This paper talks about how tattoos can heat up during an MRI scan at 1.5 T and 3 T field strengths. The researchers looked at different types of tattoos with varying shapes, positions, pigments, sizes, and the gaps between them. They used special simulations to measure how much energy (SAR) is absorbed and how much the temperature rises around the tattoos. The study found that tattoos can affect how the electric field from the MRI spreads out and how much energy is absorbed by the skin. The heating was more noticeable around sharp edges, long strips, and circular shapes of tattoos. The shape of the tattoo was a key factor in how much the skin temperature would rise. The position and size of tattoos also played a role in the heating. The researchers also looked at what happens when someone has multiple tattoos. The results showed that RF heating from multiple tattoos is very different from a single tattoo. It doesnt just add up like you might expect from each tattoos individual effect.