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Silent susceptibility-weighted angiography to detect hemorrhagic lesions in the brain: a clinical and phantom study

  • Diagnostic Neuroradiology
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Abstract

Purpose

To compare the effectiveness of silent susceptibility-weighted angiography (sSWAN), a new imaging technique with lower acoustic noise, with conventional susceptibility-weighted angiography (cSWAN) in the detection of intracranial hemorrhagic lesions.

Methods

We measured the acoustic and background noise during sSWAN and cSWAN imaging and calculated the contrast-to-noise ratio (CNR) of the phantom consisting of eight chambers with different concentrations of superparamagnetic iron oxide. In the clinical study, we calculated the CNRs of hemorrhagic lesions in 15 patients and evaluated the images for conspicuity and artifact on each sequence and scored them on a 4-point scale. We also evaluated whether hypointense areas observed on sSWAN or cSWAN increased in size from those on T2*-weighted imaging (T2*-WI).

Results

Acoustic noise for sSWAN (57.9 ± 0.32 dB [background noise 51.3 dB]) was significantly less than that for cSWAN (89.0 ± 0.22 dB [background noise 50.9 dB]). The CNRs of phantoms for sSWAN were slightly but not significantly lower than those for cSWAN (P = 0.18). The CNRs of hemorrhagic lesions did not show significant differences between sSWAN and cSWAN (P = 0.17). There were no significant differences between sSWAN and cSWAN with respect to the scores for conspicuity, artifact, and change in size of hypointense areas from T2*-WI.

Conclusion

sSWAN is equivalent to cSWAN with respect to the image quality for the detection of hemorrhagic lesions but has lower acoustic noise.

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Authors and Affiliations

  1. Department of Diagnostic and Interventional Radiology, Osaka University Graduate School of Medicine, D1, 2-2, Yamadaoka, Suita, Osaka, 565-0871, Japan

    Takuya Fujiwara, Yoshiyuki Watanabe, Hisashi Tanaka, Hiroto Takahashi, Chisato Matsuo, Masahiro Fujiwara & Noriyuki Tomiyama

  2. GE Healthcare, MR Collaboration and Development, Tokyo, Japan

    Tetsuya Wakayama & Pauline Worters

  3. GE Global Research, Niskayuna, USA

    Christopher J. Hardy

Authors
  1. Takuya Fujiwara
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  2. Yoshiyuki Watanabe
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  3. Hisashi Tanaka
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  4. Hiroto Takahashi
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  5. Chisato Matsuo
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  6. Masahiro Fujiwara
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  7. Tetsuya Wakayama
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  8. Pauline Worters
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  9. Christopher J. Hardy
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  10. Noriyuki Tomiyama
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Corresponding author

Correspondence to Yoshiyuki Watanabe.

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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.

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Fujiwara, T., Watanabe, Y., Tanaka, H. et al. Silent susceptibility-weighted angiography to detect hemorrhagic lesions in the brain: a clinical and phantom study. Neuroradiology 62, 205–209 (2020). https://doi.org/10.1007/s00234-019-02296-9

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  • DOI: https://doi.org/10.1007/s00234-019-02296-9

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