Off resonance pulses - Questions and Answers in MRI
What happens if the B 1 field is applied "off resonance" (i.e., not exactly at the Larmor frequency)? In previous Q&A's I was careful to say that the 1 field needed to be applied at a frequency near the Larmor frequency.
The Importance of k -Space Trajectory on Off-Resonance Artifact …
Off-resonance artifacts arise from both magnetic field inhomogeneity and “chemical shift”. With the top-down trajectory, off-resonance introduces the relatively simple and well-understood shift artifact (14, 15), which arises from a linear accumulation of phase across k-space.
Off-resonance artifact correction for magnetic resonance …
Off-resonance artifacts, such as signal loss, geometric distortions, and blurring, can compromise the clinical and scientific utility of MR images. In this review, we describe sources of off-resonance in MRI, how off-resonance affects images, and strategies to prevent and correct for off-resonance.
3650 - ISMRM
Off-resonance is a type of artifact that deteriorates the quality of MR images by introducing blurring and/or distortion. 1 The main causes of this effect are B 0 field inhomogeneities, tissue susceptibilities and chemical shift. 2 Phase from spins precessing at a frequency different than Larmor accumulates across the read-out direction.
An integrated approach to correction for off-resonance effects …
In this paper we describe a method for retrospective estimation and correction of eddy current (EC)-induced distortions and subject movement in diffusion imaging.
MRI - Off Resonance - MR-TIP: Database
An off resonance radio frequency (RF) pulse saturates macromolecular protons to make them invisible (caused by their ultra-short T2* relaxation times). The MRI signal from semi-solid tissue like brain parenchyma is reduced, and the signal from …
NMR Spectroscopy Off Resonance - LabWiki - AAPT
Participants will learn the basics of NMR physics, how to set up and control pulse sequence parameters, how to use such sequences to measure relaxation times, and how to interpret the signal produced when the RF frequency is tuned away from resonance.
[2205.01028] Off-resonance artifact correction for magnetic resonance …
2022年5月2日 · Off-resonance artifacts, such as signal loss, geometric distortions, and blurring, can compromise the clinical and scientific utility of MR images. In this review, we describe sources of off-resonance in MRI, how off-resonance affects images, and strategies to prevent and correct for off-resonance.
Off-resonance artifacts in magnetic resonance imaging (MRI) are visual distortions that occur when the actual res-onant frequencies of spins within the imaging volume dif-fer from the expected frequencies used to encode spatial information.
Volumetric Reconstruction Resolves Off-Resonance Artifacts in …
2023年11月22日 · Off-resonance artifacts in magnetic resonance imaging (MRI) are visual distortions that occur when the actual resonant frequencies of spins within the imaging volume differ from the expected frequencies used to encode spatial information.
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