Ultra-fast steady state free precession and its application to in vivo 1H morphological and functional lung imaging at 1.5 tesla

Purpose: The speed limit for three-dimensional Fourier-encoded steady state free precession (SSFP) imaging is explored on a clinical whole body system and pushed toward a pulse repetition time (TR) close to or even below the 1ms regime; in the following referred to as ultra-fast SSFP imaging. Methods: To this end, contemporary optimization strategies, such as efficient gradient switching patterns, partial echoes, ramp sampling techniques, and a target-related design of excitation pulses were applied to explore the lower boundaries in TR for SSFP-based Cartesian imaging. Results: Generally, minimal TR was limited in vivo by peripheral nerve stimulation, allowing a TR approximate to 1ms for isotropic resolutions down to about 2 mm. As a result, ultra-fast balanced SSFP provides artifact-free images even for targets with severe susceptibility variations, and native high-resolution structural and functional in vivo H-1 imaging of the human lung is demonstrated at 1.5 T. Conclusion: On clinical whole body MRI systems, the TR of SSFP-based Cartesian imaging can be pushed toward the 1ms regime. As a result, ultra-fast SSFP protocols might represent a promising new powerful approach for SSFP-based imaging, not only for lung but also in a variety of clinical and scientific applications. Magn Reson Med 70:657-663, 2013. (c) 2013 Wiley Periodicals, Inc.