INTRODUCTION: Susceptibility-weighted imaging (SWI) is a novel magnetic resonance (MR) technique that exploits the magnetic susceptibility differences of various tissues, such as blood, iron and calcification. This pictorial review covers many clinical conditions illustrating its usefulness. METHODS: SWI consists of using both magnitude and phase images from a high-resolution, three-dimensional fully velocity-compensated gradient echo sequence. Phase mask is created from the MR phase images, and multiplying these with the magnitude images increase the conspicuity of the smaller veins and other sources of susceptibility effects, which is depicted using minimal intensity projection (minIP). RESULTS: The phase images are useful in differentiating between diamagnetic and paramagnetic susceptibility effects of calcium and blood, respectively. This unique MR sequence will help in detecting occult low flow vascular lesions, calcification and cerebral microbleed in various pathologic conditions and aids in characterizing tumors and degenerative diseases of the brain. This sequence also can be used to visualize normal brain structures with conspicuity. CONCLUSION: Susceptibility-weighted imaging is useful in differentiating and characterizing diverse brain pathologies.
INTRODUCTION: Susceptibility-weighted imaging (SWI) is a novel magnetic resonance (MR) technique that exploits the magnetic susceptibility differences of various tissues, such as blood, iron and calcification. This pictorial review covers many clinical conditions illustrating its usefulness. METHODS: SWI consists of using both magnitude and phase images from a high-resolution, three-dimensional fully velocity-compensated gradient echo sequence. Phase mask is created from the MR phase images, and multiplying these with the magnitude images increase the conspicuity of the smaller veins and other sources of susceptibility effects, which is depicted using minimal intensity projection (minIP). RESULTS: The phase images are useful in differentiating between diamagnetic and paramagnetic susceptibility effects of calcium and blood, respectively. This unique MR sequence will help in detecting occult low flow vascular lesions, calcification and cerebral microbleed in various pathologic conditions and aids in characterizing tumors and degenerative diseases of the brain. This sequence also can be used to visualize normal brain structures with conspicuity. CONCLUSION: Susceptibility-weighted imaging is useful in differentiating and characterizing diverse brain pathologies.
Authors: E Mark Haacke; Muhammad Ayaz; Asadullah Khan; Elena S Manova; Bharani Krishnamurthy; Lakshman Gollapalli; Carlo Ciulla; I Kim; Floyd Petersen; Wolff Kirsch Journal: J Magn Reson Imaging Date: 2007-08 Impact factor: 4.813
Authors: Chun-Xue Wu; Li Ma; Xu-Zhu Chen; Xiao-Lin Chen; Yu Chen; Yuan-Li Zhao; Christopher Hess; Helen Kim; Heng-Wei Jin; Jun Ma Journal: World Neurosurg Date: 2018-05-30 Impact factor: 2.104
Authors: Fawn R Connor-Stroud; William D Hopkins; Todd M Preuss; Zachary Johnson; Xiaodong Zhang; Prachi Sharma Journal: Comp Med Date: 2014-06 Impact factor: 0.982
Authors: Jerome Aellen; Eugenio Abela; Sarah E Buerki; Raimund Kottke; Elisabeth Springer; Kaspar Schindler; Christian Weisstanner; Marwan El-Koussy; Gerhard Schroth; Roland Wiest; Jan Gralla; Rajeev K Verma Journal: Eur Radiol Date: 2014-08-06 Impact factor: 5.315