Which of the following statements are true regarding patient heating during MRI?

The statement that larger patients will heat up the most during MRI is accurate because it relates to the principles of radiofrequency (RF) energy absorption in tissue. In MRI, RF pulses are used to excite protons in the body, which can lead to localized heating. The amount of heat generated is influenced by the volume of tissue being exposed to RF energy. Larger patients typically have a greater volume of tissue, which means there is more opportunity for RF absorption, leading to a higher potential for heating.

Additionally, the RF fields in an MRI scanner can create an uneven distribution of energy absorption, depending on the size and shape of the patient. This uneven distribution can further contribute to larger patients experiencing more heat during a scan compared to smaller patients, who have less tissue volume to absorb the RF energy.

In contrast, the notion that smaller patients heat up the most or that larger patients are ferromagnetic is not supported by the underlying physics of MRI and biological tissue interactions with RF energy. Ferromagnetism is unrelated to body size and concerns only specific metals that can affect safety in an MRI environment.