Figure 6 - available via license: Creative Commons Attribution 4.0 International
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Image simulations: Cartesian vs. non-Cartesian. Here we show the different off-resonance effects from EPI vs. spiral acquisition. In the EPI image, geometric distortion of the brain is visible, including the zoomed-in region in the visual cortex, where the brain has been compressed compared to the original. In the spiral image, there is a large amount of blurring in the frontal cortex due to its location closely superior to the sinuses, noted by the red arrow, but there is less geometric distortion than in EPI.
Source publication
In magnetic resonance imaging (MRI), inhomogeneity in the main magnetic field used for imaging, referred to as off-resonance, can lead to image artifacts ranging from mild to severe depending on the application. Off-resonance artifacts, such as signal loss, geometric distortions, and blurring, can compromise the clinical and scientific utility of M...
Contexts in source publication
Context 1
... ways that off-resonance affects EPI and spiral images at 3T is shown in Fig. 6 (images in Fig. 6 were acquired from a healthy subject after obtaining IRB approved written informed consent). As expected the artifacts in the spiral image are primarily blurring, and the artifacts ...
