What type of MRI unit uses bricks of magnets to produce a strong static field?

The type of MRI unit that uses bricks of magnets to produce a strong static field is the permanent magnet. Permanent magnets are constructed from materials that are magnetically hard and retain their magnetization without the need for an external power supply. In MRI systems, these permanent magnets are designed in the form of large, block-like structures that create a consistent and stable magnetic field essential for imaging.

This setup is advantageous due to its simplicity and reliability, as it does not require cooling systems like superconducting magnets and consumes no electricity to maintain the magnetic field. The use of bricks of magnets is typical for lower-field MRI systems, which are often smaller and more cost-effective.

While resistive and superconducting magnets can also be used in MRI systems, these technologies operate on different principles. Resistive magnets require electrical power to generate a magnetic field and are generally less efficient than permanent magnets. Superconducting magnets, on the other hand, utilize superconducting materials and necessitate cooling with liquid helium to achieve a superconducting state, allowing them to generate very high magnetic fields. However, neither of these types relies on solid blocks of magnets like the permanent magnet does. Therefore, permanent magnet units are distinct in their use of solid, sturdy magnet structures to achieve the required static