In‐phase zero TE musculoskeletal imaging
| Autor: | C. Cozzini, Graeme C. McKinnon, Florian Wiesinger, Mathias Engström |
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| Rok vydání: | 2019 |
| Předmět: |
Phase (waves)
Signal-To-Noise Ratio Multimodal Imaging 030218 nuclear medicine & medical imaging 03 medical and health sciences Imaging Three-Dimensional 0302 clinical medicine Optics Image Processing Computer-Assisted Humans Whole Body Imaging Radiology Nuclear Medicine and imaging Muscle Skeletal Image resolution Signal interference Physics Artifact (error) Musculoskeletal imaging business.industry Radiotherapy Planning Computer-Assisted Zero (complex analysis) Brain Water Magnetic Resonance Imaging Amplitude Adipose Tissue Artifacts Tomography X-Ray Computed business Correction for attenuation Algorithms 030217 neurology & neurosurgery |
| Zdroj: | Magnetic Resonance in Medicine. 83:195-202 |
| ISSN: | 1522-2594 0740-3194 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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