Meeting Banner
Abstract #3438

Enhancement of Respiratory Navigated 3D Spoiled Gradient-Recalled Echo Sequence with Variable Flip Angle Scheme

Yuji Iwadate1, Anja C.S. Brau2, Hiroyuki Kabasawa1

1Global Applied Science Laboratory, GE Healthcare Japan, Hino, Tokyo, Japan; 2Global Applied Science Laboratory, GE Healthcare, Menlo Park, CA, United States

Respiratory-gated fat-suppressed 3D spoiled gradient-recalled echo with navigator echo (Navigated LAVA) enables 3D T1-weighted imaging of free breathing patients with considerably reduced motion artifacts. In this work, enhanced navigated LAVA was developed to address the spin saturation effect on navigator signal, utilizing a wait insertion and a variable flip angle scheme. Variable flip angle scheme was realized by combination of ramp-up, ramp-down, and attenuation strategies in order to optimize the point spread function. In volunteer imaging, enhanced navigated LAVA not only increased navigator signal but also improved image quality of LAVA itself.

Abstract PDF E-Poster Video

Keywords

accurate acquisition address agent applied array arrow arrows artifact artifacts attenuated attenuation better breathing cardiac caused channel coil combination component components conducted consent considerably contrast degradation degrees description design designed detected detection deterioration developed diaphragm discontinuity done edge edges elongation emphasized enables enhanced enhancement especially even excitation failure free function gated ghost global gradient green half homogeneity immediately implemented improved improving informed injected inserted insertion intensities interleave interleaving japan just laboratory last lava lead linearly liver longer maintaining make matrix modification motion movement much navigated navigator near noisy orange overcome park partial patients percent period produced pulse quality ramp recalled recovery reduce reduced reformatted remarkably respiratory ripple runs saturation schematic scheme science segment segments sensitive slice smaller space spin spoiled spread stabilize start strategy suppressed system taken tried utilizing variable volunteer wait young