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Rapid NMR imaging of dynamic processes using the FLASH technique.

J Frahm, A Haase, D Matthaei

Magnetic Resonance in Medicine

|April 1, 1986

Summary

Fast Low-Angle SHot (FLASH) imaging provides artifact-free abdominal images, even with rapid dynamic processes. This rapid NMR imaging technique successfully captured heart images without gating, demonstrating its effectiveness in motion-sensitive applications.

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Area of Science:

Magnetic Resonance Imaging (MRI)
Medical Imaging Technology

Background:

Respiratory and peristaltic motions often cause artifacts in abdominal MRI.
Existing MRI techniques may struggle with imaging dynamic processes due to motion.

Purpose of the Study:

To evaluate the efficacy of Fast Low-Angle SHot (FLASH) imaging for rapid NMR imaging.
To demonstrate FLASH imaging's ability to produce artifact-free images in the presence of dynamic processes.

Main Methods:

Utilized a FLASH imaging sequence with 15-degree radiofrequency excitation pulses.
Acquired free induction decay signals using a gradient echo.
Recorded FLASH images with a 128 x 128-pixel resolution in approximately 2 seconds.

Main Results:

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Achieved abdominal images free from respiratory and peristaltic motion artifacts.
Successfully recorded FLASH images of dynamic processes with time constants smaller than the image acquisition time.
Obtained clear heart images from rabbit experiments without the need for cardiac gating.

Conclusions:

FLASH imaging is a highly effective method for rapid NMR imaging, minimizing motion-related artifacts.
The technique is suitable for imaging abdominal regions and dynamic physiological processes.
FLASH imaging shows potential for cardiac imaging applications where motion is a significant challenge.