The magic angle is an MRI artifact that occurs in sequences with a short TE (less than 32 ms) - T1 weighted, proton density weighted, and gradient echo sequences. It is confined to regions of tightly bound collagen at 54.74° from the main magnetic field (B 0), and appears hyperintense, thus potentially being mistaken for tendinopathy. Normal

The magic angle effect is important in the clinical MR imaging of certain tissues that are highly structured and are oriented obliquely to the main magnetic field (especially tendons, cartilage, and peripheral nerves). The MR signal may spuriously increase near the magic angle mimicking pathology.

The magic angle artifact is an MRI artifact that occurs due to the phenomenon of nuclear dipole-dipole interactions. It appears as a bright signal on T1-weighted images and can occur in tissues with highly organized collagen fibers, such as tendons, ligaments, and cartilage.

Magic angle effect seen on MRI of the shoulder. In nuclear magnetic resonance (NMR) spectroscopy, three prominent nuclear magnetic interactions, dipolar coupling, chemical shift anisotropy (CSA), and first-order quadrupolar coupling, depend on the orientation of the interaction tensor with the external magnetic field.. By spinning the sample around a given axis, their average angular ...