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Welcome to the new AJNR, Updated Hall of Fame, and more. Read the full announcements.


AJNR is seeking candidates for the position of Associate Section Editor, AJNR Case Collection. Read the full announcement.

 

MY CONTENT

  • Spine
    You have access
    Unintended Consequences: Review of New Artifacts Introduced by Iterative Reconstruction CT Metal Artifact Reduction in Spine Imaging
    D.R. Wayer, N.Y. Kim, B.J. Otto, A.M. Grayev and A.D. Kuner
    American Journal of Neuroradiology November 2019, 40 (11) 1973-1975; DOI: https://doi.org/10.3174/ajnr.A6238
  • FELLOWS' JOURNAL CLUBPatient Safety
    Open Access
    Evaluation of Lower-Dose Spiral Head CT for Detection of Intracranial Findings Causing Neurologic Deficits
    J.G. Fletcher, D.R. DeLone, A.L. Kotsenas, N.G. Campeau, V.T. Lehman, L. Yu, S. Leng, D.R. Holmes, P.K. Edwards, M.P. Johnson, G.J. Michalak, R.E. Carter and C.H. McCollough
    American Journal of Neuroradiology November 2019, 40 (11) 1855-1863; DOI: https://doi.org/10.3174/ajnr.A6251

    Projection data from 83 patients undergoing unenhanced spiral head CT for suspected neurologic deficits were collected. A routine dose was obtained using 250 effective mAs and iterative reconstruction. Lower-dose configurations were reconstructed (25-effective mAs iterative reconstruction, 50-effective mAs filtered back-projection and iterative reconstruction, 100-effective mAs filtered back-projection and iterative reconstruction, 200-effective mAs filtered back-projection). Three neuroradiologists circled findings, indicating diagnosis, confidence, and image quality. The routine-dose jackknife alternative free-response receiver operating characteristic figure of merit was 0.87. Noninferiority was shown for 100-effective mAs iterative reconstruction and 200-effective mAs filtered back-projection, but not for100-effective mAs filtered back-projection. The authors conclude that substantial opportunity exists for dose reduction using spiral nonenhanced head CT and that the dose level might potentially be reduced to 40% of routine dose levels or a volume CT dose index of approximately 15mGy if slight decreases in performance are acceptable. The beneficial effect of iterative reconstrution was most pronounced at this 15-mGy dose level.

  • 35 Years Ago In Ajnr
    You have access
    Celebrating 35 Years of the AJNR
    American Journal of Neuroradiology November 2019, 40 (11) 1976; DOI: https://doi.org/10.3174/ajnr.P0084
  • Patient Safety
    You have access
    Dose Reduction While Preserving Diagnostic Quality in Head CT: Advancing the Application of Iterative Reconstruction Using a Live Animal Model
    F.D. Raslau, E.J. Escott, J. Smiley, C. Adams, D. Feigal, H. Ganesh, C. Wang and J. Zhang
    American Journal of Neuroradiology November 2019, 40 (11) 1864-1870; DOI: https://doi.org/10.3174/ajnr.A6258
  • Adult Brain
    Open Access
    Imaging G-Ratio in Multiple Sclerosis Using High-Gradient Diffusion MRI and Macromolecular Tissue Volume
    F. Yu, Q. Fan, Q. Tian, C. Ngamsombat, N. Machado, J.D. Bireley, A.W. Russo, A. Nummenmaa, T. Witzel, L.L. Wald, E.C. Klawiter and S.Y. Huang
    American Journal of Neuroradiology November 2019, 40 (11) 1871-1877; DOI: https://doi.org/10.3174/ajnr.A6283
  • EDITOR'S CHOICEAdult Brain
    Open Access
    Prolonged Microgravity Affects Human Brain Structure and Function
    D.R. Roberts, D. Asemani, P.J. Nietert, M.A. Eckert, D.C. Inglesby, J.J. Bloomberg, M.S. George and T.R. Brown
    American Journal of Neuroradiology November 2019, 40 (11) 1878-1885; DOI: https://doi.org/10.3174/ajnr.A6249

    Brain MR imaging scans of National Aeronautics and Space Administration astronauts were retrospectively analyzed to quantify pre- to postflight changes in brain structure. Local structural changes were assessed using the Jacobian determinant. Structural changes were compared with clinical findings and cognitive and motor function. Long-duration spaceflights aboard the International Space Station, but not short-duration Space Shuttle flights, resulted in a significant increase in the percentage of total ventricular volume change (10.7% versus 0%). The percentage of total ventricular volume change was significantly associated with mission duration but negatively associated with age. Pre- to postflight structural changes of the left caudate correlated significantly with poor postural control, and the right primary motor area/midcingulate correlated significantly with a complex motor task completion time. These findings suggest that brain structural changes are associated with changes in cognitive and motor test scores and with the development of spaceflight-associated neuro-optic syndrome.

  • Adult Brain
    Open Access
    Middle Cerebral Artery Plaque Hyperintensity on T2-Weighted Vessel Wall Imaging Is Associated with Ischemic Stroke
    Y.-N. Yu, M.-W. Liu, J.P. Villablanca, M.-L. Li, Y.-Y. Xu, S. Gao, F. Feng, D.S. Liebeskind, F. Scalzo and W.-H. Xu
    American Journal of Neuroradiology November 2019, 40 (11) 1886-1892; DOI: https://doi.org/10.3174/ajnr.A6260
  • You have access
    Perspectives
    Guido Guglielmi
    American Journal of Neuroradiology November 2019, 40 (11) 1791; DOI: https://doi.org/10.3174/ajnr.P0072
  • Adult Brain
    Open Access
    Bayesian Estimation of CBF Measured by DSC-MRI in Patients with Moyamoya Disease: Comparison with 15O-Gas PET and Singular Value Decomposition
    S. Hara, Y. Tanaka, S. Hayashi, M. Inaji, T. Maehara, M. Hori, S. Aoki, K. Ishii and T. Nariai
    American Journal of Neuroradiology November 2019, 40 (11) 1894-1900; DOI: https://doi.org/10.3174/ajnr.A6248
  • Pediatrics
    You have access
    Mixed Solid and Cystic Mass in an Infant
    J.C. Benson, D. Summerfield, J.B. Guerin, D. Kun Kim, L. Eckel, D.J. Daniels and P. Morris
    American Journal of Neuroradiology November 2019, 40 (11) 1792-1795; DOI: https://doi.org/10.3174/ajnr.A6226

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