Rapid NMR imaging of dynamic processes using the FLASII technique

TLDR

FLASH imaging is a rapid NMR technique that can acquire abdominal images free of respiratory or peristaltic motion artifacts. The method uses 15° RF excitation pulses and captures a gradient‑echo free induction decay, enabling imaging of dynamic processes with time constants shorter than the ~2 s acquisition time for a 128 × 128‑pixel image. Experiments on flow phantoms and rabbits produced cardiac‑motion‑free heart images without gating. © 1986 Academic Press, Inc.

Abstract

Abstract FLASH (Fast Low‐Angle SHot) imaging is a new method for rapid NMR imaging which has been demonstrated to provide abdominal images without artifacts due to respiratory or peristaltic motions. The sequence typically employs 15° radiofrequency excitation pulses and acquires a free induction decay signal in the form of a gradient echo. Here FLASH images are recorded in the presence of dynamic processes with time constants even smaller than the measuring time of about 2 s for an image with a 128 × 128‐pixel resolution. Experiments are carried out on flow phantoms and on rabbits yielding heart images without gating of the cardiac motion. © 1986 Academic Press, Inc.