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Index by author

December 01, 2017; Volume 38,Issue 12

  1. Ulzheimer, S.

    1. EDITOR'S CHOICEAdult Brain
      Open Access
      Photon-Counting CT of the Brain: In Vivo Human Results and Image-Quality Assessment
      A. Pourmorteza, R. Symons, D.S. Reich, M. Bagheri, T.E. Cork, S. Kappler, S. Ulzheimer and D.A. Bluemke
      American Journal of Neuroradiology December 2017, 38 (12) 2257-2263; DOI: https://doi.org/10.3174/ajnr.A5402

      Radiation dose–matched energy-integrating detector and photon-counting detector head CT scans were acquired with standardized protocols (tube voltage/current, 120 kV(peak)/370 mAs) in both an anthropomorphic head phantom and 21 asymptomatic volunteers. Image noise, gray matter, and white matter signal-to-noise ratios and GM–WM contrast and contrast-to-noise ratios were measured. Image quality was scored by 2 neuroradiologists blinded to the CT detector type. Photon-counting detector brain CT scans demonstrated greater gray–white matter contrast compared with conventional CT. This was due to both higher soft-tissue contrast and lower image noise for photon-counting CT.

  2. Uwano, I.

    1. EDITOR'S CHOICEExtracranial Vascular
      Open Access
      Preoperative Cerebral Oxygen Extraction Fraction Imaging Generated from 7T MR Quantitative Susceptibility Mapping Predicts Development of Cerebral Hyperperfusion following Carotid Endarterectomy
      J.-i. Nomura, I. Uwano, M. Sasaki, K. Kudo, F. Yamashita, K. Ito, S. Fujiwara, M. Kobayashi and K. Ogasawara
      American Journal of Neuroradiology December 2017, 38 (12) 2327-2333; DOI: https://doi.org/10.3174/ajnr.A5390

      Seventy-seven patients with unilateral internal carotid artery stenosis underwent preoperative 3DT2*-weighted imaging using a multiple dipole-inversion algorithm with a 7T MR scanner. Quantitative susceptibility mapping images wereobtained, and oxygen extraction fraction maps were generated. Quantitative brain perfusion single-photon emission CT was alsoperformed before and immediately after carotid endarterectomy. Ten patients (13%) showed post–carotid endarterectomy hyperperfusion. Multivariate analysis showed that a high quantitative susceptibility mapping–oxygen extraction fraction ratio was significantly associated with the development of post–carotid endarterectomy hyperperfusion.

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