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Index by author

February 01, 2020; Volume 41,Issue 2

  1. Obara, M.

    1. EDITOR'S CHOICEAdult Brain
      Spiral T1 Spin-Echo for Routine Postcontrast Brain MRI Exams: A Multicenter Multireader Clinical Evaluation
      M.B. Ooi, Z. Li, R.K. Robison, D. Wang, A.G. Anderson, N.R. Zwart, A. Bakhru, S. Nagaraj, T. Mathews, S. Hey, J.J. Koonen, I.E. Dimitrov, H.T. Friel, Q. Lu, M. Obara, I. Saha, H. Wang, Y. Wang, Y. Zhao, M. Temkit, H.H. Hu, T.L. Chenevert, O. Togao, J.A. Tkach, U.D. Nagaraj, M.C. Pinho, R.K. Gupta, J.E. Small, M.M. Kunst, J.P. Karis, J.B. Andre, J.H. Miller, N.K. Pinter and J.G. Pipe
      American Journal of Neuroradiology February 2020, 41 (2) 238-245; DOI: https://doi.org/10.3174/ajnr.A6409

      The authors report a multicenter multireader study that was designed to compare spiral with standard-of-care Cartesian postcontrast structural brain MR imaging on the basis of relative performance in 10 metrics of image quality, artifact prevalence, and diagnostic benefit. Seven clinical sites acquired 88 total subjects. For each subject, sites acquired 2 postcontrast MR imaging scans: a spiral 2D T1 spin-echo, and 1 of 4 routine Cartesian 2D T1 spin-echo/TSE scans. Nine neuroradiologists independently reviewed each subject, with the matching pair of spiral and Cartesian scans compared side-by-side, and scored the subject on 10 image-quality metrics. Spiral was superior to Cartesian in 7 of 10 metrics (flow artifact mitigation, SNR, GM/WM contrast, image sharpness, lesion conspicuity, preference for diagnosing abnormal enhancement, and overall intracranial image quality), comparable in 1 of 10 metrics (motion artifacts), and inferior in 2 of 10 metrics (susceptibility artifacts, overall extracranial image quality). Spiral 2D T1 spin-echo for routine structural brain MR imaging is feasible in the clinic with conventional scanners and was preferred by neuroradiologists for overall postcontrast intracranial evaluation.

  2. Oda, J.

    1. Adult Brain
      Visualization of Lenticulostriate Arteries on CT Angiography Using Ultra-High-Resolution CT Compared with Conventional-Detector CT
      K. Murayama, S. Suzuki, H. Nagata, J. Oda, I. Nakahara, K. Katada, K. Fujii and H. Toyama
      American Journal of Neuroradiology February 2020, 41 (2) 219-223; DOI: https://doi.org/10.3174/ajnr.A6377

  3. Oda, S.

    1. Adult Brain
      Metal Artifact Reduction in Head CT Performed for Patients with Deep Brain Stimulation Devices: Effectiveness of a Single-Energy Metal Artifact Reduction Algorithm
      Y. Nagayama, S. Tanoue, S. Oda, D. Sakabe, T. Emoto, M. Kidoh, H. Uetani, A. Sasao, T. Nakaura, O. Ikeda, K. Yamada and Y. Yamashita
      American Journal of Neuroradiology February 2020, 41 (2) 231-237; DOI: https://doi.org/10.3174/ajnr.A6375

  4. Ooi, M.B.

    1. EDITOR'S CHOICEAdult Brain
      Spiral T1 Spin-Echo for Routine Postcontrast Brain MRI Exams: A Multicenter Multireader Clinical Evaluation
      M.B. Ooi, Z. Li, R.K. Robison, D. Wang, A.G. Anderson, N.R. Zwart, A. Bakhru, S. Nagaraj, T. Mathews, S. Hey, J.J. Koonen, I.E. Dimitrov, H.T. Friel, Q. Lu, M. Obara, I. Saha, H. Wang, Y. Wang, Y. Zhao, M. Temkit, H.H. Hu, T.L. Chenevert, O. Togao, J.A. Tkach, U.D. Nagaraj, M.C. Pinho, R.K. Gupta, J.E. Small, M.M. Kunst, J.P. Karis, J.B. Andre, J.H. Miller, N.K. Pinter and J.G. Pipe
      American Journal of Neuroradiology February 2020, 41 (2) 238-245; DOI: https://doi.org/10.3174/ajnr.A6409

      The authors report a multicenter multireader study that was designed to compare spiral with standard-of-care Cartesian postcontrast structural brain MR imaging on the basis of relative performance in 10 metrics of image quality, artifact prevalence, and diagnostic benefit. Seven clinical sites acquired 88 total subjects. For each subject, sites acquired 2 postcontrast MR imaging scans: a spiral 2D T1 spin-echo, and 1 of 4 routine Cartesian 2D T1 spin-echo/TSE scans. Nine neuroradiologists independently reviewed each subject, with the matching pair of spiral and Cartesian scans compared side-by-side, and scored the subject on 10 image-quality metrics. Spiral was superior to Cartesian in 7 of 10 metrics (flow artifact mitigation, SNR, GM/WM contrast, image sharpness, lesion conspicuity, preference for diagnosing abnormal enhancement, and overall intracranial image quality), comparable in 1 of 10 metrics (motion artifacts), and inferior in 2 of 10 metrics (susceptibility artifacts, overall extracranial image quality). Spiral 2D T1 spin-echo for routine structural brain MR imaging is feasible in the clinic with conventional scanners and was preferred by neuroradiologists for overall postcontrast intracranial evaluation.

