Magnetic Resonance Imaging: Basic Principles
                                             Orhan  Konez, MD                                Türkçe
This case is presented by Hakan Mutlu, MD.  
Case #3T1W Knee MRI

T1 weighted MR image of the knee. Findings and Diagnosis?

Findings / Diagnosis / Discussion: There are bilateral soft tissue signal abnormalities seen in the lower section of the image. This artifact is known as "Wrap Around artifact" or "Aliasing". The cause of this artifact is to use a small field of view (FOV), resulting in undersampling in k-space.  

 
This artifact can be eliminated from the image by selecting a larger FOV (see the image on the right).  Saturation bands can also be the solution. 

 

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