Toshiteru Miyasaka1, Toshiaki Taoka2, Tomoko Ochi2, Toshiaki Akashi2, Kaoru Myochin2, Takeshi Wada2, Katsutoshi Takayama2, Hiroyuki Nakagawa1, Kimihiko Kichikawa2
1Department of Radiology, Nara prefectural Nara hospital, Nara, Japan; 2Department of Radiology, Nara medical university, Kashihara, Nara, Japan
Magnitude images of SWI depicted the majority of the draining veins of dAVF as much bright intensity as TOF MRA. Draining veins, which disappeared on angiography after the treatment, showed lower signal intensity than before treatment on magnitude images and TOF MRA. We speculate that higher concentration of oxy-Hb within draining veins is one of the causes of high signal intensity on magnitude images and the signal intensity was lower after the treatment due to decreased velocity and lower concentration of oxy-Hb on magnitude images.