Results 161 to 170 of about 3,039 (204)
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Ultrashort Echo Time Double Echo Steady State (UTE-DESS) Imaging with Eddy Current Compensation
ISMRM Annual Meeting, 2023The double echo steady state (DESS) sequence has been investigated extensively due to its short scan time and flexible image contrast achieved from a combination of a free induction decay (FID)-like S+ signal and simulated echo-based S- signal. Ultrashort echo time-based DESS (UTE-DESS) has recently been proposed for imaging of short T2 tissues in the ...
Hyungseok Jang +7 more
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Ultrashort echo time (UTE) MRI of the spine in thalassaemia
The British Journal of Radiology, 2004Back pain is common in adult patients with homozygous thalassaemia, and degenerative disc disease is increasingly recognised as a cause. Ultrashort echo time (UTE) pulse sequences, which are sensitive to the presence of short T(2) relaxation components in tissue produced by iron deposition and other processes, were used to examine the lower thoracic ...
M A, Hall-Craggs +3 more
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Feasibility of ultrashort echo time (UTE) T2* cartilage mapping in the hip: a pilot study
Acta Radiologica, 2021Background Ultrashort echo time (UTE) T2* is sensitive to molecular changes within the deep calcified layer of cartilage. Feasibility of its use in the hip needs to be established to determine suitability for clinical use. Purpose To establish feasibility of UTE T2* cartilage mapping in the hip and determine if differences in regional values exist ...
Tony T Wong +5 more
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Qualitative and quantitative ultrashort echo time (UTE) imaging of cortical bone
Journal of Magnetic Resonance, 2010We describe the use of two-dimensional ultrashort echo time (2D UTE) sequences with minimum TEs of 8 μs to image and quantify cortical bone on a clinical 3T scanner. An adiabatic inversion pulse was used for long T(2) water and fat signal suppression.
Jiang, Du +5 more
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Magnetization Transfer - Ultrashort Echo Time (MT-UTE) Imaging
2012Ultrashort echo time sequences provide the possibility of visualizing tissues with extremely fast signal decay on whole-body MR scanners. For detailed investigations of tissue structure, magnetization transfer (MT) experiments can be performed if ultrashort echo time sequences are combined with MT-preparation schemes.
Fabian Springer +2 more
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ISMRM Annual Meeting, 2023
Optimization of MRF (MR fingerprinting) sequence is important for encoding MR tissue parameters with the maximal SNR for better quantification of representative tissues of WM, GM and CSF. Here, we targeted ultrashort T2 tissues and proposed an optimized acquisition parameter patterns for 3D ultrashort echo time MRF sequence with the goal of achieving ...
Zihan Zhou +6 more
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Optimization of MRF (MR fingerprinting) sequence is important for encoding MR tissue parameters with the maximal SNR for better quantification of representative tissues of WM, GM and CSF. Here, we targeted ultrashort T2 tissues and proposed an optimized acquisition parameter patterns for 3D ultrashort echo time MRF sequence with the goal of achieving ...
Zihan Zhou +6 more
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Magnetic Resonance in Medicine, 2021
PurposeIn this study, we aimed to develop a new technique, ultrashort echo time Cones double echo steady state (UTE‐Cones‐DESS), for highly efficient morphological imaging of musculoskeletal tissues with short T2s. We also proposed a novel, single‐point Dixon (spDixon)‐based approach for fat suppression.MethodsThe UTE‐Cones‐DESS sequence was ...
Hyungseok Jang +5 more
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PurposeIn this study, we aimed to develop a new technique, ultrashort echo time Cones double echo steady state (UTE‐Cones‐DESS), for highly efficient morphological imaging of musculoskeletal tissues with short T2s. We also proposed a novel, single‐point Dixon (spDixon)‐based approach for fat suppression.MethodsThe UTE‐Cones‐DESS sequence was ...
Hyungseok Jang +5 more
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MR-based attenuation correction for PET using an Ultrashort Echo Time (UTE) sequence
2008 IEEE Nuclear Science Symposium Conference Record, 2008One of the limitations of a multimodality PET/MR scanner is the lack of an attenuation map to correct the PET image for attenuation. Some methods have been developed for deriving the attenuation map from a magnetic resonance image. However, the very low signal intensity of cortical bone in images acquired with conventional MR sequences makes it ...
Vincent Keereman +5 more
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Ultrashort-echo time magnetization transfer (UTE-MT) for brain iron imaging
ISMRM Annual MeetingWe have established a novel 3D dual-echo UTE-MT imaging method to assess hyperintense T1w signal in iron-rich brain areas by eliminating the ultra-short T2 constituents of the myelin signal via the magnetization transfer (MT) technique. Our preliminary results show improved positive image contrast in deep brain areas such as the substantia nigra (SN ...
Humberto Monsivais +12 more
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ISMRM Annual Meeting, 2023
Entheses are transition zones connecting flexible tissues such as tendons and ligaments to bone. Conventional MRI sequences detect little or no signal from entheses as a result of their short T2* values. Alternatively, ultrashort echo time MRI (UTE-MRI) with TE<50 μs can be used to image tissues with short T2 and T2* for quantitative ...
Saeed Jerban +9 more
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Entheses are transition zones connecting flexible tissues such as tendons and ligaments to bone. Conventional MRI sequences detect little or no signal from entheses as a result of their short T2* values. Alternatively, ultrashort echo time MRI (UTE-MRI) with TE<50 μs can be used to image tissues with short T2 and T2* for quantitative ...
Saeed Jerban +9 more
openaire +1 more source