  5. Orlowski, H.

    1. FELLOWS' JOURNAL CLUBSpine
      Renal Excretion of Contrast on CT Myelography: A Specific Marker of CSF Leak
      S. Behbahani, J. Raseman, H. Orlowski, A. Sharma and R. Eldaya
      American Journal of Neuroradiology February 2020, 41 (2) 351-356; DOI: https://doi.org/10.3174/ajnr.A6393

      The authors performed a retrospective review of postmyelographic CT scans from 49 consecutive patients seen between January 2009 and August 2018 with imaging and/or clinical findings related to intracranial hypotension. Each scan was evaluated by both a neuroradiology fellow and a board-certified neuroradiologist for the presence of contrast in the renal excretory system. A similar assessment was also performed on 90 consecutive control subjects who underwent CT myelography for alternative indications. Among the 49 patients with suspected CSF leak, 21 (43%) had an overt CSF leak on postmyelographic CT (group 1) and 28 (57%) did not (group 2). Overall, renal contrast was identified in 7/49 patients (14.3%): 5 (24%) patients in group 1, and 2 (7%) patients in group 2. Renal contrast was not seen in any of the 90 controls on postmyelographic CT. Renal contrast was exclusively seen in patients with a clinically or radiographically suspected CSF leak. Identification of this finding should prompt a second look for subtle myelographic contrast extravasation or an underlying CSF-venous fistula.

  6. Ospel, J.M.

    1. Practice Perspectives
      Open Access
      Displaying Multiphase CT Angiography Using a Time-Variant Color Map: Practical Considerations and Potential Applications in Patients with Acute Stroke
      J.M. Ospel, O. Volny, W. Qiu, M. Najm, N. Kashani, M. Goyal and B.K. Menon
      American Journal of Neuroradiology February 2020, 41 (2) 200-205; DOI: https://doi.org/10.3174/ajnr.A6376
    2. Interventional
      How Do Physicians Approach Intravenous Alteplase Treatment in Patients with Acute Ischemic Stroke Who Are Eligible for Intravenous Alteplase and Endovascular Therapy? Insights from UNMASK-EVT
      J.M. Ospel, N. Kashani, U. Fischer, B.K. Menon, M. Almekhlafi, A.T. Wilson, M.M. Foss, G. Saposnik, M. Goyal and M.D. Hill
      American Journal of Neuroradiology February 2020, 41 (2) 262-267; DOI: https://doi.org/10.3174/ajnr.A6396
    3. Interventional
      Endovascular Treatment Decisions in Patients with M2 Segment MCA Occlusions
      M. Almekhlafi, J.M. Ospel, G. Saposnik, N. Kashani, A. Demchuk, M.D. Hill, M. Goyal and B.K. Menon
      American Journal of Neuroradiology February 2020, 41 (2) 280-285; DOI: https://doi.org/10.3174/ajnr.A6397
    4. Clinical Report
      Intra-Arterial Verapamil Treatment in Oral Therapy–Refractory Reversible Cerebral Vasoconstriction Syndrome
      J.M. Ospel, C.H. Wright, R. Jung, L.L.M. Vidal, S. Manjila, G. Singh, D.V. Heck, A. Ray and K.A. Blackham
      American Journal of Neuroradiology February 2020, 41 (2) 293-299; DOI: https://doi.org/10.3174/ajnr.A6378

  7. Otani, K.

    1. FELLOWS' JOURNAL CLUBInterventional
      Delayed Leukoencephalopathy: A Rare Complication after Coiling of Cerebral Aneurysms
      A. Ikemura, T. Ishibashi, K. Otani, I. Yuki, T. Kodama, I. Kan, N. Kato and Y. Murayama
      American Journal of Neuroradiology February 2020, 41 (2) 286-292; DOI: https://doi.org/10.3174/ajnr.A6386

      Delayed leukoencephalopathy is a rare complication that occurs after endovascular coiling of cerebral aneurysms and is found in the literature with several different names, such as delayed leukoencephalopathy, delayed enhancing lesions, and delayed multiple white matter lesions. Its various suggested etiologies include granulation reaction caused by foreign body emboli from the hydrophilic coating of procedural devices, contrast-induced encephalopathy, and nickel or bioactive polyglycolic/polylactic acid coil sensitivity. The authors analyzed 1754 endovascular coiling procedures of 1594 aneurysms. Sixteen procedures demonstrated delayed leukoencephalopathy on follow-up FLAIR MR imaging examinations after a median period of 71.5 days in the form of high-signal changes in the white matter at locations remote from the coil mass. Seven patients had headaches or hemiparesis, and 9 patients were asymptomatic. All imaging-associated changes improved subsequently. They found evidence of an association between delayed leukoencephalopathy and the number of microcatheters used per procedure, along with evidence suggesting that these procedures required larger median volumes of contrast medium and weak evidence regarding the need for a longer median fluoroscopy duration.

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