Fast online spectral-spatial pulse design for subject-specific fat saturation in cervical spine and foot imaging at 1.5 T.

Eisen C, Liebig P, Herrler J, Ritter D, Lévy S, Uder M, Nagel AM, Grodzki D (2024)

Publication Language: English

Publication Type: Journal article

Publication year: 2024

Journal

Magnetic Resonance Materials in Physics Biology and Medicine Springer Verlag (Germany)

Book Volume: 37

Pages Range: 257-272

Journal Issue: 2

DOI: 10.1007/s10334-024-01149-8

Abstract

OBJECTIVE: To compensate subject-specific field inhomogeneities and enhance fat pre-saturation with a fast online individual spectral-spatial (SPSP) single-channel pulse design. METHODS: The RF shape is calculated online using subject-specific field maps and a predefined excitation k-space trajectory. Calculation acceleration options are explored to increase clinical viability. Four optimization configurations are compared to a standard Gaussian spectral selective pre-saturation pulse and to a Dixon acquisition using phantom and volunteer (N = 5) data at 1.5 T with a turbo spin echo (TSE) sequence. Measurements and simulations are conducted across various body parts and image orientations. RESULTS: Phantom measurements demonstrate up to a 3.5-fold reduction in residual fat signal compared to Gaussian fat saturation. In vivo evaluations show improvements up to sixfold for dorsal subcutaneous fat in sagittal cervical spine acquisitions. The versatility of the tailored trajectory is confirmed through sagittal foot/ankle, coronal, and transversal cervical spine experiments. Additional measurements indicate that excitation field (B1) information can be disregarded at 1.5 T. Acceleration methods reduce computation time to a few seconds. DISCUSSION: An individual pulse design that primarily compensates for main field (B0) inhomogeneities in fat pre-saturation is successfully implemented within an online "push-button" workflow. Both fat saturation homogeneity and the level of suppression are improved.

Authors with CRIS profile

Christian Eisen Institute of Radiology Michael Uder Lehrstuhl für Diagnostische Radiologie Armin Michael Nagel Professur für metabolische und funktionelle MR-Bildgebung

Involved external institutions

Siemens Healthineers Australia AU Australia (AU) Siemens AG, Healthcare Sector DE Germany (DE)

How to cite

APA:

Eisen, C., Liebig, P., Herrler, J., Ritter, D., Lévy, S., Uder, M.,... Grodzki, D. (2024). Fast online spectral-spatial pulse design for subject-specific fat saturation in cervical spine and foot imaging at 1.5 T. Magnetic Resonance Materials in Physics Biology and Medicine, 37(2), 257-272. https://doi.org/10.1007/s10334-024-01149-8

MLA:

Eisen, Christian, et al. "Fast online spectral-spatial pulse design for subject-specific fat saturation in cervical spine and foot imaging at 1.5 T." Magnetic Resonance Materials in Physics Biology and Medicine 37.2 (2024): 257-272.

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