2017_IGRT course book

1D MRI, Navigator echos (NE) 15 ms per acquisition

• In diagnostics used to track/gate respiration • Imaging stack is moved according to NE signal • Diaphragm monitored • Can be positioned anywhere in any orientation

1D MRI signal

Time

Monitoring breathing at superior side of liver

Bas RaayMakers

ESTRO IGRT 2017