KNEEtalk

The WAITING ROOM => GENERAL KNEE QUESTIONS and comments (good for new threads) => Topic started by: Valentin on January 17, 2018, 10:31:02 PM

Title: Which MRI magnet strength? 7T, 3T, 1.5T?
Post by: Valentin 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.

Thoughts?
Title: Re: Which MRI magnet strength? 7T, 3T, 1.5T?
Post by: Brandon123 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.
Title: Re: Which MRI magnet strength? 7T, 3T, 1.5T?
Post by: Vickster 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
Title: Re: Which MRI magnet strength? 7T, 3T, 1.5T?
Post by: reflex_nl on January 27, 2018, 03:57:11 PM
agree 1.5T is the std. 3T is nice for cartilage injuries.
Title: Re: Which MRI magnet strength? 7T, 3T, 1.5T?
Post by: LisaWilliams38 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.
Title: Re: Which MRI magnet strength? 7T, 3T, 1.5T?
Post by: PwordsB 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.