What is the role of receive coils in MRI?

The role of receive coils in MRI is primarily to act as antennas that detect the signals emitted from the body after the radiofrequency (RF) pulses are applied. When tissues are exposed to the RF pulses, they emit signals as they return to their equilibrium state. Receive coils are specifically designed to capture these weak signals efficiently.

While receive coils do not generate RF power or store energy, they are vitally important in the image acquisition process. They contribute to the overall signal-to-noise ratio, which can significantly affect image quality. However, the statement regarding them being "antenna only" simplifies their function, as receive coils perform the critical task of signal reception, directly influencing image quality. The idea that they simply act as antennas does not do justice to their importance in the MRI system, where their design and placement can lead to substantial enhancements in the overall imaging process and achieve better signal capture across various conditions.

Therefore, the emphasis on their role as transmitters is misleading, and it is crucial to recognize that receive coils play a fundamental role in collecting and transmitting the signals that form the basis of the MRI images.