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quantitative assessment of proximal femoral cortical bone microstructure using double-echo ultrashort echo time magnetic resonance imaging.
Quant Imaging Med Surg
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Department of Radiology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China.
Background: Quantitative assessment of cortical bone microstructure is crucial for the evaluation of osteoporosis, yet current clinical methods such as dual-energy X-ray absorptiometry (DXA) have many limitations. The quantitative assessment without radiation can be achieved by ultrashort echo time (UTE) magnetic resonance imaging (MRI), where double-echo UTE has high clinical feasibility. However, related studies have mainly focused on distal extremities, and there is a lack of studies on the proximal femur.
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School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, China.
In the original publication [...
View Article and Find Full Text PDFLeveraging Phase Information of 3D Isotropic Ultrashort Echo Time Pulmonary MRI for the Detection of Thoracic Lymphadenopathy: Toward an All-in-One Scan Solution.
Invest Radiol
November 2024
From the Department of Diagnostic and Interventional Radiology, School of Medicine & Klinikum Rechts der Isar, Technical University of Munich, Munich, Germany (S.Z., A.T.V., A.W.M., T.L., F.S., T.H., A.S., J.G., M.R.M., D.C.K., M.G.); Philips GmbH, Hamburg, Germany (K.W.); and Philips North America, Nashville, TN (R.R.).
Background: Ultrashort echo time (UTE) allows imaging of tissues with short relaxation times, but it comes with the expense of long scan times. Magnitude images of UTE magnetic resonance imaging (MRI) are widely used in pulmonary imaging due to excellent parenchymal signal, but have insufficient contrast for other anatomical regions of the thorax. Our work investigates the value of UTE phase images (UTE-Ps)-generated simultaneously from the acquired UTE signal used for the magnitude images-for the detection of thoracic lymph nodes based on water-fat contrast.
View Article and Find Full Text PDFPopulation transfer between degenerate continuum states impulsive stimulated Raman scattering: application to the control of HOD photofragmentation.
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Department of Chemistry, Technical University of Denmark, Kongens Lyngby, Denmark.
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Zero-echo-time sequences in highly inhomogeneous fields.
Magn Reson Med
March 2025
MRILab, Institute for Molecular Imaging and Instrumentation (i3M), Spanish National Research Council (CSIC), Universitat Politècnica de València (UPV), Valencia, Spain.
Purpose: Zero-echo-time (ZTE) sequences have proven a powerful tool for MRI of ultrashort tissues, but they fail to produce useful images in the presence of strong field inhomogeneities (14 000 ppm). Here we seek a method to correct reconstruction artifacts from non-Cartesian acquisitions in highly inhomogeneous , where the standard double-shot gradient-echo approach to field mapping fails.
Methods: We present a technique based on magnetic field maps obtained from two geometric distortion-free point-wise (SPRITE) acquisitions.
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