I need to master this concept. You know where I can get more information on this specific concept? Thanks!

[@Nguyen_MRI]

I haven’t found a better explanation other than the manual. Besides testing myself and tried to explain further in this video.

[@SC-gh6gd]

@@Nguyen_MRI yeah I seen the manual but like to know more haha. Thanks for your video. Stay safe!

[@anniesshenanigans3815]

this is the second time I have watched this and I still do not understand the difference between Ref and Fix mode. I see the reason for Iso, but the other two look pretty much the same... what am I missing???

[@Nguyen_MRI]

Can be very confusing. Ref fix are changed on the newest software. I use fix for exams where I only need to be at one place and specific. Such as knee, brain, cardiac etc. Instead of iso where the table moves to isocenter. I find fix safer to use compared to ref, because having a combination exams of let’s say brain(fix) and spine (iso). You see by using fix and plan from there you know what you get whenever you apply the sequence. If using ref you can miss postions depends on what sequence you plan from. Just try it out on your scanner and you will see.

[@u.venkatesh2321]

Wer r u frm brother

[@Nguyen_MRI]

Norway

[@viang1520]

Anh có phải người Việt ko ạ

[@Nguyen_MRI]

Yes

[@viang1520]

@@Nguyen_MRI Hihi em rất thích các video của anh, tiếc quá em chỉ xem hình ảnh thoii chứ tiếng thì không hiểu hết được. Anh có thể cho em tham khảo ít tài liệu về MRI của anh được ko ạ, 😄

[@Nguyen_MRI]

Anh kh biet nhieu tieng viet

[@viang1520]

@@Nguyen_MRI anh có Facebook hong ạ. Em xin để flow học hỏi thêm hihi

[@Ahaha4]

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