Anyone considering the purchase of an MRI machine should know that a healthy cooling system is essential to the maintenance and performance of their magnet. This means, among other things, keeping an eye on your helium level and getting refills at the proper time. Unfortunately, because there are so many different types of magnets in use today, and each of them experiences helium loss (AKA, boil-off) at a different rate, there is no one-size-fits-all prescription for when this needs to happen.
To help those of you comparing magnets and those of you looking to keep your existing magnet healthy, we've compiled helium boil-off rates for the top six magnets on the secondary market. These are the magnet types we see most often as a provider of used/refurbished MRI machines. Also included are a few pointers on refill rates and recommendations.