Toshiteru Miyasaka1, Toshiaki Taoka1, Toshiaki Akashi1, Kaoru Myouchin1, Masahiko Sakamoto1, Katsutoshi Takayama1, Horoyuki Nakagawa1, Kimihiko Kichikawa1
1Dep. of Radiology, Nara Medical University, Kashihara, Nara, Japan
The magnitude image, which is one of the sources of SWI, seems useful to assess the draining vein of AVM, especially on follow-up. This is because, while draining veins of AVM depicted as low signal structure on SWI, the magnitude image depicts draining veins of AVM as high signal, due to higher concentration of oxy-Hb and higher flow speed within draining vein of AVM.