SWI (Susceptibility Weighted Imaging)

Discover SPIN SWI

Patented technology*​
Enhanced contrast magnitude image which is sensitive to venous blood, hemorrhage and iron storage​
Better diagnosis of disease​
Better follow up for longitudinal studies​
Opportunity to open new doors in clinical MRI

How does SWI work?

Susceptibility Weighted Imaging utilizes both magnitude and phase information from a fully velocity compensated, three-dimensional, rf spoiled, high-resolution, gradient echo scan. Signal from substances with different susceptibilities than their neighboring tissues (such as venous blood, or hemorrhage, for example) will become out of phase with adjacent tissues at sufficiently long echo times. Even if the size of the source is smaller than a voxel, the powerful partial volume effect together with phase masking will generate significant contrast.  SWI can be run on any manufacturer’s machine at field strengths of 1.0T, 1.5T, 3.0T and higher.


  • Filtering of phase images to reduce unwanted field effects
  • Creating a phase mask image
  • Operating on the magnitude image with the phase mask
  • Taking a minimum intensity projection over neighboring slices
*The mechanisms behind susceptibility weighted imaging are protected via US Patent 6,501,272 B1 issued 31 December, 2002.  Dr. E. Mark Haacke is the primary inventor of SWI along with his fellow co-inventors both Dr. Juergen Reichenbach and Dr. Yi Wang.
The SPIN-Research software download link can be found below, at our spinoff company, SpinTech, Inc.  Thank you.
Spin software

Magnetic Resonance Innovations, Inc. 
30200 Telegraph Road Ste. 104
Bingham Farms, MI 48025
United States of America


Email: [email protected]
Fax: +1 (313) 758 0068
Tel: +1 (313) 758 0065
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