Where do we expect to see the highest heat deposition?

In the context of magnetic resonance imaging (MRI), heat deposition can be influenced by several factors, including the presence of radiofrequency (RF) fields, conductive materials, and the varying locations concerning the RF coils.

The highest heat deposition is anticipated in the near field, especially under RF rungs and around electrically conductive materials. The near field is where the magnetic and electric fields from the RF coils are strongest and where the interactions that lead to heat generation primarily occur. This is due to the fact that the RF energy is absorbed more significantly in these areas as the fields are more concentrated, leading to increased heating effects.

Under RF rungs, where the RF fields are generated, heat deposition rises due to the direct exposure to the RF energy. Additionally, conductive materials can also contribute to localized heating as they can concentrate electromagnetic fields due to their ability to absorb and re-emit RF energy.

Thus, since heat deposition can occur significantly in all these scenarios—under RF rungs, around electrically conductive materials, and in the near field—it is accurate to assert that the highest heat deposition is expected in all these areas, making 'all of the above' the most comprehensive answer. This holistic understanding is crucial for MRI safety practices, as it informs operators where