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Author Topic: Which MRI magnet strength? 7T, 3T, 1.5T?  (Read 1241 times)

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Offline Valentin

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Which MRI magnet strength? 7T, 3T, 1.5T?
« on: January 17, 2018, 10:31:02 PM »
Kind of a theoretical question - which MRI magnet strength is "better", and which is "best", for imaging most of the issues that this board deals with (i.e., knee/leg issues)?

From what I've read, 7T is the strongest commercially-available magnet, but it seems like it might be overkill for musculoskeletal imaging - the higher possibility of "artifacts", and of course the increased cost, might not make it worth it.


Offline Brandon123

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Re: Which MRI magnet strength? 7T, 3T, 1.5T?
« Reply #1 on: January 18, 2018, 08:09:23 AM »
I know that many orthopedic hospitals use 1.5T, it is usually enough from what I have understood.
RK sharp pain while running, diagnosis chondromalacia patellae 6/09
RK arthroscopic chondroplasty 9/09
RK rehab, recovery, 90% normal, started running again -> back to square one 5/15
RK diagnosis patellofemoral arthritis + LK diagnosis chondromalacia patellae 8/15 -> conservative treatment

Offline Vickster

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Re: Which MRI magnet strength? 7T, 3T, 1.5T?
« Reply #2 on: January 18, 2018, 09:08:24 AM »
I've probably had 8-10 MRI scans done on a number of joints (including both knees) over the last 8 years, all using 1.5T MRI scanners, all have shown what they have needed to for diagnosis. All reviewed by various skilled radiologists and orthopaedic surgeons
Came off bike onto concrete 9/9/09
LK arthroscopy 8/2/10
2nd scope on 16/12/10
RK arthroscopy on 5/2/15
Lateral meniscus trim, excision of hoffa's fat pad, chondral stabilisation
LK scope 10.1.19 medial menisectomy, trochlea microfracture, general tidy up

Offline reflex_nl

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Re: Which MRI magnet strength? 7T, 3T, 1.5T?
« Reply #3 on: January 27, 2018, 03:57:11 PM »
agree 1.5T is the std. 3T is nice for cartilage injuries.
RK Patella Luxation in 2000
RK Scope grade 2 damage to patella
RK PT for 4 mths, recovered 90% after 4 years
LK Patella Luxation in Oct'16
LK Scope to remove loose bodies (grade 4) to patella Nov'16
LK Lateral Release + MPFL Reefing + MCIC in the UK Dec'17

Offline LisaWilliams38

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Re: Which MRI magnet strength? 7T, 3T, 1.5T?
« Reply #4 on: May 24, 2018, 11:12:38 PM »
After 10 knee surgeries and as one who makes a lot of scar tissue, my OS is specific where I go. I use the same Imaging Center (to compare scan to scan each time), it's always with contrast (meaning it's actually called an Arthrogram), and it is a 2T machine--I was told if we ever move from the area, always seek out a 2T or above machine. He said it's best for imaging my multiple articular cartilage defects. Each image has been fairly accurate (I've had 6 there now since 2013), but the last one did miss 3 meniscus tears. It saw my articular damage perfectly though, which is supposedly not an easy feat for MRIs.   ;)  Keep in mind also that I'm in the United States.
'98 R plica
'99 L resect discoid meniscus
'01 L  meniscus tear
'02 R  meniscus tear
'10, R meniscus tears, Bursectomy
'13, R 3 meniscus tears, Grd 3 Biocartilage fil
'15 R Oct-ACI harvest,
'15 R Dec-ACI implant
'16 R Mar-lysis of adhesions
'16 R Mar-MUA
'18 L 3 menis tears, Grade 4 Biocartilage fill

Offline PwordsB

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Re: Which MRI magnet strength? 7T, 3T, 1.5T?
« Reply #5 on: June 09, 2018, 09:05:51 AM »
I've had four scans over the last two years.
2 on 1.5T and 2 on 3T.

I'm always reading that 3T is clearer particularly for cartilage injuries, but the quality of the machine is an important factor that doesn't get enough of a mention.  For me, one of my 1.5T scans was FAR clearer (to my eye and the surgeon's) than all of the other ones.  One of the 3T scans looked a bit like they used a crayon.

So my experience is that they're like a digital camera - more megapixels always sounds better, but a 30 20 megapixel camera is never going to come close to a high end 300 10 megapixel camera.
Snowboard injury 21/01/16
Open cartilage graft (Chondrotissue) 29/06/16
Sub-total lateral meniscectomy, LTP cartilage removal 20/01/17
11mm Closing Medial DFO and LTP Microfracture 10/08/18