Which of the following components is used to excite hydrogen in the patient during an MRI scan?

The component used to excite hydrogen in the patient during an MRI scan is the RF transmitter. This device emits radiofrequency (RF) pulses that specifically target the hydrogen protons in the body. When these protons are exposed to the RF energy from the transmitter, they absorb the energy and are temporarily knocked out of their equilibrium state. Once the RF pulse is stopped, the protons begin to relax back to their original state, releasing energy in the form of signals that the MRI system can detect.

This is essential for generating the images produced in MRI scans, as the signals emitted during the relaxation process provide the contrast and information needed to create detailed images of the internal structures of the body. The RF transmitter plays a crucial role in this excitation process, making it the correct answer in understanding the function of components used in MRI technology.