Gradient Field Distortion - Video Lesson

Hey everybody. Welcome to today's lesson on artifacts in MRI. This lesson focuses on gradient field distortions, which lead to spatial misregistration and geometric inaccuracies in the MRI image. Understanding gradient field distortion is essential for MRI technologists and clinicians because these distortions can affect anatomic accuracy, measurement reliability, and image interpretation. Let's get started. Gradient field distortion refers to spatial inaccuracies in an MR image that occur when gradient magnetic fields deviate from perfect linearity across the imaging volume. In MRI, gradients are designed to produce a linear change in static magnetic field strength along a specific axis This linearity allows the system to assign precise spatial locations to signal data during frequency and phase encoding in slice selection. When gradients are perfectly linear, equal changes in position correspond to equal changes in magnetic field strength. However, in