Premium
In‐phase zero TE musculoskeletal imaging
Author(s) -
Engström Mathias,
McKin Graeme,
Cozzini Cristina,
Wiesinger Florian
Publication year - 2020
Publication title -
magnetic resonance in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.696
H-Index - 225
eISSN - 1522-2594
pISSN - 0740-3194
DOI - 10.1002/mrm.27928
Subject(s) - artifact (error) , phase (matter) , amplitude , attenuation , interference (communication) , magnetic resonance imaging , sampling (signal processing) , signal (programming language) , nuclear magnetic resonance , computer science , biomedical engineering , materials science , physics , optics , artificial intelligence , radiology , detector , medicine , computer network , channel (broadcasting) , quantum mechanics , programming language
Purpose To introduce a new method for in‐phase zero TE (ipZTE) musculoskeletal MR imaging. Methods ZTE is a 3D radial imaging method, which is sensitive to chemical shift off‐resonance signal interference, especially around fat–water tissue interfaces. The ipZTE method addresses this fat–water chemical shift artifact by acquiring each 3D radial spoke at least twice with varying readout gradient amplitude and hence varying effective sampling time. Using k‐space‐based chemical shift decomposition, the acquired data is then reconstructed into an in‐phase ZTE image and an out‐of‐phase disturbance. Results The ipZTE method was tested for knee, pelvis, brain, and whole‐body. The obtained images demonstrate exceptional soft‐tissue uniformity free from out‐of‐phase disturbances apparent in the original ZTE images. The chemical shift decomposition was found to improve SNR at the cost of reduced image resolution. Conclusion The ipZTE method can be used as an averaging mechanism to eliminate fat–water chemical shift artifacts and improve SNR. The method is expected to improve ZTE‐based musculoskeletal imaging and pseudo CT conversion as required for PET/MR attenuation correction and MR‐guided radiation therapy planning.