The energy released by relaxing protons is captured by which device in the MRI scanner?

The energy released by relaxing protons is captured by which device in the MRI scanner?

• A. Transmitter coil
• B. Gradient coil
• C. Main magnet
• D. Receiver antenna

Answer: (D)

When the protons relax after the RF pulse, they emit a small radiofrequency signal. That faint signal is captured by the MRI system’s receive coil, which acts as an antenna to pick up the emitted RF energy and send it to the scanner’s receiver for amplification and digitization to create the image. The main magnet provides the static field for alignment, while gradient coils encode spatial information and the transmitter coil delivers the RF pulse to flip the spins.

When the protons relax after the RF pulse, they emit a small radiofrequency signal. That faint signal is captured by the MRI system’s receive coil, which acts as an antenna to pick up the emitted RF energy and send it to the scanner’s receiver for amplification and digitization to create the image. The main magnet provides the static field for alignment, while gradient coils encode spatial information and the transmitter coil delivers the RF pulse to flip the spins.