The body coil is installed in the magnet and functions both as transmit than also as a receiver coil. This coil has a large measurement field, but does not have the high SNR of special coils. When specific receiver only coils are used (the most surface coils), the body coil serves as the transmit coil.

Bound spins. Protons in water, bound caused hydration at macromolecules. Bound spins have no defined Larmor frequency and are not visible in the image.

Using a care bolus ensures optimal contrast of arterial vessels in contrast enhanced MRA. The center of the k-space is measured as quickly as possible once the contrast agent reaches the region of interest.

An ultrafast gradient echo pulse sequence with data acquisition after an initial 180° (similar to IR) preparation pulse for contrast enhancement.
See Fast Low Angle Shot and Ultrafast Gradient Echo Sequence.

Rate of cryogen (liquid helium) evaporation in superconducting magnets, usually measured in liters of liquid per hour. The boil off rate of cryogen increases during ramping of the magnet and with eddy currents induced in the cryoshields by pulsed field gradients. In calculating cryogen consumption additional transfer and filling losses have to be considered.

See also Cryoshielding and Helium.