Final answer:
SNR in MRI involves the magnetic field, proton imaging, active transport, and spatial resolution.
Step-by-step explanation:
Magnetic Field: MRI uses a superconducting magnet to create a magnetic field, typically between 1 and 2 T in strength, which allows for detailed imaging of structures and organ functions.
Proton Imaging: In most medical images, protons (hydrogen nuclei) are imaged as they respond differently to slight changes in the magnetic field. The location and density of protons provide medically useful information about organ function, tissue condition, and the shape of structures.
Active Transport: MRI can be used to follow the movement of ions across membranes, providing information on active transport, osmosis, dialysis, and other phenomena.
Spatial Resolution: MRI provides excellent spatial resolution, allowing for detailed information about tumors, strokes, injuries, infections, and more.