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Index by author

March 01, 2020; Volume 41,Issue 3

  1. So, T.Y.

    1. EDITOR'S CHOICEHead & Neck
      Open Access
      Early Detection of Cancer: Evaluation of MR Imaging Grading Systems in Patients with Suspected Nasopharyngeal Carcinoma
      A.D. King, J.K.S. Woo, Q.-Y. Ai, F.K.F. Mo, T.Y. So, W.K.J. Lam, I.O.L. Tse, A.C. Vlantis, K.W.N. Yip, E.P. Hui, B.B.Y. Ma, R.W.K. Chiu, A.T.C. Chan, Y.M.D. Lo and K.C.A. Chan
      American Journal of Neuroradiology March 2020, 41 (3) 515-521; DOI: https://doi.org/10.3174/ajnr.A6444

      Dedicated nasopharyngeal MR imaging before (plain scan system) and after intravenous contrast administration (current and modified systems) was reviewed in patients from a nasopharyngeal carcinoma-endemic region, comprising 383 patients with suspected disease without nasopharyngeal carcinoma and 383 patients with nasopharyngeal carcinoma. The modified and plain scan systems refined primary tumor criteria, added a nodal assessment, and expanded the system from 4 to 5 grades. The current, modified, and plain scan MR imaging systems yielded sensitivities of 99.74%, 97.91%, and 97.65%, respectively, and specificities of 63.45%, 89.56%, and 86.42%, respectively. The modified system yielded significantly better performance than the current and plain systems. In conclusion, the authors propose a modified MR imaging grading system that improves diagnostic performance for nasopharyngeal carcinoma detection. Contrast was not valuable for low MR imaging grades, and the plain scan shows potential for use in screening programs.

  2. Soloff, E.

    1. Spine
      Lumbar Puncture: Creation and Resident Acceptance of a Low-Cost, Durable, Reusable Fluoroscopic Phantom with a Fluid-Filled Spinal Canal for Training at an Academic Program
      D.J. Lerner, S.E. Gifford, N. Olafsen, A. Mileto and E. Soloff
      American Journal of Neuroradiology March 2020, 41 (3) 548-550; DOI: https://doi.org/10.3174/ajnr.A6439

  3. Sommer, K.

    1. FELLOWS' JOURNAL CLUBAdult Brain
      Correction of Motion Artifacts Using a Multiscale Fully Convolutional Neural Network
      K. Sommer, A. Saalbach, T. Brosch, C. Hall, N.M. Cross and J.B. Andre
      American Journal of Neuroradiology March 2020, 41 (3) 416-423; DOI: https://doi.org/10.3174/ajnr.A6436

      The authors implement and validate an MRI motion-artifact correction method using a multiscale fully convolutional neural network. Application of the network resulted in notably improved image quality without the loss of morphologic information. For synthetic test data, the average reduction in mean squared error was 41.84%. The blinded reader study on the real-world test data resulted in significant reduction in mean artifact scores across all cases.

  4. Sprenger, T.

    1. Adult Brain
      Open Access
      Clinical Experience of 1-Minute Brain MRI Using a Multicontrast EPI Sequence in a Different Scan Environment
      K.H. Ryu, H.J. Baek, S. Skare, J.I. Moon, B.H. Choi, S.E. Park, J.Y. Ha, T.B. Kim, M.J. Hwang and T. Sprenger
      American Journal of Neuroradiology March 2020, 41 (3) 424-429; DOI: https://doi.org/10.3174/ajnr.A6427

  5. Stein, A.A.

    1. Interventional
      Access-Site Complications in Mechanical Thrombectomy for Acute Ischemic Stroke: A Review of Prospective Trials
      S.Z. Shapiro, K.A. Sabacinski, K. Mantripragada, S.S. Shah, A.A. Stein, N.B. Echeverry, G.A. MacKinnon and B.M. Snelling
      American Journal of Neuroradiology March 2020, 41 (3) 477-481; DOI: https://doi.org/10.3174/ajnr.A6423

