navigator echo

a method of respiratory gating which see, used in magnetic resonance imaging to limit respiratory motion artifact; a signal is derived from the top of the diaphragm, and image data are collected only when it is in a selected range.

Farlex Partner Medical Dictionary © Farlex 2012

nav·i·ga·tor ech·o

(nav'i-gā'tŏr ek'ō)

A method of respiratory gating used in magnetic resonance imaging to limit respiratory motionartifact; a signal is derived from the top of the diaphragm, and image data are collected only when it is in a selected range.

Medical Dictionary for the Health Professions and Nursing © Farlex 2012

Mentioned in ?

respiratory gating

References in periodicals archive ?

The DWI protocol can be used with a variety of MRI pulse sequences, including fast spin echo single shot, high-speed STEAM (stimulated echo acquisition mode) imaging, incoherent gradient echo, magnetization prepared rapid gradient echo, echo-planar imaging and navigator echo.[14] However, the pulse sequences must generate signals fairly quickly to detect areas of early ischemia.

The navigator echo can be added to any pulse sequence to decrease motion artifact.

Navigator echo is a standard spin echo sequence that can be used with any of the pulse sequences previously described to decrease motion artifact.[11, 22] The navigator echo method was modified to correct phase errors from rotation and translation motions in the diffusion-encoding interval.[11] It uses an additional nonphase encoded echo that is acquired before the imaging echo.

Detection of acute stroke with diffusion-weighted MRI

Where patients are unable to hold their breath, respiratory gating can also be incorporated, either using a belt around the abdomen or monitoring the liver-lung interface using navigator echoes, which are incorporated in some MRI pulse sequences.