BACK TO BASIC - RESTORE PULSE
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- เผยแพร่เมื่อ 15 มิ.ย. 2020
- Restore pulse is a much needed parameter to obtain shorter TR on T2w and PDw sequences. However, how far can we push this in terms of having a low TR and still maintain the fluid signal…. Today, I’m going to take you to a scanning session where we going to scan multiple sequences from having a low TR compared to a higher TR, in the combination of having the RESTORE pulse on/off.
Join me, I got surprised by the results.
Thanks for watching and following, hope you find this video interesting and valuable.
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I’ve never used restore pulse before. I will test it out. Thank you!
I liked it already.. within 3 min
Well that’s surprising!
❤❤
I like restore in low TR scenarios where I want good fluid signal contrast for PD and T2 imaging. Notice the difference in FS homogeneity for the bone and fat.
You are gorgeous!
can you show some mri cervical brachial plexus and mri ribs
It would be interesting to see these effects in the spine for CSF on a T2. I know a few years ago there was a paper that showed how using the restore pulse with too low of a TR in T2s led to missed MS plaques. They were using a TR of about 1700 to keep scan time down, but used the restore pulse to keep CSF bright. But it's important to remember that while restore will drive fluid back into the longitudinal plane for the next 90 degree pulse, other structures and lesions need adequate longitudinal recovery time (long TR) to be seen on T2
hi ryan plz how rstore puls work to get higher signal for fluids
Well no wonder since they were using 1700 TR for a T2. The theory says for T2 contrast a minimum of 2000 is required and in practice you get a good contrast above 2500. The longer the TR the more signal you get from tissues but ofc the scan time gone up.
As always, I really appreciate your video making practical comparison. I like using this option too but sometimes it becomes a SAR issue due to extra pulse. Of course this happened more in 3T than 1.5T. Have you had the same issue too?
Yes true on that. Lower your flip angle to minimum 120. Wouldn’t note any difference in image quality and sar friendly. Also rf pulse low as one of last solution. Due to changes of inter echo spacing. However be much careful using saturation bands. Only if needed. 3T is a killer if using it correctly though.
Bac Nguyen True that! I use those adjustments to combat the SAR issue, but it will still SAR and that’s when I just give up on restore pulse..:) Until I saw the comparison you made today, I thought it didn’t make that much of difference on T2 signal. Now I know it does!
@@Nguyen_MRI Nice video! Be careful with combining RESTORE and LOW SAR (and Fast RF) on software E11C and older. Low SAR and Fast RF are VERSE-pulses, and this combo might give you reduced fluid signal in some of your images in the stack. Use Normal RF instead. This is solved in software E11E (numaris 4) and XA 20 (numaris x).
Hi .. I want thank you for what you do and ask you, is it work with STIR sequence ?
For stir I don’t use it due to ir sequence.
Bac Nguyen Thanks bro🙏
Hi Bac, is there a disadvantage to using the RESTORE pulse with SAR? Adding the extra pulse could cause SAR issues, no?
Can cause extra sar yes
Why do you work with 2 concatenations? If you use 1 concatenation you can reduce the scan time and you don't need to use the restore pulse... Is that true? Nevertheless, I use it in pd fs sequences as well!
Good question. Just due to crosstalk if having 0 or low gap. That’s why I use two concats. But look at the tr2000 rst vs tr 4000 without restore. Tr 2000 rst seems better in the measurements I did.
Concatenation has got nothing to do with T2 sequence. Do you agree with this statement?
Scan time would not necessarily decrease that much as TR will rise with one concetanation. It is a usefull tool in sequences with a low slice thickness and gap to decrease TR especially if you want to cover a bigger region for example the brain with more slices or in T1 sequences to decrease TR and when sequential acquisition leads to problems. In combination with restore pulse it can combine a lower TR with good liquid signal. But sometimes one concetantion less gives me a lot of opportunities ;)
Concats has nothing to do with t2. But crosstalk can occur on t2
Lukas von Erdmannsdorff Thanks for the kind response. But what you mean by “opportunities”?! And we could easily utilise concatenation parameters in T2 sequences to reduce the scan time where its role (concatenation) isn’t relevant.