Are there any disadvantages or challenges at 3T compared to 1.5T?
Yes. First T1 parameters are longer, therefore needing particular optimization of the protocols so that contrast similar to 1.5T is obtained. In addition, Specific Absorption Rate (SAR – or the energy deposited in the body by the RadioFrequency Coils) increases by a factor of 4, when going from 1.5T to 3T. This means that SAR limits –set for patient safety – are more rapidly reached, needing alternative development to ensure fast imaging with great contrast, and best patient safety. This is the basis for the unique Siemens 3TCare program. Safety data at 3T are sparse. They are less than 15 sites around the world equipped with a whole set of local coils and a body coil and therefore using 3T for routine clinical work. This means that the information regarding patient safety is sparse. Susceptibility effects associated with fat, the frequency difference between 1H in water and fat, can make fat suppression difficult. Cost is increased.
