>> Buy & Sell Now

Contact Us

 Your Guide to Medical Imaging Equipment

Enjoy these tips, tricks and insights that answer 100's of questions we've received from radiology and imaging professionals that need help buying, selling, servicing and maintaining their medical imaging equipment: MRI, CT, C-Arm, Digital X-ray, PET/CT and Women's Health. We extend the life of imaging equipment so that healthcare providers worldwide can extend the lives of patients. This is why we answer your imaging equipment questions.

~ Block Imaging Team

ONI Extremity MRI Comparison: OrthOne 1.0T vs. MSK Extreme 1.0T

Posted by Randy Bolenbaugh

Mar 27, 2014 11:38:00 AM

:: 1 minute read ::


If you’re one of the many imaging facilities considering an extremity MRI, chances are that you’ve heard of the OrthOne and MSK Extreme 1.0T, both manufactured by ONI Medical Systems (purchased by GE in 2009). As you consider both of these models, you might be asking “what is the difference?” Believe me, given that the systems look pretty much identical… you are not alone. I’ve received this question on multiple occasions, so I figured it might be time to answer in a blog!

As you can see the article is not long. This is because the differences between these models are few and relatively minor. But, for clarity's sake, let’s check them out:

What's Different? ONI OrthOne vs. MSK Extreme 1.0T

Patient Chair

The MSK Extreme includes an easily moveable ottoman that accompanies the patient chair. The ottoman was available to the OrthOne, but it was an optional add-on and is an unusual find on the secondary market.

Helium Fills

Because these are extremity magnets, helium refills don’t break the bank and aren’t needed that often (capacity is ~65 liters). However, the MSK does have a slightly more efficient magnet and ONI asserts that a refill is normally not required. In the case of the OrthOne, partial cryogen refills need to happen, at most, once a year.


Both the OrthOne and MSK Extreme offer a 180mm coil and a 123mm coil. Optional to the MSK was a 160mm specialty coil. It isn't uncommon to find an OrthOne with a specialty coil since the coil design was compatible with it.


The MSK offers a more powerful computer system which includes an upgraded Pentium IV processor, increased hard drive storage capacity, DVD-R/W capability, and a larger 19-inch LCD panel (vs. 18-inch in the OrthOne).

Gradient System and Image Clarity

Despite the differences listed above, image clarity and gradient systems (15/60) remain the same with both models featuring great diagnostic images from the 1.0T superconductive magnet. There is a variant of the MSK with a 1.5T magnet, but these were produced under a limited run and are rare.


Hopefully this clears up the confusion, but, if you have any other questions, please contact us and we’ll be more than happy to help. Happy imaging! 

MRI Buyer's Guide

Written by Randy Bolenbaugh

author of blog post

Topics: Buying Imaging Equipment, MRI

Post a Comment Here

Search this site

Get medical imaging equipment insights delivered straight to your inbox. Subscribe below.

Resources, videos, and tools to learn more about your project
Meet the Block Imaging Team
See Imaging Equipment Prices

Questions? Ideas? Imaging project you'd like to discuss? Let us know!