Shimming in MRI: Why Getting it Right Matters (and How to Do It)

Ever wonder how MRI machines create those incredibly detailed images of our insides? It's not just about powerful magnets; it's also about achieving a perfectly uniform magnetic field. And that's where shimming comes in.

Think of shimming as fine-tuning a musical instrument. Just like a piano needs tuning to produce harmonious sounds, an MRI scanner needs shimming to produce clear, distortion-free images.

Two Types of Shimming: Active vs. Passive

There are two main approaches to shimming:

  • Active Shimming: This method uses electromagnetic coils to dynamically adjust the magnetic field. It's like having tiny, adjustable magnets within the MRI system itself. Active shimming was common in older GE models and is still found in some newer ones.
    • The good: Easy to adjust, especially with modern tools like our MPS2.0.
    • The not-so-good:  Requires periodic adjustments due to magnetic field drift, which can lead to increased service calls and helium consumption.
  • Passive Shimming: This technique involves strategically placing thin metal plates within the MRI scanner during installation. These plates are manually adjusted to fine-tune the magnetic field.
    • The good: Offers long-term stability and rarely needs readjustment.
    • The not-so-good: Requires a specialized and expensive tool called a Shim Camera, and the initial adjustment process can be time-consuming.

So, which type of shimming is right for you?

The answer depends on your specific needs and priorities. If you value ease of adjustment and have a service contract that covers helium refills, active shimming might be a good option. But if you prioritize long-term stability and want to minimize future interventions, passive shimming could be the way to go.

Digit Systems: Your Shimming Experts

No matter which type of shimming your MRI system uses, Digit Systems has the tools and expertise to help you get the most out of it. Our MPS2.0 offers integrated active shim control, making adjustments a breeze. We also provide support for passive shimming procedures, ensuring optimal image quality and system performance.

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