Resonance - Video Lesson

Hey, everybody. Welcome to today's lesson on the basic principles of MRI. This lesson focuses on resonance, which is the phenomenon that allows us to see the MRI image. It is the resonance in magnetic resonance imaging. This lesson also discusses the radio frequency or RF excitation pulse, the impact of the RF excitation pulse on the hydrogen nuclei, and how the magnetization changes when the hydrogen nuclei are exposed to an RF excitation pulse. First, let's define resonance. In MRI, resonance is what happens when MR active nuclei interact with an RF pulse at a specific frequency, namely their Larmor frequency. Remember that each m r active nuclei has its own unique Larmor frequency. And in MRI, we primarily focus on hydrogen nuclei. Hydrogen nuclei will only experience resonance if the RF pulse has a frequency equal to the Larmor frequency of