Susceptibility Weighted Imaging for evaluation of musculoske
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The detection and characterization of calcium and blood products at musculoskeletal (MSK) lesions have been classically a challenging topic for conventional MRI sequences. Susceptibility Weighted Imaging (SWI) enhances the detection and differentiation between diamagnetic and paramagnetic substances such as calcium and blood.

The presence of blood or calcium in the musculoskeletal (MSK) system may be linked to specific pathological conditions. The ability of MRI for calcium detection is usually limited compared with other techniques such as CT. In a similar manner, the accuracy of MRI for detection and evaluation of hemorrhage in soft tissues is closely linked to the degree of degradation of blood products. Blood and calcium are substances that cause local inhomogeneity of the magnetic field resulting in susceptibility artifacts.

To try to evaluate these substances, specific MRI sequences which are highly sensitive to these local magnetic field inhomogeneities such as Susceptibility Weighted Imaging (SWI) have been developed and successfully applied in the Central Nervous System, but is not much used in MSK.

SWI may increase the overall sensitivity of MRI to detect blood and calcium in several clinical scenarios such as degenerative joint disease or bone and soft tissue lesion assessment and discriminate between both compounds, something which is not always possible with conventional MRI approaches.

European Journal of Radiology
Source: https://doi.org/10.1016/j.ejrad.2021.109611
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