gradient coil
MRI hardware component that creates spatially varying magnetic fields for image encoding.
Full Definition
Gradient coils are specialized electromagnetic coils in MRI scanners that generate linear magnetic field gradients in the x, y, and z directions, enabling spatial encoding of the MRI signal. These rapidly switching magnetic fields allow slice selection, frequency encoding, and phase encoding necessary for image formation. Gradient coil performance directly impacts image quality, with stronger gradients enabling faster acquisition, higher resolution, and advanced techniques like diffusion imaging, though they also contribute to acoustic noise and patient heating concerns.
Usage
Usage note: Use 'gradient coil' (singular) for the system, 'gradient coils' (plural) for multiple coils.
In Context
- "The upgraded gradient coils enabled diffusion imaging with b-values up to 3000 s/mm²." — Equipment specification
- "Gradient coil heating limits the duty cycle for rapid imaging sequences." — Technical safety documentation