seanachai 18/12/17
Last reply 6 months ago
MRI technicals

Hi All

Does anyone have a good authoritative source of information on MRI scan technicals… specifically Tesla strength and applicability to MS, also T1/T2 weighted non-weighted etc.

One of the reasons for asking is that I have been on the MRI slab recently again, given I am claustrophobic (wuss I know), I had to option to take an upright on the insurance (apparently really expensive); so I took the easy route and avoided the drugs to get me inside the sardine can….

The MRI on this occasion was with contrast but oddly enough no pre-contrast scan, which I asked Neuro about, but he said not required on this occasion… long story short the radio guy found no active lesions etc. this is post a recent flare up….. and that he could not comment on lesion progression as he had no pre-contrast scan….

I then find out through another source that if the scan with contrast is done on the “right” MRI machine i.e. Tesla strength, the Neuro should be able to tell everything, active vs historical…. I dug further into this and it seems there is some truth in this based on the Tesla strength of the MRI… On one site I found a post that said for MS, it really should only be done on 3T MRI these days where possible as opposed to the common 1.5T, machines lower than 1.5T may might miss small lesions, other factors affect his also, slice size etc (not fully got my head around this yet)…. it has now transpired the machine I got my upright MRI on (and apparently this applies to most open/upright MRIs) only supports 0.6T…. thats a long way off 3T…..

I am now concerned that I have probably missed lots of details on my MRI and will most likely have to jump in the 3T sardine cans ….and do it all over again, pain in the ass as its a full CNS scan and with pre and post gad can take hours….

Are there any experts in this area who can address some of the points or does anyone know of any authoritative sources on the technicals of MRIs….

It seems an important point for the general community, as I now feel a lot of people are in the same boat getting on to sub-standard MRI machines where MS diag. is concerned…. it would be useful patient info to be armed with so you can ask of the machines capabilities….

cue tumbleweeds, its probably too technical 🙂

Thanks.

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stumbler
7 months ago

@seanachai , see if this website goes into the detail you require :-

http://www.sprawls.org/mripmt/


Anonymous
7 months ago

Hi Sean! I spoke to my old pal who is a radiologist after I read through your message. Once upon a time they used to do contrast and non contrast to identify active and non active lesions. This changed when the mri contrast could show up both active and inactive lesions, removing the need for both. He thinks 0.6 Tesla is too low. 1.5 would be standard. 3.0 is more for musculoskeletal mri scans. 0.6 is for open magnets and you do get poor images so best to get the enclosed one if you can bear it. Good luck


Anonymous
7 months ago

Amendment: they didn’t used to use contrast all which is why they needed repeated scans. Now contrast highlights both active and inactive lesions in one fell swoop. Sounds like 1.5 should be enough though. Contrast, enclosed mri at 1.5. And plenty of diazepam 😉


seanachai
7 months ago

Thanks @stumbler, I will take a read.

Thank you @cleopatra also, maybe I will take some gin & tonic + diazepam; it can’t be that hard to overcome …


seanachai
6 months ago

@stumbler, many thanks for the link(s).. wow massive detail… i may need an exam after finishing that reading, not being sarky… its great reading…

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