Session 5: Monitoring the hemodynamics of the brain
The roles of ASL, DTI, MRA, PWI and SWI in neurological diseases
Dr. E. Mark Haacke is the primary inventor of SWI along with his fellow co-inventors both Dr. Juergen Reichenbach and Dr. Yi Wang.
We have developed a new type of contrast in MRI different from spin density, T1, or T2 imaging. This new method exploits the susceptibility differences between tissues. We refer to this method as Susceptibility Weighted Imaging*. SWI uses a fully velocity compensated, three dimensional, rf spoiled, high-resolution, 3D 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. If the size of the source is smaller than a voxel then the signal from this substance will beat against that of its neighbor creating a powerful partial volume effect. SWI can be run on any manufacturer’s machine at field strengths of 1.0T, 1.5T, 3.0T and higher.
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