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01.11.2012 | Diagnostic Neuroradiology

Application of susceptibility weighted imaging (SWI) for evaluation of draining veins of arteriovenous malformation: utility of magnitude images

verfasst von: Toshiteru Miyasaka, Toshiaki Taoka, Hiroyuki Nakagawa, Takeshi Wada, Katsutoshi Takayama, Kaoru Myochin, Masahiko Sakamoto, Tomoko Ochi, Toshiaki Akashi, Kimihiko Kichikawa

Erschienen in: Neuroradiology | Ausgabe 11/2012

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Abstract

Introduction

The current study evaluated the signal characteristics of susceptibility weighted imaging (SWI) of arteriovenous malformation (AVM), especially for draining veins. For this purpose, we identified the draining veins of the AVM on angiography and evaluated the signal on magnitude image for SWI (SWI-mag) and minimum intensity projection image (SWI-minIP).

Methods

Subjects were 14 cases with angiographically proven AVM. SWI-mag, SWI-minIP, and time-of-flight (TOF) magnetic resonance angiography were acquired. For the draining veins of the AVM identified on angiography, we analyzed signal intensity on the images listed above, and classified it into hyperintensity (hyper), mixed intensity (mixed), hypointensity (hypo), and no visualization.

Results

On the analysis of 27 angiographically proven draining veins, 19 draining veins were classified as hyper, 3 as mixed, 0 as hypo, and 6 as no visualization on SWI-mag. On TOF images, 21 draining veins were classified as hyper, 2 as mixed, 0 as hypo, and 4 as no visualization, while 6 draining veins did not show hyperintensity on TOF, and SWI-mag visualized 3 of these 6 veins as hyper.

Conclusion

SWI-mag depicted most draining veins of AVM as hyperintensity. We speculate that this is mainly due to the higher concentration of oxygenated hemoglobin (oxy-Hb) and inflow effect of the draining vein. SWI-mag seems to be useful in the analysis and follow-up for AVM as the signal on the image may reflect physiological status.

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Titel: Application of susceptibility weighted imaging (SWI) for evaluation of draining veins of arteriovenous malformation: utility of magnitude images
verfasst von: Toshiteru Miyasaka
Toshiaki Taoka
Hiroyuki Nakagawa
Takeshi Wada
Katsutoshi Takayama
Kaoru Myochin
Masahiko Sakamoto
Tomoko Ochi
Toshiaki Akashi
Kimihiko Kichikawa
Publikationsdatum: 01.11.2012
Verlag: Springer-Verlag
Erschienen in: Neuroradiology / Ausgabe 11/2012
Print ISSN: 0028-3940
Elektronische ISSN: 1432-1920
DOI: https://doi.org/10.1007/s00234-012-1029-5

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