field strength
Magnetic field intensity of an MRI scanner, measured in Tesla, that affects image quality and capabilities.
Full Definition
Field strength refers to the intensity of the static magnetic field in an MRI scanner, measured in Tesla (T), which fundamentally determines image quality, signal-to-noise ratio, and imaging capabilities. Clinical scanners typically operate at 1.5T or 3T, while research systems may use 7T or higher fields. Higher field strengths provide increased spatial resolution and sensitivity for advanced techniques like high-resolution fMRI and diffusion imaging, but also present challenges including increased susceptibility artifacts, radiofrequency heating, and hardware complexity.
Usage
Usage note: Express as '1.5T', '3T', '7T' etc. with no space between number and T.
In Context
- "The 3T field strength enabled submillimeter resolution diffusion imaging in this study." — Imaging protocol description
- "Higher field strength scanners require additional safety precautions for patients with metallic implants." — Safety guidelines