  6. Stokes, A.M.

    1. EDITOR'S CHOICEAdult Brain
      Open Access
      Performance of Standardized Relative CBV for Quantifying Regional Histologic Tumor Burden in Recurrent High-Grade Glioma: Comparison against Normalized Relative CBV Using Image-Localized Stereotactic Biopsies
      J.M. Hoxworth, J.M. Eschbacher, A.C. Gonzales, K.W. Singleton, G.D. Leon, K.A. Smith, A.M. Stokes, Y. Zhou, G.L. Mazza, A.B. Porter, M.M. Mrugala, R.S. Zimmerman, B.R. Bendok, D.P. Patra, C. Krishna, J.L. Boxerman, L.C. Baxter, K.R. Swanson, C.C. Quarles, K.M. Schmainda and L.S. Hu
      American Journal of Neuroradiology March 2020, 41 (3) 408-415; DOI: https://doi.org/10.3174/ajnr.A6486

      This study compares the predictive performance of relative CBV standardization against relative CBV normalization for quantifying recurrent tumor burden in high-grade gliomas relative to posttreatment radiation effects. The authors recruited 38 previously treated patients with high-grade gliomas (World Health Organization grades III or IV) undergoing surgical re-resection for recurrent tumor versus posttreatment radiation effects. They recovered 112 image-localized biopsies and quantified the percentage of histologic tumor content versus posttreatment radiation effects for each sample. They measured spatially matched normalized and standardized relative CBV metrics (mean, median) and fractional tumor burden for each biopsy. Across relative CBV metrics, fractional tumor burden showed the highest correlations with tumor content (0%–100%) for normalized and standardized values. With binary cutoffs, predictive accuracies were similar for both standardized and normalized metrics and across relative CBV metrics. Standardization of relative CBV achieves similar equivalent performance compared with normalized relative CBV and offers an important step toward workflow optimization and consensus methodology.

  7. Su, T.

    1. Interventional
      Open Access
      Large Neck and Strong Ostium Inflow as the Potential Causes for Delayed Occlusion of Unruptured Sidewall Intracranial Aneurysms Treated by Flow Diverter
      T. Su, P. Reymond, O. Brina, P. Bouillot, P. Machi, B.M.A. Delattre, L. Jin, K.O. Lövblad and M.I. Vargas
      American Journal of Neuroradiology March 2020, 41 (3) 488-494; DOI: https://doi.org/10.3174/ajnr.A6413

  8. Swanson, K.R.

    1. EDITOR'S CHOICEAdult Brain
      Open Access
      Performance of Standardized Relative CBV for Quantifying Regional Histologic Tumor Burden in Recurrent High-Grade Glioma: Comparison against Normalized Relative CBV Using Image-Localized Stereotactic Biopsies
      J.M. Hoxworth, J.M. Eschbacher, A.C. Gonzales, K.W. Singleton, G.D. Leon, K.A. Smith, A.M. Stokes, Y. Zhou, G.L. Mazza, A.B. Porter, M.M. Mrugala, R.S. Zimmerman, B.R. Bendok, D.P. Patra, C. Krishna, J.L. Boxerman, L.C. Baxter, K.R. Swanson, C.C. Quarles, K.M. Schmainda and L.S. Hu
      American Journal of Neuroradiology March 2020, 41 (3) 408-415; DOI: https://doi.org/10.3174/ajnr.A6486

      This study compares the predictive performance of relative CBV standardization against relative CBV normalization for quantifying recurrent tumor burden in high-grade gliomas relative to posttreatment radiation effects. The authors recruited 38 previously treated patients with high-grade gliomas (World Health Organization grades III or IV) undergoing surgical re-resection for recurrent tumor versus posttreatment radiation effects. They recovered 112 image-localized biopsies and quantified the percentage of histologic tumor content versus posttreatment radiation effects for each sample. They measured spatially matched normalized and standardized relative CBV metrics (mean, median) and fractional tumor burden for each biopsy. Across relative CBV metrics, fractional tumor burden showed the highest correlations with tumor content (0%–100%) for normalized and standardized values. With binary cutoffs, predictive accuracies were similar for both standardized and normalized metrics and across relative CBV metrics. Standardization of relative CBV achieves similar equivalent performance compared with normalized relative CBV and offers an important step toward workflow optimization and consensus methodology.

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