Journal ArticleDOI
In-phase zero TE musculoskeletal imaging.
TLDR
A new method for in‐phase zero TE (ipZTE) musculoskeletal MR imaging and its applications in medicine and sport are introduced.Abstract:
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.read more
Citations
More filters
Journal ArticleDOI
Silent zero TE MR neuroimaging: Current state-of-the-art and future directions.
Emil Ljungberg,Nikou L. Damestani,Tobias C. Wood,David J. Lythgoe,Fernando Zelaya,Steven Williams,Ana Beatriz Solana,Gareth J. Barker,Florian Wiesinger +8 more
TL;DR: The main concepts behind ZTE imaging are described with a focus on conceptual understanding of the imaging sequences, relevant acquisition parameters, commonly observed image artefacts, and image contrasts, and a range of methods for anatomical and functional neuroimaging are described.
Journal ArticleDOI
Zero Echo Time Musculoskeletal MRI: Technique, Optimization, Applications, and Pitfalls.
TL;DR: Despite isotropic or near-isotropic three-dimensional (3D) imaging capabilities of the ZTE sequence, spatial resolution in this technique is still inferior to that of radiography and CT, and 3D volume renderings are currently time-consuming and require postprocessing software that features segmentation and manual contouring.
Journal ArticleDOI
Qualitative and quantitative analysis of 3D T1 Silent imaging.
Francesca Di Giuliano,Silvia Minosse,Eliseo Picchi,Valentina Ferrazzoli,Valerio Da Ros,M. Muto,Chiara Adriana Pistolese,Francesco Garaci,Roberto Floris +8 more
TL;DR: In this paper, the authors compared brain magnetic resonance imaging (MRI) using T1 3D Silent and fast T 1 3D Gradient-Echo (GRE) BRAin VOlume (known as BRAVO) sequences.
Journal ArticleDOI
Zero-TE MRI: principles and applications in the head and neck
Florian Wiesinger,Mai-Lan Ho +1 more
TL;DR: The imaging physics of ZTE including pulse sequence options, practical limitations, and image reconstruction are reviewed, and optimization of settings for ZTE bone neuroimaging including acquisition, processing, segmentation, synthetic CT generation, and artifacts are discussed.
Journal ArticleDOI
Zero-TE MRI: Potential Applications in the Oral Cavity and Oropharynx.
TL;DR: Zero-echo time (ZTE) magnetic resonance imaging (MRI) is the newest in a family of MRI pulse sequences that involve ultrafast sequence readouts, permitting visualization of short-T2 tissues such as cortical bone as discussed by the authors.
References
More filters
Journal ArticleDOI
Selection of a convolution function for Fourier inversion using gridding (computerised tomography application)
TL;DR: The authors compare the artifact introduced into the image for various convolving functions of different sizes, including the Kaiser-Bessel window and the zero-order prolate spheroidal wave function (PSWF).
Journal ArticleDOI
Actual flip-angle imaging in the pulsed steady state: a method for rapid three-dimensional mapping of the transmitted radiofrequency field.
TL;DR: The AFI method overcomes the limitation of previous methods that required long relaxation delays between sequence repetitions and is useful for time‐efficient whole‐body B1 mapping and correction of T1 maps obtained using a variable FA technique in the presence of nonuniform RF excitation.
Journal ArticleDOI
Snapshot FLASH MRI. Applications to T1, T2, and chemical-shift imaging.
TL;DR: Extensions to real‐time MRI of blood vessels, diffusion coefficients, combination with two‐dimensional MR spectroscopy experiments, and other nuclei are discussed.
Journal ArticleDOI
B1 mapping by Bloch-Siegert shift.
TL;DR: In vivo Bloch‐Siegert B1 mapping with 25 sec/slice is demonstrated to be quantitatively comparable to a 21‐min double‐angle map, enabling robust, high‐resolution B 1+ mapping in a clinically acceptable time frame.
Journal ArticleDOI
Imaging of the active B1 field in vivo.
Rudolf Stollberger,Paul Wach +1 more
TL;DR: With the described method the active B1 field can be determined in vivo in 23 cross‐sections in less than 6 min, and the stability and accuracy of the presented method is shown by several phantom and in vivo measurements.