Science Questions

What is the smallest thing you can see in an MRI?

Sun, 11th Feb 2007

Part of the show Nuclear Power

Question

Maggie in St. Andrews asked:

What's the smallest thing you can detect in the body with an MRI or a CT scan? Is it 10 millimetres or smaller? What's the smallest tumour you can pick up?

Answer

The resolution of MR is in millimetres. Obviously if you wanted to go further with CT, you could, but it would require a greater radiation dose.

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