Results 211 to 220 of about 1,009,280 (268)

Spatially Aware Acquisition‐Independent Deep Learning for IVIM MRI Parameter Estimation in Patients With Esophageal Cancer

open access: yesMagnetic Resonance in Medicine, EarlyView.
ABSTRACT Purpose Neural controlled differential equations (NCDEs) recently emerged as a robust deep learning approach for quantitative MRI parameter estimation. NCDEs offer flexibility to changes in acquisition protocols by modeling the signal evolution dynamics. However, NCDE implementations operate on a voxel‐by‐voxel basis and cannot exploit spatial
Daan Kuppens   +5 more
wiley   +1 more source

Predicting Mesoscopic Larmor Frequency Shifts in Ex Vivo Porcine Optic Nerve

open access: yesMagnetic Resonance in Medicine, EarlyView.
ABSTRACT Purpose Larmor frequency shifts in white matter (WM) vary with fiber orientation due to anisotropic microstructure. Since clinical voxels are significantly larger than these microscopic frequency variations, the measured signal represents a bulk average of local shifts.
Anders Dyhr Sandgaard   +9 more
wiley   +1 more source

Simplified Anisotropic IVIM Using Spherical Means and an Application in the Placenta

open access: yesMagnetic Resonance in Medicine, EarlyView.
ABSTRACT Purpose To reduce the complexity associated with anisotropic IVIM modeling, we derived two simplified diffusion MRI models that map the apparent diffusivity, relative proportions, and anisotropy of perfusion‐ and diffusion‐related signal components and demonstrated them in placenta scans.
Paddy J. Slator   +8 more
wiley   +1 more source

Self‐Correction of B0 Drift and Trajectory Error in Alternating Unbalanced SSFP‐FID and SSFP‐ECHO (AUSFIDE)‐Based 3D Transverse Relaxometry of the Human Brain

open access: yesMagnetic Resonance in Medicine, EarlyView.
ABSTRACT Purpose The alternating unbalanced SSFP (AUSFIDE) pulse sequence, which consists of multi‐echo trains of SSFP‐FID and SSFP‐ECHO modules, enables rapid estimation of R2 and R2′, but is prone to errors from temporal drift of the main magnetic field (B0) and k‐space trajectory mismatch.
Eunseo Bae   +5 more
wiley   +1 more source

Prandial Effects on Intravoxel Incoherent Motion Quantification in the Liver

open access: yesMagnetic Resonance in Medicine, EarlyView.
ABSTRACT Purpose To evaluate the feasibility of detecting prandial (i.e., meal) induced changes in microvascular flow in the liver, including changes in the spatial distribution of flow velocities, using intravoxel incoherent motion (IVIM) MRI. Methods Thirteen (n = 13) healthy volunteers underwent two liver MR exams: one preprandial after fasting and ...
Gregory Simchick   +4 more
wiley   +1 more source

Sustainable strategies for enhancing maize yields, nutrition, and economic security through legume intercropping in semi-arid regions. [PDF]

open access: yesBMC Plant Biol
Sannagoudar MS   +14 more
europepmc   +1 more source

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